Abstract: At present,local roadway collapse phenomenon is serious,which is mainly caused by the development and expansion of internal fractures in rock mass,which further leads to the failure of rock mass due to the loss of self-stable equilibrium ability. In order to explore the influence of fracture geometry parameters on rock mass strength and failure mode,the uniaxial compression simulation of rock mass was carried out by combining discrete element software (PFC) with fracture network. The results show that the compressive strength of rock mass shows a negative correlation and U-shaped distribution trend with the increasing of fracture density and dip angle in fractured rock mass,and the rock mass has the lowest compressive strength when the dip Angle is 45°. The failure mode of rock mass is affected by the form of fracture,and the parallel fracture has a great influence on the rock mass. The research results reveal the development law of fractures in rock mass to a certain extent, which is also the key factor affecting the strength of rock mass. It has a certain reference significance to explore the stability and failure process of fractured rock mass in engineering.

Key words: particle flow,fracture network,uniaxial compressive test,numerical simulation