摘要
我国地域辽阔,湿陷性黄土区分布范围较广,由于其本身的复杂性和特殊性,湿陷性黄土区复合地基极易发生压缩沉降变形,不仅增加了施工难度和成本,且工后质量不易保证,甚至造成人身安全和财产损失。本文借助大型有限元软件ABAQUS对长短桩复合地基进行三维数值模拟研究,重点探讨分析长短桩弹性模量大小对复合地基沉降特性的影响,旨在为今后高速铁路复合地基的设计和施工提供一定的参考依据,提高工程质量和减少成本损失。结果表明,长短桩模量的增加对减小沉降并不明显;CFG长桩对复合地基沉降控制有较大作用,通过增加短桩模量来控制地基沉降的做法并不科学。
China has a vast territory and a wide range of collapsible loess areas.Due to the complexity and particularity of collapsible loess,composite foundations in collapsible loess areas are prone to compression and settlement deformation.It not only increases the difficulty and cost of construction,but also makes it difficult to guarantee the quality after construction,and even easily causes huge personal safety and property damage.This paper uses the large-scale finite element software ABAQUS to carry out three-dimensional numerical simulation research on long and short pile composite foundation,and specifically studies the influence of the elastic modulus of long and short piles on the settlement characteristics of composite foundations,with the purpose of providing some certain reference for the design and construction of high-speed railway composite foundation in the future,as well as improving the quality of the project and reducing the cost loss.The results show that the increasement of the modulus about the long pile is not obvious to reduce the settlement;CFG long pile has a greater effect on the settlement control of composite foundation,and it is not scientific to control the foundation settlement by increasing the modulus of the short pile.
作者
翟玉雄
ZHAI Yuxiong(China Railway 21st Bureau Group Sixth Engineering Co.Ltd.,Beijing 100000,China)
出处
《铁道建筑技术》
2020年第10期19-23,共5页
Railway Construction Technology
基金
中国铁建股份有限公司(17-C21)。
关键词
长短桩
复合地基
弹性模量
沉降特性
数值分析
long and short pile
composite foundation
elastic modulus
settlement characteristic
numerical analysis
