Experimental Research on Shear Performance of Coal Containing Gas Under Different Gas Pressure

摘要

Coal containing gas is porous material. In this paper, by using the self-developed meso shear test equipment for coal or rock containing gas, shear crack propagation process of coal under different gas pressure conditions was studied, and shear performance of coal containing gas under different gas pressure was also researched. The results show that the gas pressure can hasten the crack growth rate of shear fracture surface, reduce the shear strength of coal containing gas, and accelerate its shear failure fracture process. The shear breaking process of coal results in two cracks: shear crack and tensile crack, and the cracks first appeared in the shear plane at both ends, then extension to the central until shear fracture surface formed.