DDM Analysis of the Effect of Non-Linear Structural Plane on In Situ Stress Field

Based on the Barton-Bandis non-linear deformation structural plane model, displacement discontinuity method (DDM) is used to iteratively calculate the distribution of in-situ stress field around the structural plane, and then the parameter sensitivity analysis of the structural plane and rock is carried out. The results show that near the structural plane, especially near the tips, stress concentration is quite significant, the closer to the tips, the greater the principal stress difference is; the stress concentration around the structural plane decreases as the stiffness of structural plane grows; with the growth of the ratio of structural plane thickness to length, the stress concentration around the structural plane increases, but when reaching a certain level, the increasing slows down; as the friction angle of the structural plane grows, the stress concentration decreases.