TECHNOLOGY OF GROUNDWATER CONTROL COMBINATION OF GROUTING AND WATER PRESSURE REDUCE OF SHALLOW TUNNEL

The problem of grouting to stop water and reinforce under the condition of dynamic water pressure is an important problem of groundwater control of shallow tunnel with fewer experiences in the aspects of ratio of slurry, grouting parameters of design and construction. Taking the underground water control engineering of a subway connecting passage as the background, combined with the current situation of complex geological conditions, high artesian head, and phenomenon of water inrush, construction technology of joint control scheme of WSS double fluid grouting under the condition of high pressure water head was presented, based on the idea of grouting, pressure decreases, and the control effect of the technology was studied by the method of scene detection and land subsidence monitoring. The results show that the joint control scheme has gained a good effect of grouting and reinforce under the condition of dynamic water pressure, and can ensures that the underground tunnel grouting process smoothly, achieve good groundwater treatment effect and ensure underground tunnel deformation control in a reasonable range.