论文部分内容阅读
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。
The pile-soil system is divided into a sufficient number of micro-element sections. The interaction between the annular convex surface at the contact surface of the adjacent micro-element pile section and the soil is simulated by a single Voigt body to obtain the spring and viscosity-pot coefficient of the Voigt body. Combined with the stress equilibrium condition and the displacement continuous condition on the contact surface of the adjacent micro-element pile section, the modified impedance function recursion method is obtained, and the pile body adopts the Rayleigh rod to consider the lateral inertial effect of the pile body. Combined with the boundary conditions of pile bottom, the analytic solution of the top complex impedance of the large-diameter wedge-shaped piles considering the vertical action of the soil around the pile under the plane strain condition was obtained by Laplace transform and modified impedance function recursion method . By comparing with the existing solutions, the effect of the vertical soil around the pile on the complex stiffness of the pile top and the top of the pile under transient excitation was studied. The vertical interaction between the soil around the pile and Coupling effect of pile - soil system parameters on pile complex stiffness.