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摘要：
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京沪高速铁路苏州西桥段望虞河大桥水中承台封底混凝土底面位于望虞河常水位下16.0 m,河床下土质为强透水性粉砂土,承台封底混凝土承受的静水压力极大。通过对封底混凝土采用三维有限元程序计算,确定了封底混凝土的厚度;根据土质采用水力学渗流计算,决定了是否会出现管涌,并进一步确定承台开挖方法是采用围堰排水后开挖还是水下直接开挖。通过实践证实,上述分析比较准确,有效指导了施工,保证了工程顺利进行。
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The sub-sealing concrete subsurface of the underwater pile caps of Wangyu River Large Bridge,which is located in the Suzhou West Bridge Section of Beijing-Shanghai High-Speed Railway,is 16.0 meters below the normal water level of the Wangyu River.The soil under the waterbed is high-permeable silt,and the sub-sealing concrete of the pile caps is under high hydrostatic pressure.The paper conducted calculations on the sub-sealing concrete using the three-dimensional finite element program to determine the thickness of the sub-sealing concrete and performed hydraulic seepage calculations according to the soil conditions to determine whether piping will occur and whether excavation after cofferdam drainage or underwater excavation is adopted as the excavation method for the pile caps.The actual practices have shown that the analyses are fairly accurate,providing effective guidance for the construction and helping achieving the successful completion of the project.
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基金项目：
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作者简介：
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参考文献：
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[1]CECS 137:2002,给水排水工程钢筋混凝土沉井结构设计规程[S].
[2]李皓月,周田朋,刘相新.ANSYS工程计算应用教程[M].中国铁道出版社,2003.
[3]江正荣.建筑施工计算手册[K].中国建筑工业出版社,2001.
[4]刘杰.土的渗透稳定与渗流控制[M].水利电力出版社,1992.
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