Bolt and Grouting Combined Reinforced Support Technology of Large Chamber in Deep Mine

Abstract：In order to solve the deep depth of the gateway,the high deformation occured by the mine ground pressure and the serious dynamic pressure,and the difficult reinforced support of the gateway,based on the substation chamber in the first mining block of No.15 seam of Baoan mine with a vertical deep depth of 650～820 m,the ＋315 mine railway roadway and neighbor mine roadway in the mining block of Baoan Mine affected by the mining and excavation,the deep mine pressure theory analysis and the site practices method were applied to analyze the failure features,deformation failure mechanism and the influence factors.A new reinforced support alternative was provided to the mine large cross section,deep depth and dynamic gateway.The results showed that before the any reinforcement measures conducted mithin 4 months,there was serous deformation in the substion of No.1 mining block.Within a half year after the reinforcement measures conducted,the roof convergence value was 35 mm,the convergence between the two side walls was 60 mm and the floor heave was not over 40 mm.Thus the surrounding rock deformation was controlled and the mechanics property and mechanics status of the surrounding rocks along the roadway were effectively improved.