Technology and Construction of Water Stopping of Curtain Grouthing in Karst Tunnel——Taking Jinzishan Tunnel of Yichang-Wanzhou Railway for Example

In tunnel construction in rich water karst area,the karst ground water all around the tunnel will cause the change of the engineering geological and the hydrogeological conditions of the tunnel body,reduce the intensity of rock mass,increase the percolating pressure of water,and possibly create the sudden breakthrough accident of water and soil around the tunnel.The curtain grouting technology will be a effective technology of water-stopping in the underground project construction for tunnel and so on.Taking Jinzishan Tunnel of Yichang-Wanzhou Railway for example,the principium of the curtain grouting technology for water-stopping of the tunnel is introduced,the construction organization,the mechanical devices and the personnels of the curtain grouting are exhaustively introduced,and the liquid quantity calculation of curtain grouting and the security thickness of liquid-stopping wall are emphatically discussed,The successful experiences of the curtain grouting technology for water-stopping in Jinzishan Tunnel may provide the technical data and the references for the similar projects.