关键词: 逆断层, 应力场, 有限差分法, 有限元, 接触模型

Abstract: We study:(1) A nonlinear model of thrust movement-a contact model, (2) The methods of explicit and implicit calculation of thrust stress field, (3) Thrust stress field characteristics from explicit and implicit scheme. We describe a thrust movement model and get stress field near the fault by 2D explicit finite difference method and 3D implicit finite element method, respectively. The results show that (1) the lower part of hanging wall of the thrust is tensile, and the lower part of foot wall is compressive, (2) complicated 3D tectonics can be treated as a series of 2D problems under some limitations, (3) explicit algorithm is better than implicit algorithm when a contact model is used to simulate stress field of active faults.

Key words: Reversed fault, Stress field, Finite difference method, Finite element, Contact model