楔形桩的动力响应与试验研究  

Study on Dynamic Response of Tapered Pile and Model Test

作　　者：王奎华[1,2] 童魏烽 肖偲 吴斌杰[1,2] WANG Kuihua;TONG Weifeng;XIAO Si;WU Binjie(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Key Laboratory of Soft and Geoenvironmental Engineering of MOE,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《湖南大学学报（自然科学版）》2019年第5期94-102,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51779217)~~

摘　　要：假设桩体为弹性,桩周土体通过平面应变模型描述,利用Laplace变换和阻抗传递法求得桩顶动力响应.对数值结果进行参数分析,讨论了桩土特性对楔形桩动力响应的影响,并且通过模型试验验证了理论的正确性.结果表明:1)存在临界桩径比,使得楔形桩的桩底反射信号难以判读,临界桩径比随桩长增大而增大;2)楔角和桩长对楔形桩的动力响应有较大的影响,对于桩尖直径为0的小直径楔形桩,桩长对其动力响应影响不大;3)土体的剪切波速和纵向分层性对楔形桩的动力响应会产生较大影响;4)模型试验结果与理论解符合,反映规律一致.The pile was supposed to be elastic and the plane-strain model was adopted to simulate the surrounding soil. By the means of Laplace transform and impedance function transfer method, the dynamic response of tapered pile was obtained. Then, by parametric method, the influence of pile and soil characteristics on the dynamic response of tapered pile was discussed. Meanwhile, the correctness of the theory was verified by model test. The results show that: 1)There is a critical pile diameter ratio at which the reflected signal from pile bottom is difficult to find, and the ratio increases as the pile grows;2) Cone angle and pile length have a great influence on the dynamic response of tapered pile. However, in the case of small-diameter pile with a zero-diameter end, pile length doesn't have an obvious influence;3) Shear wave velocity of soil and vertical distribution of soil have a great influence on the dynamic response of tapered pile;4) Good agreement is shown between experimental and theoretical results.

关 键 词：平面应变模型 楔形桩 桩径比 时域分析 频域分析 模型试验 

分 类 号：TU473.1[建筑科学—结构工程]