含软弱夹层巷道围岩失稳机理及控制技术研究

为解决滇西某铅锌矿在转向深部开采过程中面临的巷道变形失稳加剧与支护结构破坏严重等问题，通过岩石矿物成分分析、地应力测试和松动圈测试分析围岩失稳机理，建立数值模型分析开挖后和现有支护下围岩变形情况。发现研究段属于高应力作用下的急倾斜薄层状破碎岩体，巷道薄弱部位为软弱夹层区域，根据围岩松动圈理论，提出了锚喷+薄弱部位补强+全断面钢拱架主被动联合支护的优化方案，有效控制了围岩变形破坏。研究结果为类似大埋深、高应力、含软弱夹层巷道围岩的稳定性控制提供了借鉴。

Study on instability characteristics and control technology of roadway surrounding rock with weak intercalation

In order to solve the problems of roadway deformation and instability aggravation and serious damage of supporting structure in a lead-zinc mine in western Yunnan Province during its transition to deep mining. The instability mechanism of the surrounding rock was analyzed by rock and mineral composition analysis, in-situ stress test, and loose zone test, and a numerical model was established to analyze the deformation of surrounding rock after excavation and under existing support. It is found that the study section belongs to the steeply-inclined thin layered broken rock mass under the action of high stress, and the weak part of the roadway is the weak interlayer area. According to the loose zone theory of surrounding rock, an optimization scheme of shotcrete + strengthening of weak part + active and passive combined support of steel arch with full section is proposed, which effectively controls the deformation and failure of surrounding rock. It provides a reference for the stability control of roadway surrounding rock with similar large buried depth, high stress, and weak interlayer.