关键词: 深部巷道, 地面定向孔, 超前治理, 高承压灰岩水, 断层破碎带, 推覆体

Abstract: Water disasters and broken surrounding rock are the main hydrology and engineering geological problems faced by deep roadway excavation under high water pressure and high in-situ stress.Taking the 87 mining area of Zouzhuang Coal Mine in Huaibei as the research object, directional multi-branch borehole along roadway exploration and subsection high pressure grouting technology are proposed to treat roadway group passing through aquifer and fault fracture zone.The spatial location and morphology of the Taiyuan Formation limestone and fault fracture zone are identified.A water-repellent zone is formed around the roadway through segmented high-pressure grouting, and the effective treatment range of the aquifer is greater than 30m. After treatment, the water yield of the verified drilling hole is reduced by about 50%, and the maximum water inflow of a single hole is less than 2m3/h. High pressure split grouting consolidated the fault-broken rock mass, the shotcrete and bolt support was used to pass through the fault zone, without slicing and roof falling. Directional multi-branch hole grouting technology is an effective means to solve the problems of broken surrounding rock and water damage faced by deep buried roadway excavation. The concept of disaster control has been transformed from underground treatment to surface treatment, from treatment while digging to treatment before digging, and from section to region. It has a wide application prospect in the field of advanced treatment of roadway penetrating large fracture or high confined aquifer