Numerical Simulation of Coal Mining Excavation Based on Discontinuous Deformation Analysis

Abstract

The movement and deformation of rock stratum occur when the excavation is carries out during the underground mining process. Rock is a continuous-discontinuous material so the continuum mechanics method may not handle the rock problem well. The discontinuous deformation analysis (DDA) method which discretizes the rock mass to block system can describe the large displacement and deformation of rock blocks, especially the rock stratum collapse. The DDA was employed in this paper to analysis a mining excavation process. The displacement field and stress field of rock stratum was computed. The result shows that the DDA can handle the mining excavation and the rock stratum movement and deformation problem well.

Improved Gauss Seidel based projection–contraction algorithm for the mixed complementarity problem in contact problem

“…With the development of DDA method, more and more contact problems in theory and engineering have been well-resolved. [17][18][19][20][21][22] For example, Xu et al 23 developed a threedimensional DDA method based on contact potential. And a variational inequality framework was used by Fan et al 24 to reformulate DDA.…”

“…Shi 6 invented the DDA to solve the contact problem of the block system in engineering. With the development of DDA method, more and more contact problems in theory and engineering have been well‐resolved 17–22 . For example, Xu et al 23 .…”