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| Study on the influence of loading system stiffness on post-peak failure of sandstone under unilateral and biaxial constraints |
| WU Xukun1，2，ZHAO Guangming1，2，MENG Xiangrui1，2，XU Wensong1，2，LIU Chongyan1，2，LIU Zhixi1，2，ZHANG Qihang1，2，GAO Yu1，2 |
(1. National Key Laboratory of Safe Mining of Deep Coal and Environmental Protection，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. Key Laboratory of Safe and Effective Coal Mining，Ministry of
Education of China，Anhui University of Science and Technology，Huainan，Anhui 232001，China) |
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Abstract In order to study the influence of deep complex stiffness environment difference on rock mass mechanical behavior，the two-dimensional variable stiffness dynamic failure simulation test system，combined with acoustic emission(AE) monitoring equipment，was used to carry out experimental research on unilateral and biaxial compression of sandstone in different stiffness environments，aiming to discuss the effects of loading system stiffness on the mechanical response characteristics，post-peak rebound deformation characteristics and energy evolution of sandstone under unilateral and biaxial constraints. The results show that：(1) The stress-strain curve of sandstone specimens is significantly affected by the stiffness environment in the post-peak stage. Under the uniaxial conditions，with the decrease of the stiffness of the loading system，the stress drop is faster and more macroscopic cracks are generated. Under the lateral constraints，the stiffness of the loading system has multiple rebound impacts on the rock samples，affecting the fluctuation of the post-peak curve and the fluctuation of acoustic emission(AE) events. It shows a step increase in energy. (2) The stiffness of the loading system is negatively correlated with the stored strain energy of the testing machine frame，the extreme post-peak rebound velocity and the cumulative maximum dissipated energy under unidirectional and bidirectional loading. Lower loading stiffness leads to greater energy release velocity and increases the macroscopic crack and damage degree of the rock sample. (3) Under the control of the stiffness of the loading system，the stored strain energy，post-peak instantaneous rebound velocity and cumulative dissipated energy of the testing machine frame are positively correlated with the lateral binding force，and the lateral constraint conditions enhance the stiffness effect and have a significant impact on the deformation characteristics of rock samples. (4) The low-stiffness environment will produce dynamic impact and energy supply to the rock mass，resulting in dynamic damage and binding force，which can improve the energy storage limit of the rock mass and weaken the damage degree of the rock mass in the rigidity environment.
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2024, Vol. 43 
