浅埋偏压连拱隧道施工开挖顺序研究  

Study on Excavation Sequence of Shallow-Buried Multi-Arch Tunnel Construction Under Unsymmetrical Pressure

作　　者：田敬军 TIAN Jingjun(China Railway 14th Bureau Group Co.Ltd.,Jinan Shandong 250000,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250000

出　　处：《铁道建筑技术》2022年第6期191-195,共5页Railway Construction Technology

基　　金：国家重点研发项目(2021YFC3002004)。

摘　　要：为研究先行洞优先原则以及中导洞三台阶法开挖顺序对浅埋偏压连拱隧道的影响,以小尖山连拱隧道工程为依托,基于有限元差分软件和实际监测数据分析,探讨两种不同开挖方案下隧道围岩变形、初支应力和中隔墙应力变化规律,根据分析结果针对性提出“先浅后深”开挖方案;结合小尖山隧道二衬变形及中隔墙顶部应力监测数据,验证中导洞三台阶法“先浅后深”方案可行性,以确定浅埋偏压连拱隧道施工的安全性。In order to study the priority principle of the first-excavation hole and the influence of the shallow-buried unsymmetrical loading multi-arch tunnel by the middle heading three-bench excavation method,this paper is based on the Xiaojianshan multi-arch tunnel project and with the help of the finite element difference software and the analysis of actual monitoring data to discuss the variation laws of tunnel surrounding rock deformation,initial support stress and center pillar stress under two different excavation schemes,and the excavation plan of “shallow first and then deep” is put forward according to the analysis results.Combined with the monitoring data of the secondary lining deformation and the top stress of the middle wall of Xiaojianshan Tunnel,the feasibility of “shallow first and then deep” scheme of the middle heading three-bench excavation method is verified,so as to determine the construction safety of shallow-buried multi-arch tunnel under unsymmetrical pressure.

关 键 词：浅埋偏压 连拱隧道 施工工序 开挖顺序 数值模拟 监测 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]