On Grouting Techniques for Preventing Water Inflows in Karst Tunnels
(1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031;2Center for Geotechnical and Structural Engineering Research, Shandong University, Jinan 250061)
Abstract：
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 inflow 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.
2015, Vol. 52 