JP3069602B2 - Rock change measurement apparatus and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rock mass fluctuation measuring device and method for measuring an initial stress acting on a rock mass.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 6-78957 discloses a rock mass fluctuation measuring device for measuring an initial stress acting on a rock mass.

[0003] In this conventional apparatus, a total of eight sets of a pressure receiving plate pair and a strain gauge are arranged on a cushioning member (rubber), and pressure components in eight directions at arbitrary points on the rock are measured by one apparatus. It is configured to allow it.

[0004]

However, according to the above conventional apparatus, the output of each strain gauge is configured to be taken into an external strain measuring instrument via a terminal pattern inside the apparatus and a multi-core cable. Therefore, when performing coring, it is necessary to proceed carefully so as not to damage the multi-core cable. In addition, since a multi-core cable is used, it is difficult to select a relatively deep point as a measurement point of rock. Further, coring obliquely with the apparatus cannot be performed in the vicinity of the buried apparatus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to easily perform coring, perform coring obliquely with an apparatus even in the vicinity of the apparatus, and furthermore, perform rocking of the rock. A relatively deep point can be selected as a measurement point, and it is an object of the present invention to provide an apparatus and a method for measuring rock deformation that do not require the use of a signal cable.

[0006]

The rock fluctuation measuring apparatus of the present invention is buried in a boring hole of a rock and detects an initial stress acting on the rock by detecting a displacement of the rock during coring. A rock mass fluctuation measuring device, comprising: a displacement sensor; an analog / digital converter for generating displacement data during coring from an analog output signal of the displacement sensor; and a memory for storing displacement data of the analog / digital converter. When the data is collected on the ground after coring, the data transmission means for reading the displacement data stored in the memory into an external device and a power supply battery are integrally incorporated.

According to a second aspect of the present invention, in the rock mass fluctuation measuring apparatus according to the first aspect, a scheduler is integrally incorporated, and a schedule for storing displacement data in the memory is preset by the scheduler. It is characterized by having been done.

According to a third aspect of the present invention, in the rock mass fluctuation measuring apparatus according to the first or second aspect, a microprocessor is integrally incorporated, and a control signal of the microprocessor controls each of the devices. The operation is controlled.

According to a fourth aspect of the present invention, in the rock mass fluctuation measuring apparatus according to the first aspect, the azimuth measuring means is integrally incorporated.
The azimuth data measured by the azimuth measuring means is stored in the memory, and the azimuth data is read into the external device together with the displacement data from the memory.

According to a fifth aspect of the present invention, there is provided a rock fluctuation measuring method, comprising the step of boring the rock fluctuation measuring apparatus according to any one of the first, second, third and fourth aspects. Embedding in the hole, storing the displacement data in the memory at the time of coring, removing the rock mass fluctuation device from the boring hole after coring, and displacing the displacement data stored in the memory to the external device. A series of steps includes a step of reading and a step of estimating the initial stress acting on the rock by inverse analysis from the displacement data read into the external device.

[0011]

According to the first aspect of the present invention, there is provided a rock variation measuring apparatus according to the present invention in which a displacement sensor, an analog / digital converter, a memory, a data transmission means, and a battery for power supply are integrally incorporated, and a rock hole is formed in a boring hole of the rock. It is characterized in that it is configured to measure the displacement of the rock during embedding and coring, and to measure the initial stress acting on the rock. For this reason, by disposing the displacement sensor in any direction, it is possible to measure the amount of displacement in any direction. Further, since a cable for connection to an external device such as a conventional device is not connected to the device, coring can be performed very easily. In addition, since the cable is not required, coring in the direction oblique to the boring hole can be easily performed in the vicinity of the apparatus, and a relatively deep point in the rock can be selected as a measurement point. . In particular, it becomes possible to measure the change in rock mass accompanying the release of stress in a direction oblique to the device, which could not be performed with the conventional device.

Then, a scheduler is incorporated in the device, and the scheduler is designed to supply the electromotive force of the power supply battery to each device only at the time of coring near the device, thereby suppressing the consumption of the power supply battery. be able to.

Further, by incorporating a microprocessor in the apparatus and controlling the operation contents of each device (for example, the sampling number of the analog output signal of the displacement sensor, the amplification factor, etc.) by the microprocessor, it is important for the initial stress measurement. The quality of the displacement data at the time of coring in the vicinity of the apparatus can be improved, and the analysis accuracy can be improved.

