发现广场基坑开挖深度大,采用排桩+内支撑支护方式,场地砂层直接至岩层,没有不透水的粘性土层过渡,止水帷幕采用了大直径搅拌桩,由于岩层厚、围护桩入岩工作量大,围护结构钻孔桩采用了长短桩形式,减少了部分入岩量,施工采用泥浆护壁和干成孔工艺,减少了泥浆排放量,对类似深基坑项目有一定参考作用。 It is found that the pit excavation depth of the square is large, and the method of row piles and internal support is adopted. The sand of the site is directly connected to the rock strata. There is no transmissibility of the impermeable cohesive soil layer. The large diameter mixing piles are used in the water stopping curtain. The work load of rock embankment is large, and the long-short piles used for the bored piles in the retaining structure reduce some of the rock mass. The mud retaining wall and dry-forming process are used to reduce the mud discharge. Certain reference effect.