软岩浅埋超大断面隧道施工方案比选研究  

A comparative study on construction schemes for shallow-buried large cross-section tunnels in soft rock

作　　者：张云龙 陈榆木 王志伟 王辉 惠宝[1] 刘昕华 胥锋涛 徐强 Zhang Yunlong;Chen Yumu;Wang Zhiwei;Wang Hui;Hui Bao;Liu Xinhua;Xu Fengtao;Xu Qiang(China Railway First Bureau Group Fourth Engineering Co.,Ltd.,Xianyang Shaanxi 712000,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;China Railway First Bureau Group Co.,Ltd.,Xi’an Shaanxi 710054,China;China Railway Chengdu Bureau Group Co.,Ltd.,Chengdu Sichuan 610081,China)

机构地区：[1]中铁一局集团第四工程有限公司,陕西咸阳712000 [2]重庆大学土木工程学院,重庆400045 [3]中铁一局集团有限公司,陕西西安710054 [4]中国铁路成都局集团公司,四川成都610081

出　　处：《山西建筑》2025年第8期123-126,共4页Shanxi Architecture

基　　金：国家自然科学基金面上项目(项目编号:41972266)。

摘　　要：超大断面隧道由于其开挖跨度较大,施工过程烦琐复杂,导致围岩受到多次扰动。当隧道穿越软岩地层且埋深较浅时,隧道开挖过程的安全性会受到严重影响,因此选择合理的施工方案对隧道施工安全显得尤为关键。依托某浅埋软岩超大断面隧道,采用FLAC3D有限差分软件对CRD法和双侧壁导坑法两种施工方案进行模拟,分析了两种施工方案下隧道地表沉降、隧道围岩位移、围岩应力和支护结构应力变化特点,结果表明:双侧壁导坑法较CRD法能够有效降低拱顶沉降值和底鼓变形,其地表沉降值和围岩垂直应力更低。通过数值模拟计算为具有类似地形地质的隧道施工方案提供参考。Due to its large excavation span and complicated construction process,the surrounding rock of super-large section tunnel is disturbed many times.When the tunnel passes through the soft rock stratum and the buried depth is shallow,the safety of the tunnel excavation process will be seriously affected.Therefore,it is particularly critical to select a reasonable construction plan for the safety of tunnel construction.Based on a shallow buried soft rock super large section tunnel,this paper uses FLAC3D finite difference software to simulate the two construction schemes of CRD method and double side heading method,and analyzes the surface settlement,surrounding rock displacement,surrounding rock stress and supporting structure stress of the tunnel under the two construction schemes.The results show that the double side heading method can effectively reduce the vault settlement value and floor heave deformation compared with the CRD method,and the surface settlement value and the vertical stress of the surrounding rock are lower.Through numerical simulation calculation,it provides a reference for tunnel construction schemes with similar topography and geology.

关 键 词：超大断面隧道 软岩 CRD法 双侧壁导坑法 数值模拟计算 

分 类 号：TU997[建筑科学—市政工程] U455[建筑科学—桥梁与隧道工程]