基于非等截面桩体模型的缺陷楔形桩动力响应研究  

Dynamic Response of Defective Tapered Pile Based on Non-Equal-Section Pile Model

作　　者：王奎华[1,2] 童魏烽 王磊 Wang Kuihua;Tong Weifeng;Wang Lei(Rearch Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Key Laboratory of Soft and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou 310058,China;Zhejiang Urban and Rural Planning Design Institute,Hangzhou 310007,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310058 [3]浙江省城乡规划设计研究院,杭州310007

出　　处：《天津大学学报（自然科学与工程技术版）》2018年第12期1238-1245,共8页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51779217)~~

摘　　要：假设桩体为弹性,截面半径线性渐变,采用Winkler模型模拟桩土相互作用,建立基桩振动方程,利用有限差分法求解,并得到基本收敛条件.所得结果与一定工况下的解析解结果验证一致.对缺陷楔形桩的动力响应分析显示:(1)缺陷长度对桩底反射影响较小,对缺陷反射影响较大,对频响曲线的共振频率和振幅影响也较大;(2)缺陷程度对桩底反射、缺陷反射、频响曲线的影响均较大;(3)对于缺陷楔形桩,存在临界桩径比和临界截面缺陷比,这会使得无法接收到桩底反射,且桩长越长,临界桩径比和临界截面缺陷比越大.The pile was supposed to be elastic.Section radius changes linearly.Winkler model was adopted to simulate surrounding soil.By the finite difference method(FDM),the pile vibration equation was solved.The basic convergence condition was also obtained.And the result of FDM was proved to be consistent with the analytical solution under certain conditions.Dynamic response analysis of defective tapered pile shows:①Length of defects has little effect on the bottom reflection signal,though it has a great effect on the defect reflection signal as well as resonant frequency and amplitude of frequency domain response curves;②Impacts of degree of defects on the bottom reflection,the defect reflection and frequency domain response curve are all great;③For defective tapered pile,there is a critical pile diameter ratio and critical section deflect ratio at which the reflected signal from pile bottom is difficult to find,and the ratios increase as the pile grows.

关 键 词：非等截面桩 WINKLER模型 缺陷楔形桩 临界尺寸 时域响应 频域响应 

分 类 号：TU473.1[建筑科学—结构工程]