岩溶隧道帷幕注浆止水技术及施工——以宜(昌)万(州)铁路金子山隧道为例

强岩溶区隧道施工中,隧道周边一定范围内的岩溶地下水在隧道施工中将导致隧道岩体工程地质和水文地质条件发生变化,造成围岩强度降低,渗透水压力增加,并可能造成隧道的突然涌水和突泥事故,帷幕注浆是隧道等地下工程施工中防渗止水的有效技术。以在建宜昌-万州铁路金子山隧道为依托工程,在介绍隧道帷幕注浆目的、注浆止水的机理基础上讨论了金子山隧道帷幕注浆止水施工工艺和注浆施工方案,详尽介绍了帷幕注浆的施工组织、机械设备和人员的配备,并就帷幕注浆中注浆量的推算和止浆墙的安全厚度进行了重点探讨,金子山隧道帷幕注浆的成功经验可为同类工程的施工提供技术资料和经验借鉴。

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 waterstopping 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.