ABSTRACT
The numerical approach to translatory coal bumps analysis is used to examine the effects of joint and coal seam stiffness on the outburst velocity, deformation magnitude of the opening wall. A series of tests are performed by varying the joint dip angles, spacing normal to joint tracks, joint block size and coal seam stiffness ratio to the surrounding rock. Results of simulation indicate that coal bumps conditions deteriorate as the dip angle rotated to 90 degree. The increasing of interval spacing and joint block size can cause larger roadway deformation but lower velocity. Higher stiffness ratio can also result in larger deformation, higher deformation velocity of opening wall.
