JP2554969B2 - Soil investigation method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention measures the soil resistance before and after the improvement in the injection of a chemical solution into the ground by measuring the electric resistance in addition to the strength and / or the hydraulic conductivity in the ground through the same measuring hole. The present invention relates to a soil investigation method and device for confirming the ground improvement effect.

[0002]

2. Description of the Related Art It is very difficult to confirm the effect of ground improvement because it is to evaluate the effect of the improved body constructed in the ground, and various methods have been conventionally considered.
The method using electric resistance (specific resistance) is one of them, and the improvement range can be determined by this method. But,
It is not possible to understand to what extent the improved region has physical engineering properties by measuring electrical resistance (specific resistance) alone.
That is, the resistance (specific resistance) is measured by measuring the electric resistance (specific resistance).
A distribution map is obtained depending on the difference in the electric resistance (specific resistance) of the improved solidified body due to the difference in the filling ratio of the chemical solution into the pores of the soil particles. If the difference in specific resistance is expressed by physical property values in soil engineering, it is not possible to know what it will be like.

Further, various in-situ tests for measuring the strength or water permeability in the ground have been conventionally known. However, these are independent technologies, and many tests cannot be carried out at many places, so it is very dangerous to evaluate a large area of the ground improvement solidified body with a test value of several points. That is, in these tests, the improvement of the measurement point can only be locally known, and the improvement effect of the entire improved ground cannot be known. If the reliability of the evaluation is to be increased, many test holes must be made.

[0004]

Problems to be Solved by the Invention When confirming the improvement effect by chemical injection, the biggest problem is that the strength characteristics and water stopping property of the entire injection region cannot be grasped. That is, the injection of the chemical solution is carried out before the excavation work or the foundation work to increase the strength and improve the water blocking property within a predetermined range. And in this improvement, the predetermined range
For example, injection is performed through many injection holes at intervals of about 1 m. Therefore, if the solidification property or the water stopping property is insufficient in a part, destruction or spring water occurs from that part, and the whole is collapsed. For this reason, it is necessary to grasp the solidification property of the entire injection region and the distribution state of the water blocking property.

However, in the conventional test methods, regarding the strength, a penetration test, a horizontal loading test, and a waterproof test such as a water permeation test can be confirmed, but the overall effect cannot be grasped. . On the other hand, in the electric resistance method, it is possible to know the specific resistance distribution of the entire range by arranging the electrodes at intervals, and therefore it is useful for estimating the permeation state of the infusate, but the numerical value itself. Has a drawback in that it cannot directly show strength and water-stopping property, and it has been practically not used even if it is used experimentally. If the specific resistance measurement,
If the horizontal loading test and the water permeability test are performed by separate measuring tubes, the error in correspondence between these measured values becomes extremely large, and it is impossible to accurately convert to the strength characteristic distribution or the water permeability characteristic distribution.

Therefore, an object of the present invention is to determine the range of ground improvement by electric resistance (specific resistance) and to carry out a horizontal load test device,
It is an object of the present invention to provide a soil investigation method and apparatus capable of measuring the strength and permeability of the improved ground by means of a water permeation test apparatus according to any improvement depth with the same measurement hole and measuring pipe. In particular, the object of the present invention is to grasp the penetration state of the chemical solution into the pores of the soil particles by measuring the electric resistance (specific resistance), and at the same time, the strength and water permeability of the measured range can be measured at several locations in the depth direction with the same measuring tube. It is to provide a soil investigation method and device that can be verified. Further, the object of the present invention is to evaluate the electric resistance (specific resistance) value and the strength and water permeability coefficient values obtained from the horizontal loading test and / or the water permeation test in correspondence with each other, thereby evaluating You can determine the relevance of each measurement and, as a result,
It becomes possible to convert the specific resistance distribution of the entire injection area obtained by the electric resistance (specific resistance) test into the strength distribution and the water stop distribution, and the strength and hydraulic conductivity are evaluated in the large area of the improved solidified body. The purpose of the present invention is to provide a soil investigation method and device that can be used.

