论文部分内容阅读
采用Voigt体来模拟桩身变截面与土的相互作用,得到了三维波动土中考虑变截面与土相互作用的大直径桩–土作用模型。对桩身变截面处的应力平衡和应变连续条件进行拉普拉斯变换,得到修正的阻抗函数递推法。桩周土采用考虑径向和纵向波动的三维轴对称模型,桩身采用黏弹性Rayleigh-Love杆来考虑大直径桩的横向惯性效应。结合修正的阻抗函数递推法,通过求解桩土动力平衡方程得到了桩顶的速度频响的解析解和瞬态激振下速度时域响应的半解析解。通过参数分析,将所得解与忽略桩身变截面与土相互作用的解进行对比,并分析有关参数与变截面与土相互作用的耦合作用。
The Voigt body is used to simulate the interaction between the pile body and the soil, and a large-diameter pile-soil interaction model considering the interaction between soil profile and soil is obtained. Laplace transform was applied to the stress balance and strain continuity conditions at the variable cross section of the pile, and a modified recursive impedance function was obtained. The three-dimensional axisymmetric model taking account of radial and longitudinal fluctuations is used for the soil around the pile, and the viscoelastic Rayleigh-Love rod is adopted to consider the lateral inertial effect of the large diameter pile. Combined with the modified recursion of impedance function, the analytic solution of velocity-frequency response of pile top and the semi-analytical solution of velocity-time response under transient excitation are obtained by solving the dynamic equation of pile-soil dynamic equilibrium. Through parametric analysis, the solution is compared with the neglected solution of the pile-body interaction and soil interaction, and the coupling between the parameters and the soil-soil interaction is analyzed.