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工程力学  2012 

饱和软粘土中沉桩后桩周土体固结分析

DOI: 10.6052/j.issn.1000-4750.2010.12.0940

Keywords: 软土,沉桩,圆孔扩张理论,修正剑桥模型,固结,解析解

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Abstract:

假定沉桩过程是一个平面应变圆孔扩张问题,采用了修正剑桥模型,给出了软粘土中沉桩过程后初始时刻超孔隙水压力沿桩径分布的解析函数,并与Cao等人的数值解以及Gibson提出的公式进行了比较。根据土骨架的弹性位移特性以及水流的连续性条件,得到了桩周土体固结的控制方程。运用分离变量法并结合边界条件以及初始条件得到了桩周土中超孔隙水压力消散的级数解答,该解答可以作为孔压静力触探反求固结系数的一个理论依据。通过2个算例分析了土体的应力历史以及刚度对桩侧超静孔压消散的影响;算例分析表明,随着超固结比的增大,归一化后的塑性区半径以及桩侧超孔隙水压力均在减小;桩侧的超静孔压消散前期较快,后期较慢。

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