Dynamic analysis and numerical simulation of fault slip instability induced by coal extraction
The stress state and mechanical response of fault rock system were analyzed based on "voussoir beam" theory to investigate the rockburst disaster induced by fault slip.The relationship between fault slip as well as key strata breaking and mining process was studied by deducing the normal and shear stress formula.The response of displacement,stress,velocity and energy under different mining factors was compared using numerical simulation.The results show that fault slip shows a different sensitivity to mining.The shear displacement and stress distribution in the fault zone are significantly affected by the friction angle of the fault,depth,location of the fault and mining methods,but faintly affected by fault mechanical properties such as normal stiffness and shear stiffness.Stress path varies greatly at different positions of fault zone and the slip occurs mostly near the fault due to height of overburden failure.The maximum slip velocity and seismic source parameters also show a positive relation with the maximum shear displacement.
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NSTL
万方数据
维普
