复杂条件下大断面巷道顶板冒落失稳分析  

Analysis of Roof Caving Instability Mechanism of Large-Section Roadway Under Complex Conditions

作　　者：曾佑富[1] 伍永平[1] 来兴平[1] 魏成[2] 

机构地区：[1]西安科技大学能源学院,教育部西部矿山开采及灾害控制重点实验室,陕西西安710054 [2]神华宁煤有限责任公司枣泉煤矿,宁夏银川750001

出　　处：《采矿与安全工程学报》2009年第4期423-427,432,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(10402033)

摘　　要：以枣泉煤矿12205首采面胶带运输巷顶板冒落控制为背景,采用弹性力学理论计算和数值分析方法,对复杂条件下大断面巷道顶板冒落失稳机理进行分析.结果表明:由锚杆控制的锚固区的膨胀性软岩遇水发生膨胀变形,泥化,导致锚杆拉断,黏结失效,"小结构"失稳.地下水使锚索孔壁围岩强度降低,孔径扩大,致使锚索锚固失效发生脱落;支护形式不耦合,支护参数不合理,导致锚杆、锚索不能共同承载发生变形,锚索载荷应力集中,锚索锚固端发生剪切破坏,锚索被拔出、脱落甚至产生剪切破坏,"大结构"失稳.最后提出了多介质结构耦合控制技术控制巷道顶板围岩稳定性,并在生产实践中取得了良好的防治效果.For roof collapse control of the belt-conveying-roadway of No.12205 working face in Zaoquan coal mine,the mechanism of roof collapse and destabilization of large section roadway under complex conditions is numerically analyzed by elasticity mechanics theory.The results show that the small structure instability of surrounding rock is caused by bolt tensile and cohesion failure because the soft rock in anchorage zone is swollen and melted when it encounters water.The large structure instability is caused by the anchor cable anchorage invalidation,the anchor cable Abscission,the non-coupling structure,and the irrational parameters of anchor cable.Non-coupling of anchor cable and bolt support parameters may lead to shear failure of the anchorage.Finally,the multi-media structure coupling control technology is proposed to control the surrounding rock stability of roadway roof and has obtained a good control efficiency in the production practice.

关 键 词：大断面 顶板冒落 多介质结构耦合控制技术 

分 类 号：TD322.4[矿业工程—矿井建设]