JP3885038B2 - Rock physical property evaluation method and system, program, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rock physical property evaluation method and system, a program, and a recording medium.
[0002]
[Prior art]
In lining design for steel pipes and concrete, it is necessary to appropriately grasp the physical properties of rock (synthetic deformation coefficient). Therefore, in order to accurately grasp the physical properties of the rock mass, it is required to carry out a plate loading test closely. However, it is not realistic in terms of workability and economy to carry out the test on all rock masses whose physical property values change in a complicated manner in the construction area. In particular, the tests related to the tilt shaft area are very difficult to implement in view of the test environment, so several rocks with geological conditions that are almost the same as the rocks to be constructed will be conducted. It has been common to perform elastic wave velocity measurements over a wide range. In this case, the results of the flat plate loading test and the results of elastic wave velocity measurement were complemented and the physical properties of the rock in the construction area were evaluated. In addition, a process of qualitatively incorporating the results of geological surveys over the entire line into the correlation has been performed (see Patent Documents 1 and 2).
[0003]
[Non-Patent Document 1]
Suimon Iron Pipe No.154 (1988.3) Suimon Iron Pipe Association [0004]
[Non-Patent Document 2]
Suimon Iron Pipe No.196 (1989.9) Association of Suimon Iron Pipe [0005]
[Problems to be solved by the invention]
However, problems remain in the conventional method. That is, the flat plate loading test is a problem caused by the fact that a work is required to fix the tester horizontally, apply a load to the test plate, and measure the change tendency between the load and the displacement amount. Due to the characteristics of the test method, the installation status of the testing machine has a great influence on the accuracy of the test results. For example, in a test environment such as a tilt shaft or a vertical shaft, the test machine installation surface is not originally a horizontal plane, and the work area is limited.
[0006]
For this reason, it is difficult to secure a space for arranging necessary materials and the like, and it becomes necessary to provide special equipment for carrying in and carrying these materials and the like. Therefore, the installation of the testing machine itself becomes difficult. Of course, the workability of the workers in the inclined shaft or the like is not good, and problems remain in terms of work efficiency.
[0007]
Furthermore, in addition to the difficulty in installing the testing machine, there is a concern that the test results obtained in a difficult test environment will not be accurate and good. In particular, when the geological properties of the rock mass to be evaluated change in a complex manner, it is not feasible in terms of efficiency to collect the sample rocks for testing finely and evaluate the rock mass. If evaluated, it was difficult to reliably evaluate the entire evaluation rock. On the other hand, if it takes time to evaluate the rock mass by adopting the conventional method, it may lead to a decrease in the excavation efficiency of tunnels and the like, which may affect the progress of this construction.
[0008]
Accordingly, the present invention has been made paying attention to such a problem, and an object thereof is to provide a rock physical property evaluation method and system, a program, and a recording medium that can efficiently obtain an evaluation result with good accuracy. .
[0009]
[Means for Solving the Problems]
The rock physical property evaluation method of the present invention that achieves the above object is a method for evaluating rock physical properties, and performs in-situ testing and elastic wave velocity measurement on other rocks having the same geological properties as the evaluation rock. And executing a multiple regression analysis based on the step of obtaining the deformation coefficient value and the elastic wave velocity, the obtained deformation coefficient value and the elastic wave velocity, and the geological property information of the other surrounding rocks, and A step of deriving a multiple regression correlation equation for information and a deformation coefficient, a step of applying the geological property information of the evaluation rock mass to the multiple regression correlation equation to estimate a deformation coefficient value of the evaluation rock mass, and one line in the evaluation rock mass Performing an elastic wave velocity measurement only for obtaining an elastic wave velocity of the evaluation rock mass,
Recognizing the strength of the evaluation rock mass or its change based on the elastic wave velocity of the evaluation rock mass, collating this with a predetermined judgment criterion and determining whether or not individual examination of the deformation coefficient is necessary; A step of setting the estimated deformation coefficient value as the deformation coefficient value of the evaluation rock mass.