[0007]

In order to achieve the above object, according to the soil investigation method of the present invention, a measuring tube equipped with a horizontal loading test member and / or a water permeation test member and an electrode is provided. It is buried in the ground to be subjected to soil investigation, and the horizontal loading test member has the same strength in the ground, and / or the water permeation test member has the same permeability coefficient in the ground, and the electrodes have the same electric resistance value of the ground. The feature is that the soil improvement situation is known by measuring the soil using the measurement hole of the above and investigating the soil quality before and after the chemical solution injection.

Further, in order to achieve the above-mentioned object, according to the soil investigation apparatus of the present invention, it comprises a measuring pipe buried in the ground to be subjected to the soil investigation, and this measuring pipe is bored in the pipe wall. A horizontal loading test member composed of a discharge port and an elastic bag covering the discharge port, and / or a discharge port formed in the wall of the measuring pipe, and a rubber sleeve covering the discharge port. A water permeation test member consisting of
Further, an electrode is installed on the measuring tube, and the electrode is connected to an electric resistance measuring device arranged on the ground.

[0009]

The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a sectional view of a specific example of the device according to the present invention. First, the device of the present invention shown in FIG. 1 will be described.
Is a measuring tube, which is composed of an inner tube 2 and an outer tube 3,
The ground 5 to be soil-examined is drilled by the metal crown 4 provided at the tip of the outer pipe 3 to be embedded in the ground 5 while forming the measurement hole 6. A horizontal loading test member 7 and a water permeation / permeability test member 8 are installed below the member 7, especially in the inner pipe 2 of the measuring pipe 1, and a plurality of, for example, a pair of electrodes 9, 9 are arranged in the longitudinal direction. It is installed at a position apart from each other, for example, above and below the member 7. Inner tube 2
The water conduit 2 leading to the water permeation test member 8 in the pipeline 2a
b is installed. Either one of the horizontal load test member 7 and the water permeation test member 8 may be installed, or both of them may be installed.

The horizontal loading test member 7 is composed of a discharge port A10 formed in the wall of the measuring pipe 1, particularly the inner pipe 2, and a stretchable bag 11 covering the discharge port A10. Reference numeral 8 is composed of a discharge port B12 formed in the wall of the measuring pipe 1, particularly the inner pipe 2, and a rubber sleeve 13 covering the discharge port B12. The pair of electrodes 9, 9 are connected to an electric resistance measuring device 14 arranged on the ground. As shown in FIG. 1, the horizontal loading test member 7, the water permeation test member 8 and the pair of electrodes 9 and 9 are outside the measuring pipe (double pipe) 1 when the outer pipe 3 is pulled upward. It is installed in the inner tube 2 so as to be exposed to. 15 is a packer.

The apparatus of the present invention of FIG. 1 having the above-mentioned configuration is used for soil investigation as follows. First, the measuring pipe 1 is embedded in the ground 5 to be subjected to soil investigation. This burial is as described above
As described above, the measurement is performed while the measurement hole 6 is drilled by the metal crown 4. Then, the outer tube 3 is pulled upward to pull the horizontal loading test member 7, the water permeation test member 8 and the pair of electrodes 9,
9 are exposed to the outside of the double tube (measurement tube) 1, respectively.
Further, water was pressed into elastic bag 11 via line 2a and the discharge port A 10 of the inner tube 2, the elastic bag 11 is expanded against the hole wall 6a in which the first measuring the ground strength. Further, the expanded elastic bag 11 is used as a packer through the water conduit 2b and the discharge port B12, the rubber sleeve 13 is pushed open to inject water into the ground, and the hydraulic conductivity of the ground is measured from the injected amount. Furthermore, a pair of electrodes 9,
The specific resistance value of the ground 5 between 9 is measured by the electric resistance measuring device 14.

