Research on mechanical properties and crack characteristics of rock mass with a set of discrete fractures
The distribution of cracks in rock has an important influence on the macroscopic and microscopic mechanical properties of rock and the development and evolution of micro-cracks.The macroscopic mechanical parameters such as uniaxial compressive strength,crack initiation strength and damage strength of rock mass containing a group of cracks are studied,and the number and evolution distribution of micro-cracks in rock mass containing a group of fractures are studied to reveal the mesoscopic mechanical response mechanism of crack propagation in fractured rock mass under compression.As the size of the representative elementary volume is several times of the average trace length of the fracture,comprehensively considering the rock model,fracture distribution and computing abilities,the calculation range of the fractured rock mass selected is 15 mX15 m.The rock mass model with a set of discrete fractures shows that the dip angle,trace length have important influences on the macroscopic mechanical properties of fractured rock mass.The rock mass containing only the first group and the second group of fractures has obvious brittleness characteristics and high peak strength,and the brittle failure eventually forms clear macroscopic cracks with clear failure zones.The rock mass containing only the third group of fractures and the rock mass containing the three groups of fractures have obvious plastic characteristics,the shear zone of plastic failure is not as clear as that of brittle failure,and the model shows multi-point comminuted failure.The characteristics of the rock mass model containing three groups of fractures are similar to those of the rock mass model containing only the third group of fractures,indicating that the third group of fractures has the greatest influence on the rock mass.
NETL
NSTL
万方数据
维普
