基坑被动区加固对邻近既有铁路工程变形影响研究  

Research on Influence of Passive Zone Reinforcement of Foundation Pit on Deformation of Adjacent Buildings

作　　者：孙峰[1] 段雨彤 张迪[1] 童明 SUN Feng;DUAN Yutong;ZHANG Di;TONG Ming(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China;School of Civil Engineering,Sun Yat-sen University,Zhuhai Guangdong 519082,China;Southern Engineering Inspection and Repair Technology Research Institute,Huizhou Guangdong 516000,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]中山大学土木工程学院,广东珠海519082 [3]南方工程检测修复技术研究院,广东惠州516000

出　　处：《铁道建筑》2024年第6期160-166,共7页Railway Engineering

摘　　要：针对邻近既有铁路工程进行基坑开挖时二者相互影响的问题,以秦望隧道明挖段基坑为例,建立三维有限元模型,分析被动区抽条和裙边加固相结合的方式下基坑开挖对围护结构、地表及邻近铁路工程变形的影响规律,研究了加固参数对邻近铁路工程建筑物变形的影响,分析变形原因并采用主成分分析法提出具体工程的最优加固参数。结果表明:被动区在多种加固方式下,天然地表沉降曲线发生变化;铁路路基基础设施变形,受到多种因素的共同作用,增加抽条加固宽度有利于减小侧移,增加裙边加固宽度有利于减小沉降。In response to the issue of mutual influence between adjacent existing railway projects during excavation of foundation pits,a three-dimensional finite element model was established using the open excavation section of the Qin-Wang Tunnel as an example.The influence of excavation on the surrounding structure,ground surface,and deformation of adjacent railway projects was analyzed by combining passive zone strip drawing and border reinforcement.The influence of reinforcement parameters on the deformation of adjacent railway engineering buildings was studied,and the causes of deformation were analyzed,then the optimal reinforcement parameters for specific projects were proposed by using principal component analysis.The results indicate that the passive zone undergoes changes in the natural ground surface settlement curve under various reinforcement methods.For the deformation of railway subgrade infrastructure,it is influenced by multiple factors.Increasing the width of reinforcement strips is beneficial for reducing lateral displacement,while increasing the width of border reinforcement is beneficial for reducing settlement.

关 键 词：深基坑 被动区加固 数值模拟 邻近既有铁路 主成分分析 

分 类 号：U213.4[交通运输工程—道路与铁道工程]