[0010]
In the second invention, in the first invention, when it is determined by the determination that individual examination is necessary, a finite element method analysis is performed on the individual examination part, and a deformation coefficient value is newly calculated. It is characterized by.
[0011]
A third invention is characterized in that, in the first or second invention, the evaluation rock is an inclined shaft or a vertical shaft, and other surrounding rocks are horizontal shafts.
[0012]
According to a fourth invention, in any one of the first to third inventions, the geological property information includes at least one of a rock type distribution ratio, a hardness category, a crack interval, a crack property category, and a spring water amount. Features.
[0013]
5th invention WHEREIN: In any 1st-4th invention, when the geological property of an evaluation rock or a surrounding other rock changes to an area or time-dependent, the item of the geological property information to use is made into the geological characteristic of a change point. It is characterized by being selectively used in correspondence.
[0014]
The sixth invention is a system for evaluating the physical properties of a rock mass, performing an in-situ test and elastic wave velocity measurement on other rock masses having the same geological properties as the evaluation rock mass, Perform multiple regression analysis based on the means for acquiring elastic wave velocity, the obtained deformation coefficient value and elastic wave velocity, and the geological property information of the surrounding other rock mass, and perform multiple regression on the geological property information and the deformation coefficient The means for deriving the correlation equation, the geological property information of the evaluation rock mass are applied to the multiple regression correlation equation, the means for estimating the deformation coefficient value of the evaluation rock mass, and the elastic wave velocity measurement is performed for only one survey line in the evaluation rock mass Then, the means for obtaining the elastic wave velocity of the evaluation rock mass, the strength of the evaluation rock mass or its change is recognized based on the elastic wave velocity of the evaluation rock mass, and this is collated with a predetermined criterion to individually examine the deformation coefficient. Necessity A rock physical property evaluation system, comprising: a means for performing the determination, and a means for setting the estimated deformation coefficient value as the deformation coefficient value of the evaluation rock when it is determined by the determination that individual examination is not necessary It takes.
[0015]
The seventh invention is a program for causing a computer to execute a method for evaluating physical properties of a rock, and performs an in-situ test and elastic wave velocity measurement on other rocks having the same geological properties as the evaluated rock. The step of obtaining the deformation coefficient value and the elastic wave velocity obtained in the above, the multiple regression analysis based on the obtained deformation coefficient value and elastic wave velocity, and the geological property information of the surrounding other rock mass, A step of deriving a multiple regression correlation equation for property information and a deformation coefficient, a step of applying the geological property information of the evaluation rock mass to the multiple regression correlation equation, estimating a deformation coefficient value of the evaluation rock mass, and 1 in the evaluation rock mass The process of obtaining the elastic wave velocity of the evaluation rock mass obtained by executing the elastic wave velocity measurement for only the survey line, and the strength of the evaluation rock mass or its change is recognized based on the elastic wave velocity of the evaluation rock mass. A step of determining whether or not individual examination of the deformation coefficient is necessary by collating with a predetermined determination criterion, and when it is determined by the above determination that individual examination is not necessary, the estimated deformation coefficient value is used as the deformation coefficient value of the evaluation rock And a rock physical property evaluation program characterized by comprising: This program is composed of codes for performing the operation of each step.
[0016]
The eighth invention relates to a computer-readable recording medium in which the rock physical property evaluation program according to the seventh invention is recorded.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an example of the structure of a hydraulic pipe inclined shaft. The hydraulic pipe inclined shaft shown in the figure is installed as a route for sending dam reservoir water to the turbine of the power plant, and the rock around the inclined shaft is an application target example of the rock physical property evaluation method of the present invention. Become. In constructing the inclined shaft, the rock drilling is performed by excavating a tunnel boring machine from the power plant side toward the dam dam body. The hydraulic iron pipe laid in such a hydraulic pipe line can be thinned as much as possible by substantially equilibrating the pressure from the surrounding rock and the water pressure passing through the iron pipe. Therefore, it is necessary to grasp the rock pressure and geological properties in detail and surely.
