Development and application of bidirectional dynamic cyclic shear test system for rock joints
To deeply investigate the shear mechanical behaviors and failure mechanisms of rock in the complex engineering environment,a bidirectional dynamic rock shearing test system was independently designed and developed.The test system is mainly composed of five parts:host loading system,servo oil source system,servo control system,shear tooling system and deformation measurement system.The main innovations of the test system are as follows:(1)Dynamic loading can be carried out in the normal and shear directions at a frequency of 0.001-10 Hz,and the mixed loading and unloading control of tangential displacement,tangential load,normal displacement and normal load can be realized simultaneously.The normal center of the sample can be kept constant by the method of bidirectional shear.(2)Load,cylinder displacement,and deformation sensors are used for multi-rate and multi-objective combination control to achieve tangential and normal dynamic and static loading in the test process;(3)Multiple controllable boundary conditions such as constant stress,constant displacement,constant stiffness,dynamic loading and customized load forms can be realized;(4)Large-size specimens with L× W×H=200 mm× 100 mm× 100 mm or 400 mm×200 mm×200 mm can be researched;(5)The coupling mechanism under various working conditions such as shearing and anchoring can be explored simultaneously.The reliability and accuracy of the test system were verified by carrying out rock shear tests under different stress boundary conditions with this test system.The test results indicate that the developed bidirectional rock joints dynamic shear test system can meet the scientific research needs of rock shear mechanical behavior.The system is easy to operate and the test process is efficient and stable.The loading accuracy and test data accuracy are high.The test system can provide an important platform for research in major engineering fields such as deep coal resource mining,roadway(tunnel)excavation and construction,radioactive nuclear waste disposal,slope stability analysis in earthquake zones and underground energy storage.
rock mechanicsshear testboundary conditionsdynamic loadingdevelopment of testing system
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