层状饱和土中部分埋入单桩的水平振动响应  

Horizontal dynamic response of single pile partially embedded in layered saturated soil

作　　者：刘圆圆[1] 孙箭林[2] LIU Yuanyuan SUN Jianlin(Jiangxi College of Construction, Nanchang 330200, China Jiangxi Normal University, Nanchang 330022, China)

机构地区：[1]江西建设职业技术学院,江西南昌330200 [2]江西师范大学,江西南昌330022

出　　处：《世界地震工程》2016年第4期284-292,共9页World Earthquake Engineering

摘　　要：研究了层状饱和土中部分埋入单桩在水平简谐荷载作用下的动力响应问题。基于Biot波动方程和Novak薄层法原理,在求得层状饱和土半空间位移和应力基本解的基础上,利用桩-土变形协调条件和桩单元间位移、转角、弯矩和剪力的连续性条件建立了桩身刚度矩阵方程,导出了水平稳态谐振下部分埋入单桩阻抗函数的封闭形式解答,并获得了桩身弯矩分布形式。将所提退化解与已有成果进行了对比,验证了理论推导的正确性。参数分析表明:埋入比、土层分布、表层土厚度和渗透系数对桩顶阻抗影响显著,但表层土厚度和渗透系数超过特定值后则其影响较小。Based on Biot＇s three-dimensional wave theory, the dynamic response of single pile that is partially embedded in layered saturated soil and subjected to horizontal harmonic load were studied. The horizontal fundamental solutions in half space was obtained by Novak thin-layer method. The matrix equations to describe the stiffness of the pile were deduced from continuity condition （ the continuity of displacement, rotation, shear force, bending moment of element ends） of pile element and the compatibility between the pile and the soil. The closed solution of impedance function of single pile partially embedded in soil under action of horizontal stationary harmonic vibration was derived . The good agreement is found between the degenerated solution presented in this pape and the existing results, which verify the correctness of the method. Parametric analysis shows that the embedded ratio, soil layer distribution, thickness of surface layer and permeability has an obvious influence on impedance at top of pile, but the last two factors have smaller infulence when they are larger than certain values.

关 键 词：层状饱和土 单桩 水平荷载 动力响应 

分 类 号：TU473[建筑科学—结构工程]