季节性冻土CFG桩复合地基冻融循环后承载力数值模拟

运用ABAQUS软件研究了寒区季节性冻土区,具有不同初始弹性模量桩体和不同褥垫层厚度的CFG桩复合地基在经历冻融循环后的荷载分担比、桩-土应力比及荷载-桩沉降曲线的规律。结果表明,冻融循环会降低桩体分担荷载,降低桩-土应力比并加剧地基沉降。具有相同褥垫层材料的CFG桩,褥垫层越厚,相同冻融循环后的桩-土应力比相差越小。文中结果可为寒区CFG桩复合地基设计提供参考。

SIMULATION FOR BEARING CAPACITY OF CFG PILE AFTER THE FREEZE-THAW CYCLE

Abaqus was used to simulate bearing capacity of CFG pile located in seasonally frozen ground after the freeze-thaw cycle.CFG piles with different initial elasticity modulus and thickness of cushion were consider in this paper.Load sharing ratio,pile-soil stress ratio and settlement curve were selected for evaluating.The results indicate that the road of the pile reduced dur to freeze-thaw cycle,but foundation settlement increased at the same time.A thicker cushion can reduce the difference of the between pile-soil stress ratio.The results can provide reference for practical engineering.