Abstract: The artesian water head condition is an important feature of the deep excavation projects in this area, which is close to the sea and close to the river. In the process of construction, it is a common and extremely difficult problem mitigating the water and sand burst hazards. This paper presents a case a deep excavation project in Qingdao. In the process of the excavation support design, the local experience of setting a seepage stop curtain between and behind the soldier piles was adopted to minimize the problems of separate row of water stop curtain which is difficult to adopt effective remedial measures in the later stage. At the same time, combined with the concept and measures of the sand burst control before the water plugging, the quicksand is controlled by embedding the drainpipe, filling the flexible materials such as quilts and thermal blankets, and tamping in the rigid materials. The double liquid slurry is poured through the reverse pressure of the drainpipe to achieve the purpose of water plugging. It has successfully resolved the problems in the region, and also provided the valuable experience for reference for the mitigation of similar engineering hazards.

Key words: High-Pressure Jet Grouting Columns, Sand Burst Control, Water Plugging, Double Liquid Slurry, Pressure Injection