[0018]
FIG. 2A is a diagram showing a test situation of a flat plate loading test, and FIG. 2B is a diagram showing an outline of elastic wave velocity measurement. The plate loading test is an in-situ test in which a load is applied to the rock surface through a flat loading plate, and the bearing capacity and deformation characteristics of the rock are calculated from the relationship between the load strength and the loading plate settlement. Specifically, as shown in the figure, a steel plate having a diameter of about 30 cm to 60 cm is placed on the bedrock, and a loading of about 10 Mpa, for example, is executed by a jack. By measuring deformation characteristics, etc., it becomes possible to grasp the strain distribution of heterogeneous rock. In the elastic wave velocity measurement, elastic waves are generated at the transmission point of the target rock, propagated through the rock, captured at the reception point, and the velocity distribution is analyzed to analyze the rock strength, etc. This is a method that can estimate (B) As shown in the figure, when the elastic wave velocity is large, it is determined that the rock mass strength is high, and when the elastic wave velocity is small, it is determined that the rock mass strength is low.
[0019]
In the present invention, which eliminates the difficulty of performing the flat plate loading test and the like in a steeply inclined shaft (or vertical shaft) as described above, the in-situ test in the shaft is reduced as much as possible, and observation information on geological properties is also provided. Is to be used effectively. FIG. 3 shows a system configuration example for realizing the rock physical property evaluation method of the present invention. In this system configuration example, in addition to the hardware configuration, information processed by the hardware and its processing flow are also outlined.
[0020]
The hardware configuring the system 100 is mainly configured by an information input terminal 101 such as a PDA and an information processing terminal 102 such as a personal computer connected to the information input terminal 101 via a network. Of course, both the input interface and the information processing apparatus may be operated integrally. In addition, the information processing terminal 102 includes a prior test / geological observation result database 103 and a geological database 104.
[0021]
The system 100 according to the present invention is assumed to have a configuration including the PDA 101 and the personal computer 102 as an example. However, the present invention is not limited to this. A system can be arbitrarily configured as long as it is a combination of an information input terminal 101 that is easy to use at the original position where a flat plate loading test or the like is performed and an information processing terminal 102 having a processable function such as analysis. Further, the information input terminal 101 or the information processing terminal 102 stores a program for realizing the rock physical property evaluation method of the present invention in an appropriate storage device such as a program database, for example. The rock physical property evaluation method is executed by reading it into memory as appropriate.
[0022]
Further, the PDA 101 and the personal computer 102 include, as computers, an I / O that performs mutual data communication, an output interface such as a display that outputs information, and an input interface that accepts selections and instructions from the user.
[0023]
The databases 103 and 104 and the like are not limited to being provided integrally with the personal computer 102, but may be integrally operated via a network while being attached to another device. In addition to the dedicated line and the Internet, various networks such as a WAN (Wide Area Network), a LAN, a power line network, a wireless network, a public line network, and a mobile phone network can be used for the networks connecting the PDA 101 and the personal computer 102, respectively. Can also be adopted. Further, if a virtual private network technology such as VPN is used, communication with improved security is established when the Internet is adopted.
[0024]
Therefore, a procedure for executing the rock physical property evaluation method of the present invention using the system 100 as described above will be described. First, the outline of the processing will be described with reference to FIG. FIG. 4 is a diagram showing a main flow of the rock physical property evaluation method. In addition, the flow demonstrated here shall process either the said information input terminal 101 or the information processing terminal 102, or both work together.
[0025]
The system 100 performs the above-mentioned plate loading test (in-situ test) on other surrounding rocks (e.g., horizontal shafts that are easy to work) having the same geological characteristics as the evaluation rocks such as the inclined shafts for hydraulic pipes. A deformation coefficient value and an elastic wave velocity obtained by executing the elastic wave velocity measurement are acquired (s400, s401). Then, a multiple regression analysis based on the obtained deformation coefficient value and elastic wave velocity and geological property information (geological observation information) of the surrounding other rock mass is performed (s402). By this analysis, a multiple regression correlation equation relating to the geological property information and the deformation coefficient is derived (s403).
