Evaluation method for jointed rock performance and bolting and grouting effects under compression-shear condition

Abstract

The invention discloses an evaluation method for jointed rock performance and bolting and grouting effects under a compression-shear condition. The method comprises the following steps that all factors influencing compression-shear performance of rock are determined, and an orthogonal test scheme is designed according to experience levels of all the factors; a tested part matched with a compression-shear testing machine is manufactured, and compression-shear testing is carried out; a monitoring system is utilized for monitoring the tested part, the whole fracturing process of the jointed rock is recorded, all the factors in monitoring data are analyzed, the specific value of corresponding rock mechanical parameters of a comparison set and a standard set serves as an evaluation index to carry out statistic analysis on the orthogonal test data to obtain the remarkable influencing factors of the compression-shear performance and obtain the parameter range of each related factor of optimal compression and shear resistance; the corresponding relation between different levels of all the remarkable influence factors and the evaluation index of the certain compression and shear resistance or the bolting and grouting effects is obtained, and design and implementation of the geotechnical engineering supporting and bolting and grouting scheme can be guided.

Description

technical field [0001] The invention belongs to the technical field of rock mechanical performance testing and the technical field of safety in geotechnical engineering, and in particular relates to an evaluation method of jointed rock mass performance and anchor grouting effect under compression-shear conditions. Background technique [0002] The weak surface of the rock mass comes from a large number of discontinuous structures such as joints and fissures in the rock mass. Under the action of stress and complex effects of water, these joint structures have a great impact on the mechanical behavior and stability of rock mass. [0003] Moreover, according to statistics, more than 90% of rock mass slope failures are related to groundwater penetration, 60% of mine accidents are related to groundwater action, and 30%-40% of hydropower project dam failures are caused by seepage. Therefore, it is necessary to study the law of movement and destruction of fracture seepage. [000...

AI Technical Summary

Problems solved by technology

[0006] 1. The current experimental methods cannot obtain the law of the influence of various factors of the joint structure on the mechanical behavior and stability of the rock mass

[0007] 2. The current experiments are unable to study the relationship between the movement law of fracture seepage and rock mass failure

[0008] 3. At present, there is no comprehensive experimental method to study the various influencing factors of grouting and anchoring, especially the research on grouting and anchoring experiments for jointed rock mass and water-bearing rock mass under complex compressive-shear stress state

At present, the shear test at home and abroad usually adopts the direct shear method, and the corresponding compression-shear test also uses a fixed shear box. Because the size and joint position of the rock mass specimen during the cutting process are not easy to control, and the test loading process The position of the parts is prone to slipping, resulting in the deviation of the obtained rock mechanics parameters from the actual ones.

Moreover, there is a bending moment in the loading process of the traditional shear test, which also leads to inaccurate test data

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