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液化土体流滑推桩效应的振动台模型试验

DOI: 10.13197/j.eeev.2014.02.246.wangzh.033, PP. 246-251

Keywords: 液化土体,流滑效应,振动台试验,动力反应,摩擦型桩基

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Abstract:

设计并开展了水平和倾斜可液化场地单桩振动台模型试验,考虑桩顶附加质量块、底部嵌固条件以及长径比3个因素,研究了液化土体流滑效应对单桩动力反应的影响。试验观察到场地局部喷水冒砂、土体流滑以及桩身倾斜等宏观现象。分析结果表明单桩在土体流滑推力作用下发生了不对称运动,桩顶加速度反应和桩身拉、压应变的不对称性明显。土体流滑对底部非嵌固、桩顶附加质量块时的单桩动力反应的影响最为显著。基于试验结果我们认为倾斜场地土体流滑对摩擦型桩基的力学作用是负面的,其主要影响体现在加大桩顶附近应变反应以及造成桩身倾斜。

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