Study on the Mechanism of Water Inrush and Its Disposal Measures in Slope Shaft Tunnel of a Phosphate in Sichuan

With the development of phosphate mining in the deeper area, the hydrogeological conditions of the deposit are further complicated, and the water hazard problem is highlighted, which will not only affect the safe production of the mine, but also increase the mine energy consumption. This paper takes a phosphate mine in a karst water-rich area in Sichuan Province as the research object. The large-scale water inrush accident is analyzed, which was encountered during the construction of the belt slope shaft. It is found out that the water filling source of the slope shaft is atmospheric rainfall and karst groundwater, and the water filling channels are made up of dissolution fracture, mining fracture and structural fracture zone. The instability and damage of the rock mass in front of the working face under the action of high water pressure caused water inrush. Based on the mechanism of water inrush in the slope shaft, the technical measures for water inrush plugging mainly including the collection of surface scattered water + deep drainage + reinforced the surface surrounding and broken surrounding rock + deep plugging are put forward. These research and disposal methods are expected to provide some reference for the prevention and control of water inrush disasters in the same type of water-rich mines.