Next, the device of the present invention shown in FIG. 2 will be described. The measuring tube 1 in FIG. 2 also has an inner tube 2 and an outer tube 3.
In the same manner as in FIG. 1, while forming a measurement hole 6 by boring a ground 5 to be subjected to soil investigation by a metal crown 4 (not shown) at the tip of the outer pipe 3, the inside of the ground 5 is formed. Buried in. A plurality of horizontal load test members 7 are installed on the outer pipe 3 of the measuring pipe 1 at desired intervals, and a water permeation test member is placed at the position of the outer pipe 3 between these horizontal load test members 7, 7. 8 are installed, and a plurality of electrodes, for example, a pair of electrodes 9, 9 are respectively installed at positions apart from each other in the longitudinal direction of the outer tube 3, for example, positions of the outer tube 3 above and below the horizontal loading test member 7.

Further, the upper packer 1 is provided on the tube wall of the inner tube 2.
6, a plurality of intermediate packers 17 below the lower packer 18 and a plurality of lower packers 18 below the intermediate packer 17 are installed at intervals so as to partition the outer pipe line 3a. Further, a hole 19 is formed in the wall of the inner pipe 2 between the upper packer 16 and the intermediate packer 17.
And the outer pipe line 3a above the upper packer 16, the intermediate packer 17 and the lower packer 18
The outer pipe line 3a sandwiched between the two is communicated via a bypass pipe 20.

The horizontal loading test member 7 is composed of a discharge port A10 formed in the wall of the outer tube 3 and an elastic bag 11 covering the discharge port A10, and the water permeation test member 8 is a tube of the outer tube 3. The discharge port B12 is formed in the wall, and the rubber sleeve 13 covers the discharge port B12. The apparatus of FIG. 2 differs from that of FIG. 1 in that the outlet A10, the outlet B12, the elastic bag 11 and the rubber sleeve 13 are provided on the outer tube 3, respectively. Further, the pair of electrodes 9, 9 are connected to an electric resistance measuring device 14 (not shown) arranged on the ground, respectively, as in FIG.

The apparatus of the present invention of FIG. 2 having the above-mentioned configuration is used for soil investigation as follows. First, as in FIG. 1, the measuring pipe 1 is embedded in the ground 5 to be subjected to soil investigation. This burying is performed while drilling the measurement hole 6 with the metal crown 4 (not shown) as in FIG. Then, as shown in FIG. 3, the inner tube 2 is slid upward to form the hole 19 in the inner tube 2.
On one of the top and bottom adjacent to the outer wall of the outer tube 3,
For example, in accordance with the discharge port A10 of the upper horizontal loading test member 7, water is press-fitted into the elastic bag 11 from the inner pipe line 2a through the hole 19 and the discharge port A10 in the direction of the arrow so that the elastic bag 1
Ground strength is measured by expanding 1 and pressing the hole wall 6a.

Further, as shown in FIG. 4, the inner tube 2 is slid downward so that the hole 19 in the tube wall of the inner tube 2 is aligned with the discharge port A10 of the lower horizontal loading test member 7, and the same as above. And measure the ground strength. Further, by sliding the inner pipe 2 upward , a hole 19 in the pipe wall of the inner pipe 2 as shown in FIG. 2 is formed in the discharge wall B12 of the outer pipe 3 of the water permeation test member 8. To match.

Then, water is press-fitted into the upper elastic bag 11 through the outer pipe line 3a and water is press-fitted into the lower elastic bag 11 through the bypass pipe 20, and these expanded upper and lower elastic bags 11, With 11 as a packer, the rubber sleeve 13 is pushed open from the inner pipe line 2a through the hole 19 and the discharge port B12, water is injected into the ground, and the water permeability of the ground is measured from the injected amount. Furthermore, the specific resistance value of the ground between the upper and lower electrodes 9, 9 is measured by an electric resistance measuring device (not shown).
The parts of the outer pipe line 3a sandwiched by the packers 16, 17, and 18 are sealed by these packers, respectively, so that the stretchable bag 11 passes from the inner pipe 2 through the hole 19 and the discharge port A10.
A sealed passage is formed up to and the water is pressed into the elastic bag 11 without leaking.

