关键词: 切顶卸压, 沿空留巷, 采空区封堵, 表面喷涂, 井下快速运输, 单体支柱

Abstract: Based on the theory of roof cutting and pressure relief along goaf and the practice of Xiangshan mine, taking No.3 coal mine 21311 auxiliary air intake roadway as the research object, a complete set of goaf retaining technology, which integrates roadway support, underground equipment rapid transportation and goaf plugging, is formed around the main influencing factors of roof cutting and pressure relief along goaf. The displacement of the roadway surface and the supporting force of the new single pillar are measured, the law of the surrounding rock and the pressure change of the roadway along the goaf under the technology of roof cutting and pressure relief is studied, and the effect of the new gangue retaining pillar is analyzed. The results show that the supporting pressure of the single pillar is directly proportional to the distance of the working face, the closer it is to the working face, the greater the roadway pressure, and vice versa.