盐渍土地区CFG桩水泥土褥垫层性能的研究  

Numerical simulation study on the performance of cement-soil cushion of CFG pile composite foundation in saline area

作　　者：厉永旭 温新昌 杨宝平 赖天文[2] Li Yongxu;Wen Xinchang;Yang Baoping;Lai Tianwen(Gansu Jiaoda Engineering Testing Technology Co.,Ltd.,Lanzhou Gansu 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]甘肃交达工程检测科技有限公司,甘肃兰州730070 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《山西建筑》2024年第17期62-66,共5页Shanxi Architecture

基　　金：甘肃省自然科学基金(22JR5RA1076)。

摘　　要：利用MIDAS-GTS NX数值模拟软件,针对褥垫层厚度和弹性模量变化对桩的沉降和桩土应力比的影响等问题,通过数值模拟对CFG桩桩顶沉降、桩顶应力、桩土应力比等进行研究,并得出以下结论:随着弹性模量的增大,桩土应力比增加趋于平缓,桩顶沉降增加;随着水泥土褥垫层厚度的增大,桩顶应力变化趋势也随之增大,且趋势基本相似;褥垫层厚度小于600 mm,弹性模量小于100 MPa时,地基沉降与二者参数变化有着较大关联;盐渍地区600 mm的水泥土褥垫层理论上可以有400 mm碎石褥垫层的工作性能。In this paper,MIDAS-GTS NX numerical simulation software is used to study the influence of cushion thickness and elastic modulus on pile settlement and pile-soil stress ratio.Through numerical simulation,the settlement of CFG pile top,pile top stress and pile-soil stress ratio are studied,and the following conclusions are drawn:With the increase of elastic modulus,the increasing trend of pile-soil stress ratio tends to be gentle,and the settlement of pile top increases.With the increase of the thickness of cement soil cushion,the change trend of pile top stress also increases.When the thickness of the cushion is less than 600 mm and the elastic modulus is less than 100 MPa,the settlement of the foundation is greatly related to the change of the two parameters.The 600 mm cement-soil cushion can theoretically achieve the working performance of the 400 mm gravel cushion.

关 键 词：CFG桩 褥垫层 桩土应力比 沉降 

分 类 号：TU472[建筑科学—结构工程]