Technology of Secondary Support and Reinforcement with Bolt/Mesh/Cable in Underground Shaft Bunker

According to the frequent damage and repair of coal bunker in Chenjiashan Mine, the authors evaluated the surrounding rock and support status, analyz ed the features and shortcomings of previous reinforcement scheme, and sumed up four influencing factors for bunker failure, including the low strength of surrounding rock, the high abutment pressure of surrounding rock, the poor quality of coal bunker section configuration, and the low self-bearing structure ability and bad support of arch-lining.The authors put forward secondary support plan with bolt/mesh/cable, that is to say, in order to control shallow depth rock deformation, primary support with roof bolting with wire mesh was used.The secondary support with cables support was used to improve the rock strength through support bearing structure formed by firs t support with calbes fixed in deep rock.In comparison with previous support plan, the secondary support could improve the stability of surrounding rock, which not only could reduce the support cost, but also shorten the construction period.