饱和黄土地区CFG桩复合地基承载特性有限元分析

Finite Element Analysis on Bearing Characteristics of CFG Pile Composite Foundation in Saturated Loess Region

以西部管道工程兰州原油末站为工程背景,运用ANSYS有限元软件分别研究了不同荷载、褥垫层厚度、桩体模量及桩径对饱和黄土地区中CFG桩复合地基沉降的影响。结果表明:沉降随着荷载的增加而增大,桩间土荷载分担比随着荷载的增加逐渐减小,而桩荷载分担比逐渐增大;承台的沉降随褥垫层厚度增加略有增加,桩顶沉降却略有减小,且当褥垫层厚度相同时,桩土应力比随着荷载的增加而增大,在相同荷载下,桩土应力比随着褥垫层厚度的增加而减小,沉降与桩体模量的变化关系类似于玻尔兹曼函数;沉降随桩径的增大而减小。

Based on the Lanzhou crude oil terminal station of western pipeline project, in this paper, the effects of load, cushion thickness, pile modulus and pile diameter on the settlement of CFG pile composite foundation in saturated loess area. are studied by using ANSYS finite element software. The results show that the settlement increases with the increase of load, the load-sharing ratio between pile space soil decreases with the increase of load and the load-sharing ratio of pile increases. The settlement of the cap increases slightly with the increase of the cushion thickness, but the settlement of the pile top decreases slightly. When the cushion thickness is the same, the pile-soil stress ratio increases with the increase of the load and the pile-soil stress ratio decreases with the increase of cushion thickness under the same load. The relationship between the settlement and the modulus of the pile is similar to the Boltzmann function and the settlement decreases with the increase of the diameter of the pile.