黏弹性地基中螺旋桩水平动力特性  

Horizontal vibration characteristics of screw pile in viscoelastic foundation

作　　者：王超哲 吴进 王立兴 刘浩[1,2] 杨紫健 吴文兵 WANG Chaozhe;WU Jin;WANG Lixing;LIU Hao;YANG Zijian;WU Wenbing(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;Zhejiang Institute,China University of Geosciences(Wuhan),Hangzhou 311305,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国地质大学(武汉)浙江研究院,浙江杭州311305

出　　处：《中南大学学报（自然科学版）》2022年第6期2279-2289,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51878634);浙江省自然科学基金资助项目(LR21E080005);中国科协青年人才托举工程(2018QNRC001)。

摘　　要：为了完善螺旋桩水平振动理论,首先采用等效刚度的方法,将螺旋桩等效为特定桩径的传统直桩,基于Winkler地基和Euler梁模型,建立了黏弹性地基中螺旋桩水平振动方程;其次,采用分离变量法严格推导出了螺旋桩的水平动力响应位移、弯矩和剪力解析解,并验证了解析解的合理性;最后,基于所得解析解,分析了时间和空间响应下各桩土参数对螺旋桩水平振动特性的影响。研究结果表明:螺旋桩桩顶位置水平位移会随着桩螺旋倾角减小而减小,螺旋倾角越小,螺旋桩桩顶位置水平位移变化程度越大;螺旋桩水平动力响应随着量刚一频率增大而减小,且在桩顶位置显著减小;螺旋桩水平动力响应随着桩土刚度比增大而增大,其中桩土刚度比对水平位移和弯矩的影响显著;量刚一频率越小,螺旋桩水平动力响应达到最大值所需时间越长,并且变化程度越大。In order to perfect the horizontal vibration theory of screw pile,the screw pile was firstly equivalent to a traditional straight pile with a specific pile diameter by the method of equivalent stiffness.The horizontal vibration equation of screw pile in viscoelastic foundation was established based on Winkler foundation and Euler beam model.Secondly,the analytical solutions of dynamic response of screw pile's horizontal displacement,bending moment and shear force were strictly derived by separated variable method,and the rationality of the analytical solution was verified.Finally,based on the analytical solution,the influence of pile-soil parameters on the horizontal vibration characteristics of screw pile with time and space response was analyzed.The results show that the horizontal displacement of screw pile top decreases with the decrease of pile screw inclination angle.The smaller the inclination is,the faster the horizontal displacement of screw pile top decreases.The horizontal dynamic response of screw pile decreases with the increase of dimensionless frequency,and it decreases significantly at the top of the pile.The horizontal dynamic response of screw pile increases with the increase of pile-soil stiffness ratio,which has more significant impacts on the horizontal displacement and bending moment.The smaller the dimensionless frequency is,the more time it takes for the horizontal dynamic response of screw pile to reach the maximum value,and the greater the degree of change is.

关 键 词：螺旋桩 水平振动 等效刚度 黏弹性地基 Euler梁模型 

分 类 号：TU473.1[建筑科学—结构工程]