PERIDYNAMICS SIMULATION OF CRACK PROPAGATION IN SPATIALLY VARIABLE ROCK MASS WITH DEFECTS

Rock mass in the natural state generally contain micro-cracks. As a result,mechanism for the initiation,propagation,development and penetration of cracks in rock mass has always been a hot research topic in rock mechanics. In addition,the spatial variability characteristics of physical and mechanical parameters of rock mass can also affect the strength of rock samples as well as the failure process. In this paper,a new random peridynamics method(RPD) is proposed to simulate the crack propagation and the development process of cracked rock mass under uniaxial compression. This method combines the use and advantages of the peridynamics method in simulating crack development and the random field method in characterizing the spatial variation of material parameters. The presented numerical framework can produce simulation results of well agreement with the real rock mass state. MATLAB is adopted to verify the accuracy of the inclined prefabricated crack modeling. The results show that the proposed method can simulate the crack development process well. In addition,it is proved that the prefabricated crack inclination has great influence on the subsequent crack development. Furthermore,the evolution velocity can be greatly underestimated if the spatial variability characteristic of rock mass material parameters is neglected. Therefore,it is of great importance to determine the reasonable values of random field parameters,especially the coefficient of variation and the horizontal fluctuation range,for determining the strength and damage of rock mass under uniaxial compression.