3D Discrete element approach to the problem on abutment pressure in a gently dipping coal seam

[摘要] Using the discrete element method, the authors have carried out 3D implementation of the problem on strength loss in surrounding rock mass in the vicinity of a production heading and on abutment pressure in a gently dripping coal seam. The calculation of forces at the contacts between particles accounts for friction, rolling resistance and viscosity. Between discrete particles modeling coal seam, surrounding rock mass and broken rocks, an elastic connecting element is introduced to allow simulating coherent materials. The paper presents the kinematic patterns of rock mass deformation, stresses in particles and the graph of the abutment pressure behavior in the coal seam.

[发布机构] Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, 54 Krasnyi pr., Novosibirsk; 630091, Russia^1

[效力级别] 地球科学

[关键词] Abutment pressures;Broken rock;Coal seams;Discrete-element approach;Kinematic patterns;Rock mass deformation;Strength loss;Surrounding rock mass