文献类型：期刊文献

中文题名：饱和地基下桩柱结构地震响应

英文题名：Seismic response of piles structure in saturated soil foundation

作者：杨章锋[1,2];张卫平[3]

机构：[1]广东海洋大学海洋工程学院,广东湛江524088;[2]河海大学港口海岸与近海工程学院,江苏南京210098;[3]大连理工大学港口海岸与近海工程国家重点实验室,辽宁大连116024

年份：2017

期号：5

起止页码：143

中文期刊名：水运工程

外文期刊名：Port & Waterway Engineering

收录：北大核心2014、北大核心

基金：广东海洋大学创新强校工程科研项目(GDOU2016050258)

语种：中文

中文关键词：两相饱和土;超孔隙水压;桩-土耦合;选择性滤波

外文关键词：two-phase saturated soil; excess pore water pressure; pile-soil interaction; selective filtering

中文摘要：通过建立两相饱和地基下桩-土耦合系统的动力分析有限元数值模型,对饱和自由场地基以及桩柱结构在地震作用下的动力响应进行数值模拟研究。结果表明:在地震作用下超孔隙水压沿深度方向呈现出指数衰减趋势,在地表处更易导致地基液化从而散失承载能力。随着超孔隙水压的上升土体强度降低后,饱和地基土层对地震波的高频成分有明显的选择性滤波作用。在桩柱结构地震响应分析中,受桩土间动力耦合作用的影响,桩侧土体比远场地基土更易液化。随着地基承载力的降低,导致桩柱动力以及弯矩响应上升。研究结果与已有桩基础震害经验相符,其方法和结论可对饱和可液化地基抗震工程提供参考。

外文摘要：Through the developed FEM model of pile-soil coupled system with two-phase saturated soil foundation, the seismic simulation of a saturated free field and a pile structure are carried out in this paper. The results indicate that the distribution of excess pore water pressure shows exponential attenuation pattern from ground surface, the soil near the ground surface more tends to be liquefied and loses beating capacity.Along with the rising of excess pore water pressure and the corresponding degradation of soil strength, the saturated free field shows obvious selective filtering of the high-frequency components in earthquake wave. In the seismic response of pile structure, owing to the coupled pile-soil interaction, the surrounding soil more tends to be liquefied.The decrease of foundation＇s bearing capacity leads to larger seismic response and bending moments of structure piles. The conclusions derived in this paper agree with practical engineering experiences, and the numerical method and conclusions could provide some guidance for seismic design of structures in liquefiable saturated soil foundation.