深部矿井大硐室锚注联合加固技术

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

为解决巷道埋藏较深、受地压及强烈动压影响变形大、补强加固技术的难题,基于保安煤矿15号煤一采区变电所巷道硐室在距地表垂深650～820 m,以及在+315 m轨道大巷等邻近巷道的采掘影响下,采用深埋矿压理论分析与现场实践的方法分析了其破坏特点、变形破坏机理及影响因素,提出了一种对大断面大埋深及动压巷道的新型加固方案。结果表明:一采区变电所在未采取措施4个月内严重变形,采取加固措施后半年内顶板下沉量35 mm,两帮移近量60 mm,底鼓量不到40 mm,控制了围岩变形,有效地改善了巷道周围围岩力学性质和力学状态。

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.