[0026]
The geological property information includes the rock type distribution ratio (plastic deformation type: conglomerate or sandstone, etc .; elastic deformation type: serpentine or mudstone, etc.) hardness classification (hard to soft), crack interval (in cm), cracks It shall include at least one of property classification (fragile part distribution, opening width, inclination angle, etc.) and spring water volume. In addition, when the geological properties of the evaluation rock or the surrounding other rocks change in the region or with time, the items of the geological property information to be used are selectively used corresponding to the geological characteristics of the changing point. As a result, it is possible to accurately evaluate the physical properties of a rock whose geological properties change in a complex manner.
[0027]
Next, the geological property information of the evaluation rock mass is applied to the multiple regression correlation equation derived as described above, and the deformation coefficient value of the evaluation rock mass is estimated (s404). Further, in addition to these processes, elastic wave velocity measurement is executed for only one survey line in the evaluation rock (eg, one measurement at the top), and the elastic wave velocity of the evaluation rock is acquired (s405, s406). Thus, the strength of the evaluation rock mass or its change is recognized based on the elastic wave velocity of the evaluation rock mass (s407).
[0028]
About the strength or the like of the recognized evaluation rock, this is compared with a predetermined judgment criterion determined in advance to determine whether or not individual examination of the deformation coefficient is necessary (s408). This judgment is performed to respond flexibly to, for example, the case where the rock subject to evaluation is significantly different from the surrounding rocks of the same nature (eg sudden change points, extremely weak). The
[0029]
If it is determined by the determination that individual examination is not necessary, the estimated deformation coefficient value is set as the deformation coefficient value of the evaluation rock (s410), and the process is terminated. On the other hand, if it is determined by the determination that individual examination is necessary, a finite element method analysis is performed on the individual examination part, and a deformation coefficient value is newly calculated (s411). The newly calculated deformation coefficient value is estimated to be the deformation coefficient value of the evaluation rock, and the process is terminated.
[0030]
Next, the detailed flow will be described. FIG. 5 is a diagram showing a detailed flow of the rock physical property evaluation method. In addition, various processing information shown together with the system 100 in FIG. As the information type to be processed, as shown in FIG. 3, each information of a plate loading test, an elastic wave velocity measurement, and a geological observation result at a construction point as another rock around the original position can be assumed. Also, for the plate loading test, the synthetic deformation coefficient, for the elastic wave velocity measurement, the loose region elastic wave velocity, the loose region depth, and the base rock part elastic wave velocity, and for the geological observation results, the rock type distribution ratio, hardness classification, Information on the crack interval, crack property classification, and amount of spring water is the object of processing. These pieces of information are referred to as information 110 on other surrounding rocks. On the other hand, the information on the geological observation result and the elastic wave velocity measurement is also processed for the design location which is the original position where the evaluation rock mass exists. This is the information 120 of the evaluation bedrock.
[0031]
The information 110 on other surrounding rocks is stored in the preceding test / geological observation result database 103 via the PDA 101. The information 120 on the evaluation rock is stored in the geological database 104 via the PDA 101.
[0032]
First, the system 100 extracts geological information (geological properties or geological observation results) about other rocks having the same properties as the evaluation rock from the preceding test / geological observation result database 103 (s501), and performs sensitivity analysis thereof. (S502). Then, the geological information with strong sensitivity is recognized (s503).
[0033]
On the other hand, from the results of the plate loading test and elastic wave velocity measurement conducted in other surrounding rock masses, the calculation of the synthetic deformation coefficient (s504) and the calculation of the elastic wave velocity and the loosening zone depth (s508) Process. Further, based on the calculated composite deformation coefficient, a finite element method analysis is executed (s505), and a base rock deformation coefficient is calculated (s506). In this calculation, the base rock elastic wave velocity is separately calculated (s507) and reflected. Multiple regression analysis is performed by combining the information on the geological properties thus derived and various test results, thereby deriving a multiple regression correlation equation indicating the correlation between the geological information and the base rock deformation coefficient (s510).
