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受相邻大型综放面剧烈采动影响,大断面综放沿空煤巷掘进过程中易出现冒顶、垮帮、支护体损毁等强矿压现象,导致巷道不能安全畅通。以王家岭煤矿20102回风巷道为研究对象,采用现场调研、理论分析、数值模拟、井下试验等手段进行变形破坏机制分析,认为其变形破坏的主要因素有:高支承压力,围岩裂隙发育、强度低,大断面,支护不合理。得出巷道变形破坏动态过程为:大型综放开采→大范围高支承压力、高强度应变能积聚→巷道开挖导致应变能剧烈释放→围岩结构劣化和强度丧失→(支护不利、大断面等)巷道严重失稳破坏。在上述研究基础上,提出巷道掘进期间和回采期间围岩控制对策与技术,并结合现场地质生产条件确定支护方案。现场实践表明,采用综合控制技术后,顶板变形量为136 mm,两帮变形量为116 mm,底板变形量为132 mm,处于稳定状态。
Affected by the drastic mining of adjacent large-scale mechanized caving and mining face, the strong pressure of roof fall, collapse and support body is prone to occur during excavation of gob-side entry of large section fully mechanized coal caving, which leads to the roadway can not be safe and smooth. Taking the 20102 return airway in Wangjialing Mine as the research object, the deformation and failure mechanism was analyzed by on-site investigation, theoretical analysis, numerical simulation and downhole test. The main factors of deformation and failure were as follows: high bearing pressure, Low strength, large section, support unreasonable. The dynamic process of deformation and failure of roadway is concluded as follows: large-scale fully mechanized top-coal caving → wide range of high bearing pressure and accumulation of high-intensity strain energy → severe excavation of roadway leading to severe release of strain energy → deterioration of structure and strength loss of surrounding rock → (unsupported, Etc.) Roadway serious instability damage. Based on the above research, the control measures and technologies of surrounding rock during tunneling and during the mining are put forward, and the supporting scheme is determined according to the geological conditions of the site. The field practice shows that the roof deformation is 136 mm, the deformation amount of the two gangs is 116 mm and the deformation of the bottom plate is 132 mm, which is in a steady state after adopting the integrated control technology.