Numerical Simulation of Non-linear Joint Using Displacement Discontinuity Method

An iterative algorithm for modeling of non-linear joint by the displacement discontinuity method （DDM） was described, and the effect of the non-linear joint on the in-situ stress field was investigated in this paper. The Barton-Bandis （BB） non-linear joint model and failure criterion were adopted in the new DDM program. Using this program, the stress field around the non-linear joint was obtained, the parameters analysis of the joint was carried out, and the deformation and stress distribution of the joint were studied. The simulation results show that： （ 1 ） the in-situ stress is significantly affected by the joint; （2） the increase of stiffness, friction angle, and thickness of the joint affect the stress concentration in different ways; （3） the influence distance of the joint changes with the angle of the joint; （4） the deformation and stress of the joint change with the point position.