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介绍了某邻海基坑工程中三重管旋喷桩与单轴水泥搅拌桩组合式止水帷幕的成功应用。实践证明,这种组合式止水帷幕不但解决了一般单轴搅拌桩在厚砂层地质中垂直度难以保证、咬合不好易形成桩底开叉的难题,又解决了沿海地区涨退潮对旋喷桩施工时水泥浆可能被水流带走难以连续成桩的影响。同时,本工程局部南面区域相对隔水层较薄,设计计算时该区域会形成基坑突涌,因此根据大面积基坑的水文地质情况及基坑渗流计算数据,布置了相应数量的减压井和疏干井,成功避免了基坑的突涌渗流破坏。
This paper introduces the successful application of combined water-proof curtain of triple-tube rotary jet grouting pile and single-shaft cement mixing pile in an adjacent sea foundation pit project. Practice has proved that this combination of water curtain not only to solve the general uniaxial mixing pile in the thick sand geological verticality is difficult to ensure that the bite is not easy to form the bottom fork fork problem, but also to solve the coastal areas Ebb and Tilt During the construction of grouting piles, the grout may be taken away by the water flow, which is hard to be continuously piled. In the meantime, the relatively impermeable aquitards in the south part of the project are relatively thin, and the excavation of the foundation pit will be formed in the design and calculation. Therefore, according to the hydrogeology of the large-area foundation pit and the seepage calculation data of the foundation pit, a corresponding amount of decompression Wells and sparse dry well, successfully avoiding the surge of foundation pit seepage damage.