| 考虑桩周土竖向作用大直径楔形桩纵向振动特性 |
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| 引用本文： | 王奎华,高 柳,肖 偲,王 宁.考虑桩周土竖向作用大直径楔形桩纵向振动特性[J].岩土力学,2016,37(Z2):223-231. |
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| 作者姓名： | 王奎华 高 柳 肖 偲 王 宁 |
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| 作者单位： | 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；
3. 华东交通大学 土木建筑学院，江西 南昌 330000 |
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| 基金项目： | 国家自然科学基金面上项目（No. 51378464，No. 51579217）。 |
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| 摘 要： | 将桩土系统划分为数量足够多的微元段，相邻微元桩段接触面处的环形凸面与土的相互作用采用单个Voigt体模拟，求得Voigt体的弹簧和黏壶系数。结合相邻微元桩段接触面上的应力平衡条件和位移连续条件，得到修正的阻抗函数递推法，桩身采用Rayleigh杆考虑桩身的横向惯性效应。结合桩底的边界条件，运用拉普拉斯变换和修正的阻抗函数递推法求得了平面应变条件下成层土中考虑桩周土竖向作用时大直径楔形桩桩顶复阻抗的解析解。通过与已有解对比，研究了桩周土竖向作用对桩顶复刚度和桩顶在瞬态激振下的速度响应的影响，并在低频域内详细分析了桩周土的竖向作用与桩土系统参数对桩顶复刚度的影响的耦合作用。
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| 关 键 词： | 楔形桩 桩周土竖向作用 阻抗函数 修正的阻抗函数递推法 |
| 收稿时间： | 2016-06-28 |
Dynamic characteristic of large diameter tapered pile considering vertical reaction of pile surrounding soil |
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| WANG Kui-hua,GAO Liu,XIAO Si,WANG Ning.Dynamic characteristic of large diameter tapered pile considering vertical reaction of pile surrounding soil[J].Rock and Soil Mechanics,2016,37(Z2):223-231. |
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| Authors: | WANG Kui-hua GAO Liu XIAO Si WANG Ning |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China;
2. Key Laboratory of soft soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310058, China;
3.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi 330000, China |
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| Abstract: | By discretizing the pile-soil system into finite segments, the interaction of the annular projections at the interface of adjacent pile segments can be simplified as a Voigt model. The spring constant and damper coefficient of the Voigt model is then derived. Combining the displacement and stress continuity conditions at the interface of adjacent pile segments, a new relationship between impedance functions of adjacent pile segments is derived, which is called amended impedance function transfer method. Taking the transverse inertia effect into account, the pile segment is assumed to be a Rayleigh-Love rod. Taking Laplace transform on the governing equation of pile segment and combining the boundary condition at pile toe, the impedance function at pile top could be derived through the amended impedance function transfer method. A comparison study between the solution proposed in this paper and existing analytical solutions is conducted to give insight to the effects of vertical reaction of the surrounding soil on the complex impedance at pile top and velocity response at pile top subjected to transient excitation. Then a parameters study is conducted to give insight to the coupled effects between the vertical reaction of the surrounding soil and the parameters of pile-soil system on the complex impedance at pile top. |
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| Keywords: | tapered pile vertical reaction of pile surrounding soil impedance function amended impedance function transfer method |
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