FIG. 5 is a sectional view of still another embodiment of the device of the present invention. Hereinafter, the device of the present invention shown in FIG. 5 will be described. The measuring tube 1 in FIG. 5 also has an inner tube 2 and an outer tube 3.
1 and is buried in the ground 5 while forming a measurement hole 6 by boring the ground 5 to be subjected to soil investigation by the metal crown 4 at the tip of the outer tube 3 as in FIG. A plurality of horizontal loading test members 7 are provided on the outer pipe 3 of the measuring pipe 1,
The water-permeable and water-permeable test member 8 is installed at a desired interval, and at the position of the outer pipe 3 between these horizontal load test members 7, 7.
And a plurality of electrodes, for example, a pair of electrodes 9, 9 are respectively installed at positions apart from each other in the longitudinal direction of the outer tube 3, for example, positions of the upper and lower outer tubes 3 of the horizontal loading test member 7.

The horizontal loading test member 7 is composed of a discharge port A10 formed in the wall of the outer tube 3 and an elastic bag 11 covering the discharge port A10, and the water permeation test member 8 is the tube of the outer tube 3. The discharge port B12 is formed in the wall, and the rubber sleeve 13 covers the discharge port B12. The apparatus of FIG. 5 differs from that of FIG. 1 in that the discharge port A10, the discharge port B12, the elastic bag 11 and the rubber sleeve 13 are provided on the outer tube 3, respectively. Further, the pair of electrodes 9, 9 are connected to the electric resistance measuring device 14 arranged on the ground, respectively, as in FIG.

FIG. 6 is a view showing the inner pipe 2 of FIG. 5, FIG. 6 (a) is a plan view of the inner pipe 2, and FIG. 6 (b) is FIG.
6A is a sectional view taken along line AA in FIG. 6A, and FIG. 6C is B in FIG.
-B line sectional drawing, FIG.6 (d) is CC sectional view taken on the line of FIG.6 (a).

As shown in FIG. 6, on the tube wall of the inner tube 2,
Upper horizontal load test members 7 adjacent to each other in FIG.
A packer hole 21 is formed at a position corresponding to. This hole
21 is covered by a rubber sleeve 22 to prevent backflow.
Further, a horizontal loading test hole 23 and a packer hole 24 are formed at positions corresponding to the lower horizontal loading test member 7 adjacent thereto. The packer hole 24 is covered with the rubber sleeve 25 as described above. Further, as shown in FIGS. 5 and 6, the inner pipes 2 above and below the packer hole 21 on the upper side.
Packers 30 and 31 are provided on the pipe wall of the packer, and packers 3 and 31 are provided above and below the horizontal loading test hole 23 and the packer hole 24, respectively.
2, 33 are formed so as to partition the outer pipe line 3a.

Further, the water permeation test member 8 in FIG.
The hole for water permeation test 26 on the tube wall of the inner tube 2 of FIG.
Is drilled. The horizontal loading test hole 23, the packer holes 21 and 24, and the water permeation test hole 26 are formed separately in the inner pipe line 2a.
7. Connected to the packer passage 28 and the water injection / permeability test passage 29.

The apparatus of the present invention of FIG. 5 having the above-mentioned configuration is used for soil investigation as follows. First, similar to FIG. 1, the measuring pipe 1 is buried in the ground 5 to be subjected to soil investigation. This burying is performed while drilling the measurement hole 6 with the metal crown 4 as in FIG. Then, as shown in FIG.
The horizontal loading test hole 23 is slid to form the discharge port A10 of the upper horizontal loading test member 7 formed in the tube wall of the outer tube 3.
Then, water is press-fitted into the elastic bag 11 from the horizontal loading test passage 27 through the hole 23 and the discharge port A10.
Ground strength is measured by expanding 11 and pressing the hole wall 6a.

