Study on the rational width of coal pillars for protecting roadway in fully mechanized top caving mining face

摘要

In view of the occurrence condition of soft roof and floor with hard 5#coal seam in Xinbai Colliery of Huating Coal Ltd. Corp., the stress distribution and its failure characteristics in adjacent rocks of roadway were studied with respect to different pillar widths using theoretical analysis and numerical simulation. Through general analysis and assessment on stability of the roadway protected by the pillar with different widths, the reasonable pillar width was determined for roadway driving along gob between adjacent mining panels, which provides a reference to the determination of reasonable position of similar roadway driving along gob.