Investigation of Overburden Movement and Ground Stress Behaviour in Multiseam Mining

Abstract In multiple-seam mining, severe deformation of roadways and coal bursts caused by overlying pillars can occur in the lower seams. Overburden movement ground pressure behaviour when mining thick seam below strong roof upper four extracted seams were investigated Tongxin mine, China. The numerical model indicated that abutment stress is affected as suggested bubble cantilever beam models. microseismic monitoring high-energy seismic events large overburden under source dynamic loads. influence pillar on longwall conditions be broken down into three cases: (a) no area, excessive or failure was observed tailgate with medium static loads low loads; (b) single two overlapping pillars, occurred to (c) extreme high These findings provide guidance for roadway layout operations.