In addition, by incorporating an azimuth measuring means, for example, a gyrocompass, into the device, the three-dimensional position of the displacement sensor can be accurately known regardless of the state of the device being buried. Can be easily known as the displacement amount in the direction of.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing the use of a rock mass fluctuation measuring apparatus according to an embodiment, FIG. 2 is a view showing another use of the apparatus, and FIG.
Shows configuration diagrams of the measuring apparatus.

As shown in FIG. 3, the measuring apparatus 1 of this embodiment includes one or a plurality of displacement sensors 10, an analog / digital converter 20, a memory 30, a data transmission means 40, and a battery 50 for a power supply. , These devices 10, 20, 3
0, 40 and 50 are integrated.

The displacement sensor 10 is a sensor for detecting the amount of displacement of the rock (including the amount of inclination of the rock) during coring. For example, as shown in FIG.
Detects displacements in three directions on the same plane that are arranged at ° intervals, and detects displacements in three directions that are arranged on the X, Y, and Z coordinate axes that represent three-dimensional coordinates and are orthogonal to each other, as shown in FIG. As in the case of the above-described conventional device, a displacement amount in an arbitrary direction can be detected.

The analog / digital converter 20 is connected to the displacement sensor 10 and creates displacement data during coring from an analog output signal of the displacement sensor 10.

The memory 30 is connected to the analog / digital converter 20 and stores displacement data of the analog / digital converter 20.

The data transmission means 40 is connected to the memory 30, and reads the displacement data stored in the memory 30 into an external device (not shown) installed on the ground side. At the time of collection, a cable is connected and a connector that sends displacement data in the memory to the external device via the cable, or an oscillator that sends displacement data to the external device using electromagnetic waves, ultrasonic waves, infrared rays, visible light, etc. as a medium It consists of. Here, the external device obtains the initial stress acting on the rock based on the displacement data read via the data transmission means 40.

The power supply battery 50 serves as a power supply for the displacement sensor 10, the analog / digital converter 20, the memory 30, and the data transmission means 40.

Next, a method of measuring the initial stress acting on the rock using the rock fluctuation measuring apparatus 1 configured as described above will be described with reference to FIG. 1 and FIG.

First, a large-diameter boring hole 3 is formed up to the measurement point of the rock 2, a small-diameter pilot hole 4 is formed deep in the boring hole 3, and the rock variation measuring apparatus 1 is inserted into the pilot hole 4. Set and buried with cement milk 5. In this way, the rock variation measuring device 1 is buried in the borehole 3.

Thereafter, after the cement milk 5 is solidified, coring is performed as shown in FIG. 1 or coring is performed obliquely with the boring hole 3 as shown in FIG.
The initial stress acting on the bedrock 2 (strictly, the core 6) is released. Reference numeral 7 shown in FIG. 1 represents a cylindrical rock portion existing around the core 6 and removed by coring, and reference numeral 8 shown in FIG. 2 represents a rock portion also removed by coring. During this coring,
An analog output signal of each displacement sensor 10 is input to an analog / digital converter 20, and after being amplified by the analog / digital converter 20, is sampled at a predetermined sampling cycle and converted into a digital signal, thereby generating displacement data. Is done. And this displacement data is
Stored in the memory 30.

Then, when the core 6 is taken out and the data transmission means 40 is a connector, the cement milk 5 is removed, a cable is connected to the connector 40, and the displacement data in the memory 30 is read by an external device. When the transmission means 40 is an oscillator or the like, the oscillator 4 or the like can be connected without connecting the cable without removing the cement milk 5.
0, the displacement data in the memory 30 can be read by an external device. The external device estimates the initial stress acting on the rock 2 (core 6) based on the read displacement data by an inverse analysis (inversion).

As described above, the rock mass fluctuation measuring apparatus 1 of this embodiment incorporates the displacement sensor 10, the analog / digital converter 20, the memory 30, the data transmission means 40, and the power supply battery 50 integrally, and The core 2 is embedded in the boring hole 3 to measure the displacement of the rock 2 (core 6) during coring and to measure the initial stress acting on the rock 2 (core 6). . Therefore, by disposing the displacement sensor 10 in an arbitrary direction, it is possible to measure the amount of displacement in an arbitrary direction. Further, since a cable for connection to an external device such as a conventional device is not connected to the device 1, coring can be performed very easily. Further, since the cable is not required, a deep point of the bedrock 2 can be selected as a measurement point.

FIG. 6 shows the configuration of a rock mass fluctuation measuring apparatus according to another embodiment. The rock mass fluctuation measuring apparatus 1 has a configuration in which a scheduler 60 is further incorporated, and a schedule for storing displacement data in the memory 30 is set in advance by the scheduler 60. According to the rock mass fluctuation measuring device 1, the scheduler 60 schedules the electromotive force of the power supply battery 50 to be supplied to each of the devices 10, 20, 30, and 40 only at the time of coring in the vicinity of the device. The consumption of the battery 50 can be suppressed.

