Water Flow Features of Aquifer in Mine Auxiliary Shaft of Zhuji Mine and Control Countermeasures

According to the first aquifer (the porous aquifer of the Permian red base rock) in the mine auxillary shaft of Zhuji Mine, after the pr-grouting at the surfa ce ground, the grouting at the shaft sinking face when water flow occurred during the shaft sinking and other measures conducted, the status of the water flow control r equirements could not be met.The paper analyzed the water inrush speciality cause of the aquifer.The results showed that the aquifer of the Permian red base rock was the porous aquifer of the base rock.Under the in-situ surrounding rock pressure, there was a high absorbability between the pore framework of the base rock and the po rous water and the permeability coefficient was 10-510-3 m/d.When the surrounding rock pressure suddenly reduced, the permeability coefficient would be increased by several 100 times and the weak aquifer would be turned to be a high water inrush aquifer with continued water flowing.Thus when the application of the surface powerfu . I pre-grouting and the proper related grouting were all difficult to control the water inrush, the ground freezing and other control measures should be applied.