[0034]
On the other hand, processing is also performed for information on the results of geological observation obtained for the design location and information on elastic wave velocity measurement. Here, the geological information obtained as a result of the geological observation (s520) is stored in the geological database 104. Further, the base rock deformation coefficient of the evaluation rock mass is estimated by removing the margin from the multiple regression correlation equation and applying the geological information (s521, s522).
[0035]
As for the obtained base rock deformation coefficient, the result of the elastic wave velocity measurement performed on only one survey line in the evaluation rock, that is, the elastic wave velocity of the evaluation rock is applied by single regression (s523, s524). Thereby, for example, a location where the evaluation rock is remarkably weak is recognized (s525), and the necessity of individual examination of the deformation coefficient is determined. If it is determined by the determination that individual examination is necessary (s525: YES), a finite element method analysis is performed on the individual examination part (s526), and a wall surface displacement amount is calculated (s527). A design synthetic deformation coefficient (deformation coefficient value) is newly calculated (s528). On the other hand, when it is determined by the determination that individual examination is not necessary (s525: NO), the estimated deformation coefficient value is set as the deformation coefficient value of the evaluation rock, and the process is terminated.
[0036]
A comparison result with the conventional method is shown below about the evaluation content obtained by performing the rock mass physical property evaluation method of the present invention as described above. FIG. 6 is a diagram showing the relationship among geological properties, elastic wave velocity, and deformation coefficient. The graph shown in FIG. 6 combines the data of rock type ratio, chlorite surface ratio and clay layer ratio, shock wave velocity measurement result, and deformation coefficient along the pipeline extension of a certain hydraulic pipe slope. It is shown. What should be noted here is the data of the deformation coefficient finally used. In this data, the deformation coefficient (estimated value) obtained by the present invention substantially coincides with the result of the in-situ test (that is, the actually measured value). Therefore, it is clear that the estimation is performed with high accuracy while reducing the in-situ test. In addition, the multiple regression correlation equation obtained by the multiple regression correlation analysis is also highly accurate as shown in FIG. Therefore, if the information on the geological properties of other surrounding rock masses is appropriately applied to the multiple regression correlation equation, it is possible to estimate a deformation coefficient value with excellent accuracy.
[0037]
【The invention's effect】
As described above in detail, according to the rock physical property evaluation method of the present invention, it is possible to suppress the burden of the in-situ test even in an environment such as a tilt shaft or a vertical shaft. Therefore, the physical property evaluation of the rock mass can be carried out efficiently and at a low cost. In addition, while enabling efficient evaluation in this way, it is possible to obtain a good evaluation result with high accuracy. The effect can be achieved especially in difficult situations where the geological properties of the rock to be evaluated change in a complex manner. Moreover, since accurate rock mass evaluation is efficiently realized, the influence on the excavation efficiency of tunnels and the like can be minimized.
Therefore, it is possible to provide a rock physical property evaluation method and system, a program, and a recording medium that can efficiently obtain evaluation results with good accuracy.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of the structure of a hydraulic pipe inclined shaft.
FIG. 2A is a diagram showing a test status of a flat plate loading test, and FIG. 2B is a diagram showing an outline of elastic wave velocity measurement.
FIG. 3 is a diagram showing a configuration example of a rock mass property evaluation system.
FIG. 4 is a diagram showing a main flow of a rock physical property evaluation method.
FIG. 5 is a diagram illustrating a detailed flow of a rock physical property evaluation method.
FIG. 6 is a diagram showing relationships among geological properties, elastic wave velocities, and deformation coefficients.
FIG. 7 is a diagram illustrating a relationship between an actual measurement value and a predicted value in multiple regression analysis.
