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中文摘要：
福平铁路平潭海峡公铁两用大桥（B0-B58）浅水区有覆盖层承台施工采用钢板桩围堰。通过建立三维渗透模型,将钢板桩视为具有一定渗透性的材料,对钢板桩围堰的渗流问题进行模拟研究,计算分析不同工况下,渗流总水头、压力水头、渗流流速分布及流量和封底砼受力状况。研究表明：钢板桩围堰采用水下混凝土封底,封底砼和钢板桩可以起到较好的防渗效果;采用1 m厚封底砼就可满足本工程防渗要求;封底砼底部的总水头、孔隙水压强随封底厚度增大而增大。研究结果对类似工程钢板桩围堰防渗的设计和施工具有参考和指导意义。
英文摘要：
The cushion cap in shallow water with a covering layer, which is of the highway and railway combined bridge over the Pingtan Strait （B0-B58） of Fuzhou-Pingtan Railway, adopts steel sheet pile cofferdam for construction. The paper establishes the three-dimensional percolation model of the steel sheet pile cofferdam, in which the steel sheet pile is deemed as a certain permeability material, and simulates the steel sheet pile cofferdam seepage problem, calculates and analyzes seepage total head, pressure head, seepage flow velocity distribution and force of the subsealing concrete in different condi- tions. The results show that： Firstly, the steel sheet pile cofferdam can play a good anti-seepage effect by using subsealing concrete and steel sheet pile. Secondly, it can meet the requirements of the project, with 1 m thick subsealing concrete. Thirdly, the total head and pore water pressure at the bottom of the subsealing concrete will be increased along with rising thickness of the subsealing concrete. The results can guide the design and construction of similar projects in seepage prevention of steel pile cofferdam.
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