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。
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. © 2016, Science Press. All right reserved.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2016年第S2期223-231,242,共10页
Rock and Soil Mechanics
基金
国家自然科学基金面上项目(No.51378464
No.51579217)~~
