非饱和土地基中端承桩对SH波的水平地震响应  

Horizontal seismic response of end-bearing piles in unsaturated soil foundation under SH waves

作　　者：邹新军[1,2] 杨紫健 吴文兵 ZOU Xinjun;YANG Zijian;WU Wenbing(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education,Hunan University,Changsha,Hunan 410082,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082 [3]中国地质大学工程学院岩土钻掘与防护教育部工程研究中心,湖北武汉430074

出　　处：《岩土工程学报》2024年第1期72-80,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178329);湖南省研究生科研创新项目(CX20230442)。

摘　　要：为探讨非饱和土地基中SH波作用下端承桩的水平地震响应,先基于一维波动理论得出SH波引起的土层自由场水平振动解,然后考虑非饱和土体动剪切模量随其饱和度的变化特性,采用三维连续介质力学和Euler梁模型建立轴向静荷载下非饱和土-端承桩水平耦合振动模型,进而通过引入势函数和分离变量法推导出桩顶水平位移相互作用因子、桩顶水平位移放大因子和桩身曲率比的表达式,经与已有成果对比验证后再经参数分析,获得土体饱和度、桩身长径比和土体黏滞阻尼对桩身水平抗震特性的影响规律:土体饱和度和桩身长径比仅在高频范围对相互作用因子和放大因子有显著影响;土体黏滞阻尼仅在共振频率使得相互作用因子和放大因子分别逐渐增大和减小。In order to study the horizontal seismic response of end-bearing piles in unsaturated soils subjected to SH waves,the free field vibration of soils induced by SH waves is firstly obtained based on the one-dimensional wave theory.Then,considering the dynamic shear modulus of soils to change with saturation,an unsaturated soil-pile coupling vibration model is established by using the three-dimensional continuum mechanics and the Euler beam model.By introducing the potential function and the separation of variables,the expressions for the interaction and amplification factors of horizontal displacement of pile head and the pile curvature ratio are derived,and verified by comparison with the previous research results.Finally,the influences of soil saturation,pile length-diameter ratio and viscous damping of soils on the horizontal seismic characteristics of piles and their variation reasons are discussed.The results show that saturation and pile length-diameter ratio have significant effects on the interaction and amplification factors of horizontal displacement of pile head only in the high frequency range.With the increase of soil viscous damping,the interaction and amplification factors increase and decrease respectively only at the resonant frequency.

关 键 词：端承桩 非饱和土 SH波 水平振动 Euler梁模型 

分 类 号：TU435[建筑科学—岩土工程]