大跨连拱隧道复合式中墙承载模式研究  

Research on Bearing Modes of Compound Middle-wall of Multi-arch Tunnels with Large Spans

作　　者：杨果林[1] 胡敏 申宗球 杨杰 YANG Guolin;HU Min;SHEN Zongqiu;YANG Jie(School of Civil Engineering,Central South University,Changsha 410075;Civil Engineering Co.,Ltd.,China Construction Fifth Engineering Bureau,Changsha 410004)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中建五局土木工程有限公司,长沙410004

出　　处：《现代隧道技术》2020年第1期136-141,共6页Modern Tunnelling Technology

基　　金：国家自然科学基金项目(51478484,51778641);中建五局土木工程有限公司立项项目(02012016YN77,02012016YN89)

摘　　要：为研究连拱隧道复合式曲中墙在隧道动态开挖过程中的承载特性,文章依托岳宁大道何家大岭复合式中墙连拱隧道,通过埋设元器件对中墙主筋轴力及墙肩混凝土应变进行监控量测。基于监控量测数据,划分了中墙主筋轴力发展阶段,分析了中墙主筋轴力发展规律,归纳了3种典型的中墙承载模式及其演变过程,得到了不同承载模式下中墙可能发生的失稳类型。利用中墙承载模式及其演变过程对墙肩混凝土主应变时程曲线进行解释,验证了其合理性。In order to study the bearing characteristics of the compound curved middle-wall of the multi-arch tun⁃nel during dynamic tunnel excavation,based on the Hejiadaling tunnel on the Yuelushan-Ningxiang highway,the axial force of main reinforcement and strain of concrete at the shoulder of middle-wall are monitored by embedded components.According to the data from the site monitoring,the development process of axial force of main reinforce⁃ment is divided into several stages,the law of axial force development of main reinforcement is analyzed,3 typical bearing modes of middle-wall and the development process are summarized,and the instability types of middlewall under different bearing modes are concluded.The relationship between principal strain of concrete at shoulder of middle-wall and time is interpreted by the bearing modes of middle-wall and the development process,and the rationality is verified thereof.

关 键 词：连拱隧道 复合式中墙 现场监测 承载模式 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]