The failure law and support technique for fully-mechanized top-coal caving working face in extra-thick coal seams in deep coal mines

摘要

The failure mechanism of haulage gate surrounding rock in 402103 fully-mechanized topcoal caving face of some deep coal mines of Bin-Chang Mining Region in Shan-xi province are studied.The results show that haulage gate surrounding rock in deep coal mine has the characteristics of big deformation, asymmetry stress distribution of surrounding rock complex.Based on the support idea, which is first pressure released, second pressure relief, third anti-pressure, support and on-site monitoring program for haulage gate in 402103 fully-mechanized top-coal caving face is carried out.The practice shows that the design support parameters of crossheading are reasonable, and the supporting effect meets the needs of safety production.