岩溶管道涌水的注浆防控技术研究

On Grouting Techniques for Preventing Water Inflows in Karst Tunnels

岩溶隧道涌水地质灾害严重妨碍正常施工,文章以封堵齐岳山隧道底板岩溶涌水为工程实例,对注浆堵水防控技术进行了研究。在充分了解岩溶涌水区域水文地质特征的基础上,树立了注浆区域探测先行的防控理念,借助高精度无损探测技术和高密度地质钻孔手段,掌握了被注介质管道分布和岩溶水径排路径,使注浆孔设计和浆材选择有的放矢。在实际的注浆工作中,总结了浅层化学注浆的失败经验,优化了化学注浆浆液的功能,及时调整注浆设计和实施方案,最终采用水泥浆液进行深层注浆并取得了堵水成功,注浆过程及方案调整对类似隧道工程的底板涌水具有借鉴意义。

The inflow of water may seriously affect normal construction of karst tunnels, therefore the grouting techniques for preventing water inflow in karst tunnels were examined using the Qiyueshan tunnel with water in- flow at the floor as an example. Specifically, the concept of ＂probing before grouting＂ was proposed based on full knowledge of the hydrogeological characteristics of the water inflow area, and the karst channel distribution and the water runoff path were obtained by high-precision nondestructive detection and high-density geological drilling. During grouting, the chemical grout function was optimized by implementing lessons learned from the shallow chemical grouting, and the grouting schemes were adjusted in time to achieve successful deep grouting using cement mortar.