摘要
随着我国交通强国建设向西部丘陵重山地区推进,地震作用下山岭隧道衬砌与地层的相互作用机制愈发受到关注。以常规二车道公路隧道(V级围岩段)为原型,开展山岭隧道静力推覆模型试验,重点分析地层位移、地层应变、围岩压力随推覆距离的变化规律,探讨了衬砌-地层相互作用机制。试验结果表明:衬砌-地层相互作用可分为挤密、倾覆、裹挟3个阶段。倾覆阶段地层以起拱线为支点环向绕流,裹挟阶段地层带动衬砌发生整体位移。起拱附近线地层以径向挤压为主,形成挤压变形区,拱肩附近地层则以环向挤压为主,形成滑移变形区。左右两侧围岩压力的响应规律恰好相反,即右侧挤压区的围岩压力较左侧大,而右侧滑移区的围岩压力较左侧小。研究成果可为基于反应位移法的山岭隧道抗震计算提供试验依据与技术支撑。
With the rapid development of traffic infrastructure construction in western mountain area,the lining-stratum interaction mechanism of mountain tunnel under seismic effects has attracted increasing attentions.Based on the prototype of a regular two-lane highway tunnel section with V-grade surrounding rock,a static pushover model test for mountain tunnel was conducted.The variations of stratum displacement,stratum strain and ground pressure with pushover distance were carefully studied,and the lining-stratum interaction mechanism was thoroughly discussed.The test results show that:the lining-stratum interaction can be generally divided into compacting stage,overturning stage,and dragging stage.The stratum tends to circumferentially flow along the lining perimeter from the springing line in the overturning stage,and then drives the lining to shift together in the dragging stage.The stratum near the springing line experiences predominantly radial compression,forming a compression deformation zone,while the stratum near the lining shoulder mainly undergoes circumferential compression,forming a slip deformation zone.The response of the ground pressure on the left and right sides are exactly opposite.Specifically,the ground pressure in the compression deformation zone on the right side is greater than its counterpart on the left side,while the ground pressure in the slip deformation zone on the right side is less than its counterpart on the left side.These researches can provide some experimental basis and technical support for the anti-seismic calculation of mountain tunnels based on response displacement method.
作者
卢钦武
关振长
林林
吴淑婧
宋德杰
LU Qin-wu;GUAN Zhen-chang;LIN Lin;WU Shu-jing;SONG De-jie(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350116,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第8期2318-2326,共9页
Rock and Soil Mechanics
基金
国家自然科学基金(No.52278399)
福建省自然科学基金(No.2021J01599)。
作者简介
第一作者:卢钦武,男,1995年生,博士研究生,主要从事隧道工程方面研究工作。E-mail:lqw5467@163.com;通讯作者:关振长,男,1980年生,博士,教授,博士生导师,主要从事岩土与隧道工程方面的科研和教学工作。E-mail:gaussto@hotmail.com。