Further, as shown in FIG. 8, the inner pipe 2 is slid downward so that the horizontal loading test hole 23 is formed in the outer pipe 3.
The ground strength is measured in the same manner as described above by aligning it with the discharge port A10 of the lower horizontal loading test member 7 drilled in the pipe wall.
Further, as shown in FIG. 5, water is press-fitted into the upper and lower elastic bags 11 and 11 from the packer passage 28 through the upper and lower packer holes 21 and 24 and the discharge ports A10 and 10, respectively, and these expanded upper and lower bags Using the elastic bags 11 and 11 as packers from the passage 29 for water penetration test to the water penetration hole 26 and outer tube 3
The rubber sleeve 13 is pushed open through the discharge port B12 of the water permeation test member 8 bored in the pipe wall of No. 2 to inject water into the ground, and the water permeability coefficient of the ground is measured from the injected amount. further,
The electrical resistance measuring device 14 measures the specific resistance value of the ground between the upper and lower electrodes 9, 9.

In the present invention, as shown in FIG.
The electrode tube 34 may be embedded in parallel with the measuring tube 1 in the ground 5 in the vicinity of the measuring tube 1 according to FIGS. 1, 2 and 5.
The electrode tube 34 is constructed by arranging the electrodes 35, 35, ... 35 at desired intervals in the vertical direction, and the electrodes 9, 9 ,.
The specific resistance value of the ground 5 between the electrode 9 and the electrodes 35, 35 ... 35 of the electrode tube 34 is measured by the electric resistance measuring device 14.

The ground strength is measured by measuring the reaction coefficient K of the ground by expanding the elastic bag 11 and pressing the hole wall 6a. The reaction force coefficient K of the ground is represented by the ratio dp / dr of the change in the radial direction to the change in the stress according to the principle of the plesiometer,

[Equation 1] dp / dr = E / (l + μ) r = K dp: Change in stress (pressure) (kg / cm ² ) dr: Incremental change in radial direction (cm) E: Deformation coefficient (kg / cm ²⁾ ) μ: Poisson's ratio r: The elastic modulus E of the ground can be obtained from the relation of the radius (cm) of the boring hole.

Further, a fixed amount of water is injected into the ground through the discharge port B12, and the water permeability coefficient k is measured from the injected amount. This water permeability k is obtained by injecting water of a constant pressure into the space below the elastic bag 11 which is blocked by the elastic bag 11 as a packer.
Measure until the injection amount per unit time becomes constant,

[Equation 2] k = (2.3Q / 2π1H) · log (l / r) 1> 10r k = (Q / 2π1H) · sin ⁻¹ (1 / 2r) 10r> 1 ≧ r k: coefficient of permeability (cm) / sec) Q: Unit time injection amount (cm ³ / sec) l: Permeability section length (cm) r: Boring hole radius (cm) H: Permeability coefficient k of the ground from the relationship of head of injection pressure (cm) Desired.

A resistance (specific resistance) vertical exploration measurement is performed according to the depth of the measurement hole 6 by means of the ground-based electric resistance measuring device 14 connected to the pair of electrodes 9 and 9 described above. The cross-sectional view shows the improvement range of a given cross-section.

[0029]

According to the present invention, the electric resistance (specific resistance) measuring portion and the horizontal loading test portion and / or the water permeation / permeability testing portion are installed in the same measuring pipe, so that the same measurement hole can improve the ground. It is possible to make a comprehensive evaluation of the exploration physical quantity and the physical property value in soil engineering, and it is possible to reduce the number of drilling holes.

[Brief description of drawings]

FIG. 1 is a sectional view of a specific example of the device of the present invention.

FIG. 2 is a sectional view of another specific example of the device of the present invention.

FIG. 3 is a cross-sectional view showing an operation process of the apparatus of FIG.

FIG. 4 is a cross-sectional view showing another operation step of the device of FIG.

FIG. 5 is a sectional view of another embodiment of the device according to the present invention.

6 is a drawing showing an inner tube of the apparatus of FIG.
(A) is a plan view of the inner pipe, (b) is a sectional view taken along line AA, (c).
Is a cross-sectional view taken along the line BB, and (d) is a cross-sectional view taken along the line C-C.

FIG. 7 is a cross-sectional view showing an operation process of the apparatus of FIG.

FIG. 8 is a cross-sectional view showing another operation step of the apparatus of FIG.

FIG. 9 is a sectional view illustrating a specific example of the investigation method according to the present invention.

