Cyclic shear tester and test method for rock mass structural planes

Abstract

The invention provides a cyclic shear tester for rock mass structural planes. The cyclic shear tester comprises a basic support system, a cyclic load system, a normal-direction load system and a sheartest system. The cyclic load system, the normal-direction load system and the shear test system are mounted in the basic support system, continuous cyclic shear load can be provided to tests by the cyclic load system, stable normal-direction load can be provided to the tests by the normal-direction load system, rock mass structural plane test specimens can be protected by the shear test system, and the shear test system can be used for carrying out cyclic shear tests. The invention further provides a test method implemented by the aid of the cyclic shear tester. The test method includes mounting the test specimens; applying stress; modulating amplitudes and frequencies; carrying out cyclic shear; computing dynamic shear stress; analyzing data. The cyclic shear tester and the test method have the advantages that the shortcoming of discontinuity defects of the traditional methods can be overcome by the aid of the cyclic shear tester and the test method; the test amplitudes and frequencies can be regulated and controlled, and the test efficiency and precision can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of rock mass mechanics tests, in particular to a cyclic shear test device and test method for rock mass structural surfaces, which are mainly used for testing the mechanical parameters of rock mass structural surfaces under vibration loads. Background technique [0002] The deformation and failure of engineering rock mass is mainly controlled by the strength characteristics of the structural plane of rock mass. During the construction and operation of large-scale rock mass engineering, it is often affected by blasting load and earthquake load, which are both vibration load and cyclic load. A large number of rock mechanics tests have shown that under the action of cyclic loading, the undulation angle of the rock mass structural surface gradually degenerates, the roughness gradually decreases, and finally manifests as the gradual deterioration of the strength characteristics of the rock mass structural surface...

AI Technical Summary

Problems solved by technology

However, the existing studies all adopt the traditional direct test method of the rock mass structural surface, and realize the cyclic shear test through multiple reciprocating direct shears, which has the following disadvantages: 1. The cyclic shear is realized through multiple reciprocating direct shears, and the test process is divided into two parts: 2. The test process cannot consider the influence of the cycle frequency of the vibration load on the test results; 3. It is difficult to accurately control the amplitude of the cyclic shear during the test process.

At the same time, through searching, there is currently no test instrument that can be used to carry out continuous cyclic shear tests on rock mass structural planes

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