CN-122022125-A - Loading and unloading test evaluation method for control effect of surrounding rock of coal mine spraying support material

CN122022125ACN 122022125 ACN122022125 ACN 122022125ACN-122022125-A

Abstract

The invention relates to the technical field of coal mine roadway support, and provides a loading and unloading test evaluation method for a control effect of surrounding rock of a coal mine spraying support material, which comprises the following steps: determining data feature vectors according to loading and unloading test data of the sprayed supporting material surrounding rock and the non-sprayed supporting material surrounding rock, inputting the data feature vectors into a loading and unloading test evaluation model, outputting loading and unloading test control effect probability distribution vectors by the loading and unloading test evaluation model, determining loading and unloading test control effect grades according to the loading and unloading test control effect probability distribution vectors, realizing scientific evaluation of the control effect of the spraying supporting material surrounding rock on the surrounding rock in the loading and unloading cycle process, and providing more accurate experimental basis for the long-term supporting design of deep high-risk roadways.

Inventors

LI PENGJIE
LIU WENJU
YUAN GUIYANG
GAO FUQIANG
LU ZHIGUO
LOU JINFU
YANG LEI
WANG XIAOQING
LI JIANZHONG
XI CHAODONG
ZHU GUANGPEI

Assignees

中煤科工开采研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20251229

Claims (10)

