STUDY ON GROUTING PLUGGING TECHNOLOGY OF GUSHING WATER IN KARST PIPELINE

In the process of excavation of the karst area, the karst pipeline flooding muddy mud seriously affected the normal construction of the foundation pit. According to the example of the karst gushing water treatment project in the deep foundation pit of Yan'an Road, Guiyang Metro Line 2,technology has been studied. Based on the understanding of the hydrogeological characteristics of the karst gushing water area, the plugging method is adopted to select the appropriate grouting material and matching technology to realize the sealing of the gushing water. In the actual grouting work, summed up the experience of the previous grouting failure, the groundwater source and channel for in-depth analysis, on this basis to adjust the grouting design and implementation of the program, and finally through the drilling of auxiliary grouting hole, Karst groundwater connection channel for double liquid grouting to achieve a successful water shutoff. Grouting process control and scheme adjustment have reference for karst pipeline gushing in similar foundation pit engineering.