Abstract: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.