黄土高填方挖填结合区桩基础数值模拟研究

Numerical Simulation of Pile Foundation in Loess High Fill Excavation and Fill Combined Area

为了分析黄土地区桩基础的力学响应特性,文中建立了桩基础的仿真模型,模拟分析了不同材料参数条件下桩基础的变形及受力特性。结果表明,桩基础的侧阻力随着深度的增加呈现先稳定后增加(正摩阻力)、再反向增加(负摩阻力)的变化规律,增加筏板和抬升坡度均可有效增加桩侧的摩阻力;桩基础的桩身轴力随着深度的增加呈现先增加(桩体埋深小于20 m)后降低(桩体埋深20~30 m)的变化规律,增加筏板、抬升坡度及增加桩径均可有效降低桩身的轴力,抬升坡度可有效降低桩身侧向的土压力。

In order to analyze the mechanical response characteristics of pile foundation in loess area,the paper established a simulation of pile foundation,simulated and analyzed the deformation and stress characteristics of pile foundation under different material parameters.The results show that with the increase of depth,the lateral resistance of pile foundation is stable at first,then increases(positive friction resistance)and then increases in reverse(negative friction resistance).Increasing raft and raising slope can effectively increase the lateral friction resistance of pile foundation.With the increase of depth,the axial force of pile foundation first increases(the buried depth of pile is less than 20 m)and then decreases(the buried depth of pile is 20~30 m).Increasing raft,raising slope and increasing pile diameter can effectively reduce the axial force of pile,and raising slope can effectively reduce the lateral soil pressure of pile.