王家岭矿大断面煤巷迎采掘进围岩控制技术研究OA

In view of the problem of severe instability and damage of large cross-section stoping roadways of fully mechanized top-coal caving faces in Wangjialing Mine under the mining influence of adjacent working faces,methods such as field investigation and research,theoretical analysis,industrial testing,mine pressure monitoring and others are comprehensively adopted to systematically conduct a study of the deformation and damage characteristics of coal roadway,the formation mechanism of roof separation layer displacement,the control mechanism of high pretension truss anchor cables,and the technical system of roadway segmented support under strong mining conditions,and engineering verification is carried out in the 20102 return air roadway.The practice shows that after adopting truss anchor cables to coordinate with single hydraulic prop("π"-shaped beam)for joint reinforcement,the convergence values of the roof and floor,as well as the two sides,are decreased by over 80%and 70%respectively compared to the conventional anchor mesh cable support.The average maximum axial force of the truss anchor cables is 76%of their yield damage load,and the working state is stable;The new excavation section adopts a support scheme of truss anchor cable+anchor mesh cable,which has better surrounding rock control effect.The support scheme proposed by the study significantly improves the stability of roadway surrounding rock under strong mining conditions,providing a reliable technical support for the safe and efficient excavation of roadways under similar conditions.