FIG. 7 shows the configuration of a rock mass fluctuation measuring apparatus according to still another embodiment. This rock mass fluctuation measuring device 1
Is a system in which a microprocessor 70 is integrated into the rock mass fluctuation measuring device 1 shown in FIG. 6, and each device 20, 30, 40, 50,
A configuration for controlling the operation contents of 60 is adopted. According to the rock mass fluctuation measuring device 1, the microprocessor 70 controls, for example, the number of samples of the analog output signal of the displacement sensor 10, the amplification factor, etc., so that the coring near the device is considered important for the initial stress measurement. The quality of displacement data at the time can be improved, and the analysis accuracy can be improved.

FIG. 8 shows the configuration of a rock mass fluctuation measuring apparatus according to still another embodiment. This rock mass fluctuation measuring device 1
The azimuth measuring means 80, for example, a gyro compass is integrated into the rock mass fluctuation measuring apparatus 1 shown in FIG.
0, and the azimuth data is read from the memory 30 together with the displacement data into an external device. According to this rock mass fluctuation measuring device 1, the three-dimensional position of the displacement sensor 10 can be accurately known regardless of the buried state of the device 1, and in which direction the measured displacement amount is the displacement amount. Can be easily known.

If a rechargeable battery is used as the power supply battery 50, the battery can be charged via the connector.
The trouble and frequency of battery replacement can be reduced.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a usage state of a rock deformation measuring apparatus according to one embodiment, (A) is a sectional view, and (B) is a perspective view.

FIGS. 2A and 2B are diagrams showing another use mode of the measuring device, in which FIG. 2A is a sectional view and FIG. 2B is a perspective view.

FIG. 3 is a configuration diagram of the measurement device.

FIG. 4 is a diagram showing an arrangement example of a displacement sensor of the measuring device.

FIG. 5 is a view showing another example of the arrangement of the displacement sensor.

FIG. 6 is a configuration diagram of a rock mass fluctuation measuring device according to another embodiment.

FIG. 7 is a configuration diagram of a rock mass fluctuation measuring device according to still another embodiment.

FIG. 8 is a configuration diagram of a rock mass fluctuation measuring device according to still another embodiment.

[Explanation of symbols]

 Reference Signs List 1 rock mass fluctuation measuring device 2 rock mass 3 boring hole 6 core 10 displacement sensor 20 analog / digital converter 30 memory 40 data transmission means 50 power supply battery 60 scheduler 70 microprocessor 80 direction measurement means

Continuation of the front page (72) Inventor Hiroshi Ishii 4--20-2, Hongo, Bunkyo-ku, Tokyo (56) References JP-A-3-3535 (JP, A) JP-A-1-199130 (JP, A) JP-A-8-106592 (JP, A) JP-A-7-294658 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01L 5/00

Claims (5)

(57) [Claims] 1. A rock mass fluctuation measuring device buried in a boring hole of a rock mass and measuring an initial stress acting on the rock mass by detecting a displacement amount of the rock mass during coring, comprising: a displacement sensor; An analog / digital converter that creates displacement data during coring from an analog output signal of the displacement sensor, a memory that stores displacement data of the analog / digital converter, and a time point when the data is collected on the ground after coring
And a data transmission means for reading the displacement data stored in the memory into an external device, and a battery for power supply, which are integrally incorporated. 2. The rock mass fluctuation measuring apparatus according to claim 1, wherein a scheduler is integrally incorporated, and a schedule for storing displacement data in the memory is set in advance by the scheduler. 3. The rock mass fluctuation measuring device according to claim 1, wherein a microprocessor is integrally incorporated, and the operation content of each of the devices is controlled by a control signal of the microprocessor. 4. An azimuth measuring means is integrally incorporated, azimuth data measured by the azimuth measuring means is stored in the memory, and the azimuth data is read from the memory together with the displacement data into the external device. The rock mass fluctuation measuring device according to any one of claims 1, 2 and 3. 5. A step of burying the rock variation measuring device according to claim 1, 2, 3, or 4 in the boring hole, and storing displacement data in the memory during coring. Causing the rock variation device to be removed from the boring hole after coring; and loading the displacement data stored in the memory into the external device; and loading the displacement data read into the external device into the rock. A method for measuring rock deformation, comprising: a step of estimating an acting initial stress by an inverse analysis;