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| Study on the influence of cyclic confining pressure on rock deterioration and seepage characteristics under different initial damage degrees |
| ZHANG Peisen1，2，XU Daqiang1，2，YAN Wei1，2，HU Xin3，ZHANG Xiaole1，2，DONG Yuhang1，2，FANG Jiaxin1，2 |
| (1. National Key Laboratory for Mine Disaster Prevention and Control，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. National Demonstration Center for Experimental Mining Engineering Education，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；3. Northwest Electric Power Design Institute Co. Ltd. of China Power Engineering Consulting Group，Xi?an，Shaanxi 710075，China) |
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Abstract In order to explore the law of deterioration and damage of roadway surrounding rocks and to clarify the water inrush mechanism of roadway spalling，laboratory tests on deterioration and seepage characteristics of sandstone under three stress paths of conventional triaxial(group C)，conventional discharge of confining pressure(group W) under different initial damage degrees，and cyclic loading and unloading confining pressure discharge(group X) were carried out based on Rock Top multi-field coupling tester. The results show that：(1) At the beginning of cyclic loading and unloading confining pressure of group X rocks，the axial deformation of rocks is slower than the lateral and volume deformation，but cyclic loading and unloading confining pressure can lead to “ strain accumulation ” of rock，which makes the stress drop point of rock in group X appears “hysteresis effect” compared with group W. (2) The initial damage significantly affects the rock strength and the sensitivity to the confining pressure. The initial damage degree of rocks in group X and group W is negatively correlated with the unified confining pressure drop parameter( )，and positively correlated with the incremental ratio of the strain and the confining pressure( ). The parameter of group X is smaller than that of the group W，while is greater than that of the group W. (3) Obvious brittle failure of rocks occurs in groups X，group W and group C，and the main failure mode is shear failure. When the initial damage degree is low，the rock failure degree of group X is large，accompanied by local macroscopic cracks. (4) The rock permeability is affected by the factors such as rock pores，framework structure and crack development. The rock seepage-strain relationship curves of groups X and group W can be divided into three stages. The first and third stages are consistent. In the second stage，the rock permeability of group X decreases first and then increases，while the rock permeability of group W increases as a whole. (5) The permeability fluctuation of group X tends to be obvious with the increase of the circulation grade. The higher the initial damage degree is，the more easily this phenomenon occurs. The number of cycles has little effect on this law，but the increase of the number of cycles has an inhibition effect on rock seepage，and the inhibition effect is more significant than that caused by the decrease of confining pressure.
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2023, Vol. 42 
