The original water inrush coefficient of the floor aquifer of the 9303 working face of Xipang well is 0.094～0.126 MPa/m.The high confined aquifer seriously threatens the safe production of the working face.The method of theoretical analysis is used to determine the design depth of reconstruc-tion section of floor confined water for ground regional treatment is 12.0～25.0 m.The thickness of the renovated waterproof layer is 51.0～64.0 m.The water inrush coefficient after renovation is 0.081～0.076 MPa/m.The treatment effect of floor confined water is evaluated through field measure-ment.The results show that the actual reconstruction depth of the floor confined water is 10.7～24.2 m.The actual thickness of the renovated waterproof layer is 50.8～64.3 m.The final pressure of the grouting section is above 6 MPa,and the pump volume reaches below 35 L/min at the end of grou-ting,which meets the grouting standard.The water inrush coefficient after treatment of floor aquifer is 0.073～0.085 MPa/m,less than 0.100 MPa/m,which meets the requirements of safe mining in working face.
关键词
煤炭开采/底板承压水/地面区域治理/隔水层厚度/突水系数
Key words
coal mining/floor confined water/ground regional treatment/thickness of the renovated wa-terproof/water inrush coefficient
维普
万方数据