[Explanation of symbols]

 1 measuring tube 2 inner tube 2a inner tube conduit 2b water conduit 3 outer tube 3a outer tube conduit 5 ground 6 measurement hole 6a hole wall 7 horizontal load test member 8 water permeation test member 9 electrode 10 discharge port A 11 elastic bag 12 Discharge port B 13 Rubber sleeve 14 Electric resistance measuring device 16 Upper packer 17 Middle packer 18 Lower packer 19 Hole 20 Bypass pipe 21 Packer hole 23 Horizontal loading test hole 24 Packer hole 26 Water penetration test hole 27 Horizontal loading Test passage 28 Packer passage 29 Water penetration test passage 30 Packer 31 Packer 32 Packer 33 Packer 34 Electrode tube 35 Electrode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-195918 (JP, A) JP-A-60-47115 (JP, A) JP-A-59-18812 (JP, A)

Claims (11)

(57) [Claims] 1. A measuring pipe having a horizontal loading test member and / or a water permeation test member and an electrode is buried in the ground to be subjected to soil investigation, and the horizontal loading test member is used to increase the strength in the ground, and / Or measure the permeability coefficient in the ground by the injection water permeability test member and the electric resistance value of the ground by the electrode with the same measurement hole respectively, and investigate the soil quality before and after chemical solution injection to know the ground improvement situation. Characteristic soil investigation method. 2. The horizontal loading test member comprises a discharge port A formed in a pipe wall of a measuring pipe and an elastic bag covering the discharge port A, and the elastic bag is passed through the pipe line and the discharging port A of the measuring pipe. Ground strength is measured by press-fitting water therein, expanding the elastic bag and pressing the hole wall, and the water-injection / permeability test member has a discharge port B formed in the pipe wall of the measuring pipe and It is composed of a rubber sleeve that covers the discharge port B. The rubber sleeve is pushed open through the conduit of the measuring pipe and the discharge port B to inject water into the ground, and the permeability coefficient of the ground is measured from the injected amount. The electrode is connected to an electric resistance measuring device arranged on the ground, and the specific resistance value of the ground is measured by the measuring device.
Soil survey method described . 3. An inner tube and an outer tube are provided, and the inner tube has an inner tube.
Discharge port A bored in the pipe wall and cover this discharge port A
This horizontal loading test member is made up of elastic bags.
In the inner pipe at a position lower than the
It is composed of a mouth B and a rubber sleeve that covers the mouth B.
The water permeation test member to be installed, and in the longitudinal direction of the inner pipe.
Multiple electrodes are installed at remote locations,
In the pipe line of the inner pipe, water is introduced into the water permeability test member.
The measuring pipe with the pipe installed is buried in the ground where soil investigation is to be conducted.
Installed, the outer pipe is pulled up to expose the horizontal load test member, the water permeation test member and the plurality of electrodes to the outside of the double pipe respectively, and expands and contracts through the conduit of the inner pipe and the discharge port A. Water is pressed into the elastic bag to expand the elastic bag and press the hole wall against the ground strength. Further, the expanded elastic bag is used as a packer to pass through the water conduit and discharge port B and press the rubber sleeve. Open it and inject water into the ground, and from the injected amount, calculate the hydraulic conductivity of the ground, and
The electrical resistance measuring device is used to determine the specific resistance value of the ground between the upper and lower electrodes.
Measure the soil with the same measurement hole and check the soil quality before and after chemical injection.
A soil investigation method characterized by conducting an investigation and knowing the status of ground improvement . It has a 4. inner tube and the outer tube, outside this outer tube
Discharge port A bored in the pipe wall and cover this discharge port A
A plurality of horizontal loading test members composed of elastic bags are installed at desired intervals, and a discharge port B formed in the outer pipe wall between the horizontal loading test members of the outer pipe and this discharge.
A water permeation test member composed of a rubber sleeve that covers the mouth B is installed, a plurality of electrodes are installed at positions distant from each other in the longitudinal direction of the outer tube, and an upper packer is installed on the inner tube tube wall. A lower middle packer and a lower lower packer are installed so as to partition the outer pipe line with a space therebetween, and a hole is formed in the inner pipe wall between the upper packer and the intermediate packer. At the same time, the outer pipe pipeline above the upper packer and the outer pipeline held between the middle packer and the lower packer are connected by a bypass pipe to the measurement pipe in the ground where soil investigation is to be conducted.
