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主管单位 中华人民共和国
工业和信息化部
主办单位 哈尔滨工业大学 主编 冷劲松 国际刊号ISSN 0367-6234 国内刊号CN 23-1235/T

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引用本文:王奎华,童魏烽.基于非等截面桩体模型的楔形桩动力响应[J].哈尔滨工业大学学报,2019,51(8):104.DOI:10.11918/j.issn.0367-6234.201806076
WANG Kuihua,TONG Weifeng.Dynamic response of tapered pile based on non-equal-section pile model[J].Journal of Harbin Institute of Technology,2019,51(8):104.DOI:10.11918/j.issn.0367-6234.201806076
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基于非等截面桩体模型的楔形桩动力响应
王奎华1,2,童魏烽1,2
(1.浙江大学 滨海和城市岩土工程研究中心,杭州 310058; 2.软弱土与环境土工教育部重点实验室(浙江大学),杭州 310058)
摘要:
为完善楔形桩的动力响应及应用理论,假设桩为弹性,将桩身划分为非等截面桩段,桩径线性渐变,采用Winkler模型模拟桩周土,建立基桩振动方程,通过换元变换进行简化,依次求得桩顶纵向振动速度的频域响应和时域响应,并通过控制变量法就相关影响因素展开深入讨论,结果表明:当地基土剪切波速较小时,本文模型计算结果与已有简化模型结果相近,随着土体剪切波速提高时,两者出现显著差别;针对3个楔形桩的几何特征参数,计算表明,桩长L主要影响桩底反射信号强度,桩长越长,反射信号峰越低;桩身半长处桩径Rm和楔角α主要影响C区曲线的位置,Rm越大,α越小,C段会更下沉,同时也会小幅影响桩底反射信号强度;桩身纵波速(弹性模量)越大,桩底反射信号越强,频响曲线的震荡幅度越大.
关键词:  非等截面桩体模型  Winkler模型  楔形桩  时域响应  频域响应
DOI:10.11918/j.issn.0367-6234.201806076
分类号:TU473.1
文献标识码:A
基金项目:国家自然科学基金面上项目(51779217)
Dynamic response of tapered pile based on non-equal-section pile model
WANG Kuihua1,2,TONG Weifeng1,2
(1.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2.MOE Key Laboratory of Soft and Geoenvironmental Engineering (Zhejiang University), Hangzhou 310058, China)
Abstract:
To improve the dynamic response of tapered piles and its application theory, the Winkler model was adopted to simulate surrounding soil, and the frequency domain and time domain responses of longitudinal vibration velocity of the pile top were obtained with the pile vibration equation simplified by changing variable, in which the pile was assumed to be elastic with gradually varied diameter and its body was divided into non-equal-section parts. The variable control method was adopted to investigate the influence factors. Results showed that the calculation results of the proposed model were similar with those of the traditional simplified model when soil shear wave velocity was low. However, the difference between the proposed model and the traditional simplified model became more significant as the shear wave velocity increased. For three geometric feature parameters, calculations showed that pile length L mainly affected the signal intensity of pile bottom. The longer the pile length was, the lower the reflected signal peak was. The radius Rm and cone angle α mainly affected the position of curve in C area, and slightly affected the reflection signal of pile bottom. With the increase of the compressional velocity (elastic modulus), the reflection signal of pile bottom and the amplitude of frequency response curve became more significant.
Key words:  non-equal-section pile model  Winkler model  tapered pile  time domain response  frequency domain response

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