1. The method for testing and evaluating the loading and unloading of the surrounding rock of the coal mine spraying support material is characterized by comprising the following steps of: acquiring loading and unloading test data of sprayed support material surrounding rock and non-sprayed support material surrounding rock, wherein the loading and unloading test data comprise uniaxial cyclic loading and unloading test data, uniaxial incremental voltage stabilizing cyclic loading and unloading test data and uniaxial incremental step cyclic loading and unloading test data; Determining a data characteristic vector according to the loading and unloading test data, wherein the data characteristic vector comprises a single-axis cyclic loading and unloading test, a single-axis incremental voltage stabilizing cyclic loading and unloading test and a single-axis incremental step cyclic loading and unloading test index evaluation score; The data characteristic vector is input into an loading and unloading test evaluation model, and the loading and unloading test evaluation model outputs a loading and unloading test control effect probability distribution vector of the spraying support material surrounding rock, wherein the loading and unloading test evaluation model is a model which is obtained through machine learning training and used for evaluating the loading and unloading test control effect of the spraying support material surrounding rock, and is used for determining sample data characteristic vectors and single-axis cyclic loading and unloading tests, single-axis increment voltage-stabilizing cyclic loading and unloading tests and single-axis increment step cyclic loading and unloading test index evaluation scores in the sample data characteristic vectors; And determining the loading and unloading test control effect level according to the loading and unloading test control effect probability distribution vector.
2. The method for evaluating loading and unloading test of surrounding rock of coal mine spraying support material according to claim 1, further comprising the steps of obtaining a loading and unloading test evaluation model, comprising: sample loading and unloading test data of the sprayed support material surrounding rock and the non-sprayed support material surrounding rock are obtained, a sample data feature vector is determined according to the sample loading and unloading test data of the sprayed support material surrounding rock, and control effect grade labels corresponding to single-axis cyclic loading and unloading tests, single-axis increment voltage-stabilizing cyclic loading and unloading tests and single-axis increment step cyclic loading and unloading test index evaluation scores in the sample data feature vector are determined; Generating a virtual sample data feature vector according to the sample data feature vector, and determining a control effect grade label corresponding to the single-axis cyclic loading and unloading test, the single-axis increment voltage stabilizing cyclic loading and unloading test and the single-axis increment step cyclic loading and unloading test index evaluation score in the virtual sample data feature vector; Performing model training according to sample data feature vectors, virtual sample data feature vectors and control effect grade labels corresponding to separated Hopkinson pressure bar increment cyclic impact test index evaluation scores and triaxial cyclic impact test index uniaxial cyclic loading and unloading tests, uniaxial increment voltage stabilizing cyclic loading and unloading tests and uniaxial increment step cyclic loading and unloading test index evaluation scores, and constructing a loading and unloading test evaluation model; and constraining and updating model parameters based on a preset composite loss function, wherein the composite loss function comprises a classification error loss function and a physical consistency constraint loss function.
3. The method for evaluating loading and unloading test of surrounding rock of coal mine spraying support material according to claim 2, wherein the generating a virtual sample data feature vector according to the sample data feature vector comprises: carrying out standardization processing on the sample data feature vector to obtain a standardized sample data feature vector; mapping the normalized sample data feature vector into Gaussian distribution parameters of a potential space with preset dimensionality by using an encoder network; Based on a re-parameterized extraction mode, sampling data in a potential space, introducing standard normal distributed noise into the sampled data, and generating potential vectors; the potential vectors are mapped in the original feature space using a decoder network to generate virtual sample data feature vectors.
4. The method for evaluating loading and unloading test of surrounding rock of coal mine spraying support material according to claim 1, wherein the determining a data feature vector according to the loading and unloading test data comprises: According to the loading and unloading test data of the spraying support material surrounding rock, obtaining a first index value of each test index; Obtaining a second index value of each test index according to loading and unloading test data of the non-sprayed supporting material surrounding rock; determining index value ratios corresponding to the test indexes according to the first index value and the second index value of the test indexes; Determining the evaluation scores of the test indexes according to the index value ratios corresponding to the test indexes; and determining the data characteristic vector according to the evaluation scores of the test indexes.
5. The method for evaluating the loading and unloading test of the surrounding rock of the coal mine spraying support material according to claim 4, wherein the evaluation scores of the test indexes of the uniaxial cyclic loading and unloading test, the uniaxial incremental steady-state cyclic loading and unloading test and the uniaxial incremental step cyclic loading and unloading test comprise evaluation scores of a plastic strain accumulation index, an unloading elastic modulus degradation rate, a loading and unloading cycle number, a uniaxial loading and unloading peak strength, an acoustic emission event rate, a fragment average ejection speed, a fragment average ejection momentum, a fragment average kinetic energy, a sample crushing degree coefficient and a performance discreteness improvement coefficient.
6. The method for evaluating loading and unloading tests of surrounding rock of coal mine spraying support material according to claim 3, wherein the gaussian distribution parameters comprise a mean vector and a logarithmic component difference vector, and correspondingly, the step of introducing standard normal distribution noise to the sampled data to generate potential vectors comprises the steps of: According to the mean value vector, the logarithmic variance vector and the randomly introduced standard overall distribution noise, the potential vector is determined by adopting the following calculation formula; Wherein, the As a potential vector of the vector, As a mean value vector of the data set, As the variance vector of the variance, Noise is normally distributed for a standard.
7. The method for evaluating loading and unloading test of surrounding rock of coal mine spraying support material according to claim 3, wherein the step of performing standardization processing on the sample data feature vector to obtain a standardized sample data feature vector comprises the following steps: Carrying out standardization processing on the sample data feature vector, and obtaining the standardized sample data feature vector by adopting the following calculation formula; Wherein, the Normalized evaluation scores for the j-th index, For the evaluation score of the j-th index, Is the average of all samples at the j-th index, Is the standard deviation in all samples at the j-th index.
8. The utility model provides a colliery spraying support material country rock loading and unloading test evaluation device which characterized in that includes: the acquisition module is used for acquiring loading and unloading test data of the sprayed support material surrounding rock and the non-sprayed support material surrounding rock, wherein the loading and unloading test data comprise single-axis circulation loading and unloading test data, single-axis increment voltage stabilizing circulation loading and unloading test data and single-axis increment step circulation loading and unloading test data; the determining module is used for determining a data characteristic vector according to the loading and unloading test data, wherein the data characteristic vector comprises a single-axis cyclic loading and unloading test, a single-axis increment voltage stabilizing cyclic loading and unloading test and a single-axis increment step cyclic loading and unloading test index evaluation score; The processing module is used for inputting the data characteristic vector into an loading and unloading test evaluation model, and outputting a loading and unloading test control effect probability distribution vector of the sprayed support material surrounding rock by the loading and unloading test evaluation model, wherein the loading and unloading test evaluation model is a model which is obtained by machine learning training and used for evaluating the loading and unloading test control effect of the sprayed support material surrounding rock according to the sample loading and unloading test data of the sprayed support material surrounding rock and the non-sprayed support material surrounding rock and takes a single-axis circulation loading and unloading test, a single-axis increment voltage stabilizing circulation loading and unloading test and a single-axis increment step circulation loading and unloading test index evaluation value in the sample data characteristic vector as input; and the evaluation module is used for determining the loading and unloading test control effect level according to the loading and unloading test control effect probability distribution vector.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor when executing the program implements the coal mine spray support material surrounding rock loading and unloading test evaluation method of any one of claims 1-7.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the coal mine spray support material surrounding rock loading and unloading test evaluation method of any one of claims 1-7.