[Explanation of symbols]
100 Rock physical property evaluation system, System 101 Information input terminal, PDA
102 Information processing terminal, personal computer 103 Preliminary examination / geological observation result database 104 Geological database 120 Information on evaluation rock

Claims (8)

A method for evaluating physical properties of a rock,
A step of performing an in-situ test and elastic wave velocity measurement on other rocks having the same geological properties as the evaluation rock mass to obtain a deformation coefficient value and an elastic wave velocity;
Performing a multiple regression analysis based on the obtained deformation coefficient value and elastic wave velocity, and geological property information of the surrounding other rock mass, and deriving a multiple regression correlation equation regarding the geological property information and the deformation coefficient;
Applying the geological property information of the evaluation rock mass to the multiple regression correlation equation, and estimating the deformation coefficient value of the evaluation rock mass;
Performing elastic wave velocity measurement on only one survey line in the evaluation rock mass to obtain the elastic wave velocity of the evaluation rock mass;
Recognizing the strength of the evaluation rock mass or its change based on the elastic wave velocity of the evaluation rock mass, collating this with a predetermined criterion, and determining whether or not individual examination of the deformation coefficient is necessary,
When it is determined by the determination that individual examination is not necessary, the step of setting the estimated deformation coefficient value as the deformation coefficient value of the evaluation rock,
A method for evaluating physical properties of rock mass, comprising: 2. The rock physical property according to claim 1, wherein, when it is determined by the determination that individual examination is necessary, a finite element method analysis is performed on the individual examination part, and a deformation coefficient value is newly calculated. Evaluation methods. The method for evaluating physical properties of a rock mass according to claim 1 or 2, wherein the evaluation rock mass is an inclined or vertical shaft, and other surrounding rock masses are horizontal shafts. The rock property evaluation according to any one of claims 1 to 3, wherein the geological property information includes at least one of a rock type distribution ratio, a hardness category, a crack interval, a crack property category, and an amount of spring water. Method. When the geological properties of the evaluation rock or other surrounding rocks change in the region or with time, the items of the geological property information to be used are selectively used according to the geological characteristics of the changing point. 4. The method for evaluating physical properties of rock according to any one of 4 above. A system for evaluating physical properties of rock,
Means for performing an in-situ test and elastic wave velocity measurement on other rock masses having geological properties substantially similar to the evaluation rock mass, and obtaining a deformation coefficient value and an elastic wave velocity;
Means for performing a multiple regression analysis based on the obtained deformation coefficient value and elastic wave velocity, and geological property information of the surrounding other rock mass, and deriving a multiple regression correlation equation regarding the geological property information and the deformation coefficient;
Means for applying the geological property information of the evaluation rock mass to the multiple regression correlation equation, and estimating a deformation coefficient value of the evaluation rock mass;
Means for performing elastic wave velocity measurement on only one survey line in the evaluation rock and obtaining the elastic wave velocity of the evaluation rock;
Means for recognizing the strength of the evaluation rock mass or a change thereof based on the elastic wave velocity of the evaluation rock mass, and checking whether or not individual examination of the deformation coefficient is necessary by collating this with a predetermined criterion;
If it is determined by the determination that individual examination is not necessary, the estimated deformation coefficient value as a deformation coefficient value of the evaluation rock,
A rock physical property evaluation system characterized by including: A program for causing a computer to execute a rock physical property evaluation method,
Obtaining deformation coefficient values and elastic wave velocities obtained by performing in-situ tests and elastic wave velocity measurements on surrounding rocks having the same geological properties as the evaluation rocks;
Performing a multiple regression analysis based on the obtained deformation coefficient value and elastic wave velocity, and geological property information of the surrounding other rock mass, and deriving a multiple regression correlation equation regarding the geological property information and the deformation coefficient;
Applying the geological property information of the evaluation rock mass to the multiple regression correlation equation, and estimating the deformation coefficient value of the evaluation rock mass;
Obtaining elastic wave velocity of the evaluation rock obtained by executing elastic wave velocity measurement for only one line in the evaluation rock;
Recognizing the strength of the evaluation rock mass or its change based on the elastic wave velocity of the evaluation rock mass, collating this with a predetermined criterion, and determining the necessity of individual examination of the deformation coefficient,
When it is determined by the determination that individual examination is not necessary, the step of setting the estimated deformation coefficient value as the deformation coefficient value of the evaluation rock,
A rock physical property evaluation program characterized by including: A computer-readable recording medium in which the rock physical property evaluation program according to claim 7 is recorded.

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