A study of the excess pore water pressure during pile-sinking construction of nodular pile composite foundation
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摘要: 结合宁波轨道交通4号线东钱湖车辆段竹节桩复合地基处理试验段沉桩施工，开展了土体中超静孔压现场测试，并在考虑竹节桩竹节间空隙对竖向超静孔压分布影响的基础上，推导建立了竹节桩沉桩引起的竖向孔压离散化计算公式。利用建立的离散化计算公式对2 m桩间距试验工况的孔压进行计算，并将计算结果与测试结果进行对比，结果表明：计算结果与实测结果较为吻合，考虑竹节空隙影响的竖向超静孔压计算理论可以较好获得竹节桩沉桩施工引起的超静孔压，可为竹节桩的设计和施工提供依据。Abstract: In combination with the pile-sinking construction of the experimental section of the nodular pile composite foundation at the Dongqian Lake depot of Line 4 of the Ningbo rail transit line, an excess pore water pressure test was conducted and the influence of nodular inter-joint voids on the vertical pore water pressure was considered. The theory of calculating the discretization of the vertical distribution of excess pore pressure caused by nodular pile sinking was deduced. The established theory was used to calculate the 2 m pile spacing test conditions, and the calculation results were compared with the test results. The calculated results were in good agreement with the measured results. Considering the vertical excess static pore pressure calculation theory influenced by the nodular joints, nodular can be better described. The excess pore water pressure caused by the construction of piles can provide design and construction parameters for the pile foundation.
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Key words:
- nodular pile /
- pile-sinking construction /
- excess pore water pressure
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