Buried and slide the inner tube to make a hole in the inner tube wall
With the discharge port A of one of the horizontal loading test members vertically adjacent to each other formed in the outer pipe wall, and water is pressed into the elastic bag from the inner pipe line through the hole and the discharge port A. Then, the ground strength is measured by inflating the elastic bag and pressing the hole wall, and further sliding the inner pipe to make the hole in the inner pipe wall into the discharge port A of the other horizontal loading test member.
In addition, the ground strength is measured in the same manner as described above, and the inner pipe is slid to form a hole in the inner pipe wall and a discharge port B formed in the outer pipe wall of the water permeation test member. Together, water is press-fitted into the upper elastic bag through the outer pipe line and water is press-fitted into the lower elastic bag through the bypass pipe, and these expanded upper and lower elastic bags are used as packers from the inner pipe line. The rubber sleeve is pushed open through the hole and the discharge port B to inject water into the ground, and the hydraulic conductivity of the ground is measured from the injected amount, and the specific resistance of the ground between the upper and lower electrodes is measured by an electric resistance measuring device. Measure the values and make these measurements.
Inspect the soil quality before and after chemical injection by measuring with the same measurement hole
A soil investigation method characterized by knowing the status of ground improvement . 5. An inner pipe and an outer pipe, wherein the outer pipe is an outer pipe.
A discharge port A bored in the pipe wall and an extension covering the discharge port A
A plurality of horizontal loading test members composed of shrinkable bags are installed at desired intervals, and a discharge port B bored in the outer pipe wall and the discharge port B are provided between the horizontal loading test members of the outer pipe. Exit
A water permeation test member composed of a rubber sleeve covering B is installed, and a plurality of electrodes are respectively installed at positions distant from each other in the longitudinal direction of the outer pipe, and an upper horizontal pipe is provided on the inner pipe wall. A packer hole is provided at a position corresponding to the load test member, and a horizontal load test hole and a packer hole are provided at a position adjacent to the lower horizontal load test member, and an upper packer hole is provided. Above and below,
Packers for partitioning the outer pipe line are formed above and below the horizontal loading test hole and the lower packer hole, respectively.
And, the inner pipe tube wall corresponding to the water permeation test member is provided with water permeation test holes, and these horizontal loading test holes are provided.
A hole for packer and a hole for water permeation test are separately formed in the inner pipe, and they are connected to the horizontal loading test passage, the packer passage and the water permeation test passage, respectively.
The measurement pipe is buried in the ground where soil investigation is to be performed, and the inner pipe is slid to align the horizontal loading test hole with the discharge port A of the upper horizontal loading test member formed in the outer pipe wall. ,
Water is press-fitted into the elastic bag from the horizontal loading test passage through the hole and the discharge port A, the elastic bag is expanded and the hole wall is pressed to measure the ground strength, and then the inner pipe is slid. The horizontal loading test hole is combined with the discharge port A of the lower horizontal loading test member formed in the outer pipe wall, and the ground strength is measured in the same manner as described above. Water is press-fitted into the upper and lower elastic bags through the packer hole and the discharge port A, and the expanded and contracted upper and lower elastic bags are used as packers from the water injection and water permeation test passage to the water and water permeation test hole and the outer tube wall. Through the discharge port B of the water permeation test member drilled in the base, push the rubber sleeve open to inject water into the ground, measure the water permeability coefficient of the ground from the injected amount, and use the electrical resistance measuring device to move up and down. Between the electrodes Measurement of specific resistance value of the ground, measuring these
Measurement using the same measuring hole, and
