自然崩落法断层作用下巷道开挖稳定性分析  

Stability Analysis of Tunnel Excavation under the Action of Fault in Natural Caving Method

作　　者：王欢 朱俊宁 何翔 游锋 WANG Huan;ZHU Junning;HE Xiang;YOU Feng

机构地区：[1]金诚信矿业管理股份有限公司,云南迪庆674400

出　　处：《中国矿山工程》2023年第1期10-15,34,共7页China Mine Engineering

摘　　要：普朗铜矿采用自然崩落法开采,在三条断层带相互交织影响下,其底部结构发生了变形破坏。探孔数据表明断层下开挖巷道围岩已被破坏,破坏位置一般存在于巷道表面2.5 m、8 m;通过数值模拟可知,巷道应力集中发生在断层与巷道交汇处,而该处也是变形破坏主要区域。根据应力集中及巷道破坏特点,对聚矿道采用单层锚网喷支护,出矿进路采用双层锚网喷+长锚索支护,眉线位置增加钢拱架支护;对应的拉底穿脉断层位置进行支护试验,取得一定效果。该支护方式对地压治理效果显著,研究结果可为同类矿山提供参考。Pulang Copper mine is mined by natural caving method. Under the influence of three fault zones interweaving, the bottom structure of Pulang copper mine is deformed and destroyed. The exploration data show that the surrounding rock of the excavation roadway under the fault has been damaged, and the failure location is generally 2.5 m and 8 m on the roadway surface. It can be known by numerical simulation that the stress concentration of roadway occurs at the intersection of fault and roadway, which is also the main area of deformation and failure. According to the characteristics of stress concentration and roadway failure, the single-layer spray anchor net support is adopted for mine gathering tunnel, the double-layer spray anchor net + long anchor cable support is adopted for mine exit approach, and steel arch support is added at the eyebrow line position. The support test is carried out at the corresponding fault location of pull-down perforating vein, and certain results are obtained. The method has remarkable effect on ground pressure control, and the research results can provide reference for similar mines.

关 键 词：自然崩落法 断层 巷道开挖 数值模拟 稳定性 

分 类 号：TD322[矿业工程—矿井建设]