部分外露悬浮管桩水平动力阻抗分析  

Analysis of Horizontal Dynamic Impedance of Partially Exposed Floating Pipe Pile

作　　者：闫启方 张维维 黄宁宁 刘梦阳 YAN Qifang;ZHANG Weiwei;HUANG Ningning;LIU Mengyang(College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China)

机构地区：[1]信阳师范学院建筑与土木工程学院,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2021年第4期680-685,共6页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(U1504505);河南省高等学校重点科研项目(19B560008)。

摘　　要：将部分外露悬浮管桩下面对应的土体视为虚土管桩,利用Winker弹簧-阻尼器模型来刻画桩周土、桩芯土与管桩的动力相互作用关系,建立了部分外露悬浮管桩的水平振动模型.通过求解桩周土和桩芯土层水平振动,得到了桩周土和桩芯土对部分外露悬浮管桩的水平作用;运用初始参数法和传递矩阵法,得到了部分外露悬浮管桩的水平动力阻抗.数值分析结果表明:管桩下土层厚度较小时,桩端边界条件对部分外露悬浮管桩水平动力阻抗的影响不大;外露部分的桩长影响水平动力阻抗实部和虚部随频率的变化规律;管桩内半径即管桩壁厚和管桩与土体剪切模量比对管桩水平动力阻抗的影响较大,且在低频时的影响规律与频率有关.The horizontal dynamic model of partially exposed floating pipe pile is established by the corresponding soil under pipe pile as virtual soil pipe pile,and the dynamic interactions between the soil around the pile and pipe pile,between pile core soil and pipe pile are described by the Winker spring-damper model.By solving the horizontal vibration of the soil around the pile and pile core soil,the horizontal action of the soil around the pile and pile core soil on the partially exposed floating pipe pile is obtained.The horizontal dynamic impedance of the partially exposed floating pipe pile is obtained by the initial parameter method and the transfer matrix method.The results of numerical analysis show that the influence of the boundary condition at the end of the pile on the horizontal dynamic impedance of the partially exposed floating pipe pile is not significant when the thickness of the soil layer under the pile is small.The length of the exposed part affects the change rule of the real part and the imaginary part of the horizontal dynamic impedance varying with the frequency.The internal radius of the pipe pile(that is,the wall thickness of the pipe pile)and the shear modulus ratio of the pile to the soil have a great influence on the horizontal dynamic impedance of the pipe pile,and the influence law at low frequency is related to the frequency.

关 键 词：悬浮管桩 水平动力阻抗 初始参数法 传递矩阵法 

分 类 号：TU435[建筑科学—岩土工程]