基于FLAC3D液化土中桩基侧向动力特性数值模拟研究*
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（1 河北工业大学土木工程学院， 天津 300401； 2 河北省土木工程技术研究中心， 天津 300401）
［摘要］强震作用下的桩基动力响应一直是土动力学和岩土工程抗震领域研究的热点。基于液化土中的桩基振动台试验，采用有限差分软件FLAC3D进行数值模拟，并将模拟结果与试验结果进行对比分析。结果表明，在正弦波工况下随着输入波峰值加速度的增加，桩基横向动力响应明显，尤其是当输入峰值加速度为0.15g时砂土发生液化，桩基横向动力响应达到最大，模拟结果与试验结果非常接近；在El Centro地震波输入下，加速度时程曲线形状和数值大小在不同的时刻略有差异，而位移时程曲线形状和数值大小吻合较好；同时，两种工况下的孔压比时程曲线也吻合较好，试验孔压比略有下降而模拟孔压比下降不明显，模拟孔压比在前期比试验孔压比小一些。［关键词］振动台试验; 液化土; 动力特性; FLAC3D; 数值模拟中图分类号：TU473 文献标识码：A 文章编号：1002-848X(2015)21-0070-04
Numerical simulation study on lateral dynamic characteristics of pile foundation in liquefied soil based on FLAC3DLi Yurun1,2, Wang Xiaoyan1, Luo Xiang1(1 College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China; 2 Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China)Abstract: The dynamic response of pile foundation under the strong earthquake action has been a hot research issue in seismic fields of soil dynamics and geotechnical engineering. Based on the shaking table test of pile foundation in liquefied soil, the finite difference software FLAC3D was used to carry out numerical simulation and the simulation results were compared with the experimental results. The results show that the lateral dynamic response of pile foundation is obvious with the increase of the wave peak acceleration under different working conditions input by sine wave. The sandy soil is liquefied and the lateral dynamic response reaches the maximum especially when the peak acceleration is 0.15g.Under El Centro earthquake wave input, the shape and the numerical value of the acceleration time history curve are slightly different in different time, and the shape of the displacement time history curve is in good agreement with the numerical value. The lower pore pressure ratio in experiment decreases slightly and the decline of the pore pressure ratio in simulation is not obvious. The pore pressure ratio in simulation is smaller than thatin experiment in the early time.Keywords: shaking table test; liquefied soil; dynamic characteristic; FLAC3D; numerical simulation
*国家自然科学基金资助项目（51008110），河北省自然科学基金资助（E2013202118），中国博士后科学基金资助项目（2014M561169），河北省住房和城乡建设厅（2014-231）。作者简介：李雨润，博士，副教授，Email：iemlyr7888@163.com。
