Numerical Simulation of Blasting Failure Mode of Jointed Rock Mass
LIU Hongyan1,2, ZHANG Jihong3,4
1. College of Engineering & Technology, China University of Geosciences (Beijing), Beijing 100083, China;2. School of Engineering, Tibet University, Lasa 850000, Tibet Autonomous Region, China;3. School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710064, China;4. Xi'an Engineering Investigation and Design Research Institute, China National Non-ferrous Metals Industry, Xi'an 710064, China
Abstract:The finite element method and the discrete element method widely used in practice can not adequately deal with lots of intermittent joints, the fragmentation of rock mass and the rock block movement. Therefore, a new numerical method, the numerical manifold method, is developed for that purpose. In the numerical manifold method, the mathematical mesh and the physical mesh are used to form a manifold element, which can very easily be used to deal with the lots of original joints in the rock mass. Meanwhile, the fracture mechanics principle is used to simulate the propagation of the joint and the crack, and the block movement theory in DDA is used to simulate the block movement. Finally, a calculation example is taken to analyze the difference of failure modes between the intact and jointed rock masses, and the results show that the existence of joints would greatly affect the rock mass blasting failure mode, and its effect is closely related to the joint's geometry distribution and physical and mechanical properties.