| 单桩沉桩引起的初始超孔隙水压力及其消散的计算 |
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| 引用本文： | 龚先兵.单桩沉桩引起的初始超孔隙水压力及其消散的计算[J].长沙理工大学学报(自然科学版),2009,6(2):39-43. |
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| 作者姓名： | 龚先兵 |
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| 作者单位： | 湖南省高速公路管理局,湖南,长沙,410001 |
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| 摘 要： | 基于ADINA有限元程序和三维Biot固结有限元理论,定义桩周土为多孔介质材料,以圆柱形空腔体扩张理论为模型,模拟了一实体工程单桩沉桩过程.考虑实体工程的双面排水条件,计算得到了沉桩完成后桩周初始超孔隙水压力沿桩深度及径向的分布规律,同时计算了桩周土体90 d内孔隙水压力的消散状况.在此基础上,对桩周土因超孔隙水压的消散引起的再固结沉降进行了计算分析,得出的结果与实测结果进行了比较.研究结果表明,考虑弹塑性本构关系和三维渗流固结的有限元模型能较好地模拟沉桩引起的超孔隙水压及其消散过程.
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| 关 键 词： | 沉桩 超孔隙水压 消散 有限元 |
Inititial excess pore-water pressure developed during single pile driving |
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| GONG Xian-bing.Inititial excess pore-water pressure developed during single pile driving[J].Journal of Changsha University of Science and Technology:Natural Science,2009,6(2):39-43. |
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| Authors: | GONG Xian-bing |
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| Institution: | Hunan Expressway Administration Bureau;Changsha 410001;China |
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| Abstract: | The negative skin friction will affect the bearing capacity of the pile.The process pile-driving is simulated as cylindrical cavity expansion based on ADINA and three-dimension Biot's consolidation theory.Soil around the pile is defined as porous media material.the dissipation of the excess pore pressure and the settlement of soil around the displacement pile after driving the pile are analyzed and some conclusions are obtained.In addition,the test results were compared and the FEM model considering Elasto-... |
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| Keywords: | pile driving excess pore pressure dissapation finite element |
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