Research and Application of Support Technology to Gateway with Soft and Broken Roof

In order to solve the support technical difficulty of the gateway with soft and broken roof in No.15 seam of the Jurassic Period in Datong Mining Area, the physical mechanics property test and measurement was conducted on the seam and the roof and floor strata.Based on the circumstance, the roof type of the gateway W as analyzed.According to the actual conditions of the seam roof, the paper stated the principles of the on time support, the yield support, the high working resistance su pport and the integrated reinforcement for the gateway with broken roof.The theoretical calculation was applied to determine the surrounding rock anchoring support pla n of the seam gateway.The site experiment showed that the support plan and the support parameters selected could be effectively to control the surrounding rock defor mation of the gateway.The max bed separation value of the gateway roof would be 13 mm.The support material consumption was reduced by 10%.Thus the safety appli cation of the gateway could be ensured and the obvious economic benefits were obtained.