A soil investigation method characterized by investigating the quality and knowing the status of ground improvement . 6. An electrode tube, in which electrodes are installed at a desired interval, is embedded in parallel with the measuring tube in the ground near the measuring tube, and the electrode of the measuring tube and the electrode of the electrode tube are connected to each other. The specific resistance value of the ground between the two is measured,
The soil investigation method described in any one of 3, 4, and 5. 7. A measuring pipe which is embedded in the ground where soil investigation is to be carried out, and the measuring pipe has a discharge port A formed in the pipe wall.
And / or a horizontal loading test member composed of an elastic bag covering the discharge port A, and / or a discharge port B formed in the wall of the measuring pipe, and a rubber sleeve covering the discharge port B. A soil investigation device in which a water permeation test member composed of and is installed, an electrode is installed in the measuring pipe, and the electrode is connected to an electric resistance measuring device arranged on the ground. 8. A measurement buried in the ground where soil investigation is to be carried out.
Consists tube, the measuring tube is made of a double tube consisting of an inner and outer tubes, discharge drilled in the inner tube tube wall in the inner tube
A horizontal loading test member composed of a mouth A and a stretchable bag covering the discharge port A , and a discharge port formed in the inner pipe wall in the inner pipe positioned below the member. B and this vomiting
Water-injecting / permeating test members each composed of a rubber sleeve covering the outlet B are installed, and a plurality of electrodes are installed at positions distant from each other in the longitudinal direction of the inner pipe, and when the outer pipe is pulled upward. A soil investigation device configured such that the horizontal load test member, the water permeation test member, and the plurality of electrodes are each exposed to the outside of the double pipe. 9. A measurement buried in the ground where soil investigation is to be conducted.
It consists of a pipe , this measuring pipe is composed of a double pipe consisting of an inner pipe and an outer pipe, and this outer pipe is a discharge pipe drilled in the outer pipe wall.
A plurality of horizontal loading test members, each of which is composed of a mouth A and an elastic bag covering the discharge port A, are installed at desired intervals, and an outer tube is provided between the horizontal loading test members of the outer tube. Drilling on the pipe wall
Discharge port B and a rubber sleeve covering this discharge port B
A water permeation test member is installed, and a plurality of electrodes are respectively installed at positions distant from each other in the longitudinal direction of the outer pipe, and the inner pipe wall has an upper packer and an intermediate packer below it. Furthermore, the lower packers below are installed at intervals to partition the outer pipe line,
A hole is formed in the inner pipe wall between the upper packer and the intermediate packer, and the outer pipe pipe is sandwiched between the upper packer and the intermediate packer and the lower packer. A soil investigation device that is connected to the road by a bypass pipe. 10. Soil buried in the ground where soil investigation is to be conducted.
Consists Teikan, the measuring tube is made of a double tube consisting of an inner tube and outer tube, this outer tube was bored out tube tube wall ejection
Consists of an outlet A and an elastic bag that covers this outlet A
A plurality of horizontal loading test members are installed at desired intervals, and the outer pipe wall is drilled between the horizontal loading test members of the outer pipe.
A discharge port B provided and a rubber sleeve covering the discharge port B
A water permeation test member composed of a tube is installed, and a plurality of electrodes are respectively installed at positions distant from each other in the longitudinal direction of the outer pipe, and the inner pipe wall is provided with an upper horizontal loading test member. A hole for a packer at a corresponding position, a hole for horizontal loading test and a hole for a packer are respectively formed at a position corresponding to a lower horizontal loading test member adjacent to the hole, and the upper and lower parts of the hole for an upper packer, and Packers for partitioning the outer pipe line are formed above and below the horizontal loading test hole and the packer hole, respectively, and the water permeation test hole is formed on the inner pipe wall corresponding to the water permeation test member. The horizontal loading test hole, the packer hole and the water permeation test hole are formed separately in the inner pipe line.The horizontal loading test path, the packer path and the water injection permeation test path are respectively formed. Swiped soil survey device in which. 11. The electrode tube in which electrodes are installed at desired intervals in parallel with the measuring tube is embedded in the ground near the measuring tube in parallel with the measuring tube. Izu
The soil investigation device described in one of them .