部分外露摩擦管桩的扭转振动研究  

Studies on the Torsional Vibration of Partially Exposed Friction Pipe Pile

作　　者：王士革 闫启方 柳金强 张维维 WANG Shige;YAN Qifang;LIU Jinqiang;ZHANG Weiwei(College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China;Xinyang Municipal Party School of CPC,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 [2]中共信阳市委党校,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2021年第3期489-494,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：将管桩下面土体视为虚土管桩,管桩与桩周土和桩芯土的扭转动力相互作用等效为动力扭转Winkler弹簧-阻尼器,建立了部分外露摩擦管桩的扭转振动模型.考虑土层边界条件,通过求解Bessel方程得到了桩周土和桩芯土对管桩的扭转作用,得到了动力扭转Winkler弹簧-阻尼器的刚度系数和阻尼系数.考虑虚土管桩、埋入部分管桩和外露部分管桩的连续性边界条件,运用初始参数法和传递矩阵法得到了部分外露摩擦管桩桩顶的扭转复刚度.通过数值算例分析和讨论了管桩几何参数、物理参数和土体物理参数对部分外露摩擦管桩扭转复刚度的影响.研究结果表明:管桩下面土层厚度对部分外露摩擦管桩扭转复刚度的影响较小,当埋入部分管桩的长度达到一定程度时,管桩底部约束条件对管桩扭转振动的影响很小;埋入部分管桩和外露部分管桩长度对部分外露摩擦管桩扭转振动的影响较大;部分外露摩擦管桩管壁过薄或桩芯土剪切模量较小时对管桩稳定不利;增大埋入部分管桩对应土层的剪切模量对提高部分外露摩擦管桩的稳定性有利.The soil under the pipe pile is regarded as virtual soil pipe pile and the torsional dynamic interaction between the pipe pile and the soil around pile and the pile core soil are equivalent to the dynamic torsional Winkler spring-damper,the torsional dynamic model of partially exposed friction pipe pile is established.Considering the boundary conditions of soil layer,the torsional action of soil around pile and pile core soil on pipe pile is obtained by solving Bessel equation,and the stiffness coefficient and damping coefficient of dynamic torsional Winkler spring-damper are obtained.Considering the continuity boundary conditions of the virtual soil pipe pile,the embedded partial pipe pile and the exposed partial pipe pile,the torsional complex stiffness at the top of the partially exposed friction pipe pile is obtained by using the initial parameter method and the transfer matrix method.The effects of geometric parameters and physical parameters of pipe pile and the soil physical parameters on the torsional complex stiffness of partially exposed friction pipe piles are analyzed and discussed by numerical examples.The results show that the thickness of soil layer under pipe pile has little effect on the torsional complex stiffness of partly exposed friction pipe pile.When the length of embedded partial pipe pile reaches a certain degree,the restriction conditions at the bottom of pipe pile have little effect on the torsional vibration of pipe pile.The length of embedded partial pipe pile and the length of exposed partial pipe pile have great influence on torsional vibration of partly exposed friction pipe pile.The stability of pipe pile is unfavorable when the wall of pipe pile is too thin or the shear modulus of pile core soil is too small.Increasing the shear modulus of the soil corresponding to the embedded partial pipe pile is beneficial to the stability of the partly exposed friction pipe pile.

关 键 词：摩擦管桩 振动 Winkler弹簧-阻尼器 复刚度 传递矩阵法 

分 类 号：TU435[建筑科学—岩土工程]