Structural analysis of "roof-pillars" on longwall remaining coal pillars support mining

Medium and small coal mines in north of Shaanxi Province generally adopt longwall remaining coal pillars support mining.Rational area must be divided while mining,through remaining different nature coal pillars group,let coal pillars in isolated area yield and destroy,and overburden stratum develop to form waiting downpour hexahedron from keeping deformation.According to Guojiawan Mine longwall remaining coal pillars support mining,this papersets up the mechanics model of beam,proceeding from angle of mechanics,analyzing the destruction mechanism when the interaction of roof-coal pillars .Mechanics analysis result is identical with the numerical simulation of RFPA2D.Suitable monitoring method is put forward based on analyzed result,the mining has much significant to effectively manage roof,implement the security and high-efficiency.Analytical method of continuous beam may be referred by using extensively strip mining and room and pillar mining of continuous mine coal machine.