Description

Loading and unloading test evaluation method for control effect of surrounding rock of coal mine spraying support material Technical Field The invention relates to the technical field of coal mine roadway support, in particular to a loading and unloading test evaluation method for a surrounding rock control effect of a coal mine spraying support material. Background In deep mining of coal mines, roadway surrounding rocks are not only subjected to static load and dynamic disturbance of high ground stress, but also are in a repeated loading and unloading stress environment caused by mining activities for a long time. The repeated loading and unloading effect can cause fatigue damage of the rock material, so that the strength and rigidity of the rock material are gradually deteriorated, and finally, disasters such as instability of surrounding rock, rock burst and the like can be possibly induced. Currently, laboratory evaluation methods for spray coating support materials have focused on static or dynamic testing of single load to failure. Although the method can effectively evaluate the peak strength and the deformability of the material under the one-time load, the mechanical behavior of the material under the repeated loading and unloading working condition cannot be revealed. Specifically, the existing evaluation method has the following limitations that the fatigue damage resistance of the material cannot be evaluated, and the monotone loading test cannot reflect the initiation, expansion and accumulation processes of microcracks of the spraying material under the cyclic load and the effectiveness of inhibiting the fatigue damage of surrounding rock. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a loading and unloading test evaluation method for the control effect of surrounding rock of a coal mine spraying support material. The invention provides a loading and unloading test evaluation method for a control effect of surrounding rock of a coal mine spraying support material, which comprises the following steps: acquiring loading and unloading test data of sprayed support material surrounding rock and non-sprayed support material surrounding rock, wherein the loading and unloading test data comprise uniaxial cyclic loading and unloading test data, uniaxial incremental voltage stabilizing cyclic loading and unloading test data and uniaxial incremental step cyclic loading and unloading test data; Determining a data characteristic vector according to the loading and unloading test data, wherein the data characteristic vector comprises a single-axis cyclic loading and unloading test, a single-axis incremental voltage stabilizing cyclic loading and unloading test and a single-axis incremental step cyclic loading and unloading test index evaluation score; The data characteristic vector is input into an loading and unloading test evaluation model, and the loading and unloading test evaluation model outputs a loading and unloading test control effect probability distribution vector of the spraying support material surrounding rock, wherein the loading and unloading test evaluation model is a model which is obtained through machine learning training and used for evaluating the loading and unloading test control effect of the spraying support material surrounding rock, and is used for determining sample data characteristic vectors and single-axis cyclic loading and unloading tests, single-axis increment voltage-stabilizing cyclic loading and unloading tests and single-axis increment step cyclic loading and unloading test index evaluation scores in the sample data characteristic vectors; And determining the loading and unloading test control effect level according to the loading and unloading test control effect probability distribution vector. The method for testing and evaluating the loading and unloading of the control effect of the surrounding rock of the coal mine spraying support material, provided by the invention, further comprises the steps of obtaining a loading and unloading testing and evaluating model, comprising the following steps: sample loading and unloading test data of the sprayed support material surrounding rock and the non-sprayed support material surrounding rock are obtained, a sample data feature vector is determined according to the sample loading and unloading test data of the sprayed support material surrounding rock, and control effect grade labels corresponding to single-axis cyclic loading and unloading tests, single-axis increment voltage-stabilizing cyclic loading and unloading tests and single-axis increment step cyclic loading and unloading test index evaluation scores in the sample data feature vector are determined; Generating a virtual sample data feature vector according to the sample data feature vector, and determining a control effect grade label corresponding to the single-axis cyclic loading and unloading test, the single-axis incr