大断面黄土隧道下穿高速公路开挖施工参数分析

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• 英文论文题名：Analysis of Excavation Parameters for the Large-Section Loess Tunnel Under-crossing the Highway
• 论文作者：丁春林 ; 吴超 ; 张伍星 ; 赵灵吟
• 英文论文作者：DING Chunlin ; WU Chao ; ZHANG Wuxing ; ZHAO Lingyin ; Education Ministry Key Lab of Road and Traffic Engineering ; Tongji University ; The Fifth Engineering CO. ; Ltd of China Railway Twenty-Five Bureau Group
• 年：2016
• 作者机构：同济大学道路与交通工程教育部重点实验室;中铁二十五局集团第五工程有限公司;
• 论文关键词：大断面黄土隧道 ; 下穿高速公路 ; 双侧壁导坑法 ; 开挖参数 ; 有限元分析
• 英文论文关键词：Large section loess tunnel ; Under-crossing highway ; Double-side-drift method ; Excavation parameter ; Finite element analysis
• 会议召开时间：2016-10-24
• 会议录名称：2016中国隧道与地下工程大会（CTUC）暨中国土木工程学会隧道及地下工程分会第十九届年会论文集
• 语种：中文
• 分类号：U455.4
• 学会代码：OGTY
• 会议名称：2016中国隧道与地下工程大会（CTUC）暨中国土木工程学会隧道及地下工程分会第十九届年会
• 会议地点：中国四川成都
• 主办单位：中国土木工程学会隧道及地下工程分会
• 学会名称：中国土木工程学会
• 页数：7
• 文件大小：2229k
• 原文格式：O
• 会议级别：全国

摘要

大西客运专线某黄土隧道开挖断面大,围岩稳定性差,下穿高速公路时存在一定施工风险。基于有限元Plaxis-3D分析软件,采用摩尔-库伦破坏模型,对隧道开挖采用双侧壁导坑法进行了数值模拟,研究分析了不同开挖循环进尺、开挖顺序、开挖分块大小等参数对隧道变形和受力的影响。研究结果显示:大断面黄土隧道下穿高速公路时采用双侧壁导坑法施工,开挖循环进尺宜控制在1.0 m;选择先开挖左导坑、后开挖右导坑施工工序;下导坑高度采用3.0 m左右。这些开挖参数为隧道采用双侧壁导坑法施工提供了依据。
One loess tunnel in Daxi railway is of large section,and the stability of the surrounding rock is poor,construction risks exist when it passes through highway.Based on Plaxis-3D finite element software,Mohr-Coulomb model was adopted to do numerical simulation for tunnel excavation using double-side-drift method.Different cycle footages,excavation sequences and altitude differences were analyzed to study their influence on tunnel deformation and stress.The result shows that:when adopting double-side-drift method in large section loess tunnel passing through highway,the single-cycle footage should be about 1 meters;left heading should be firstly excavated and right heading should be secondly excavated;besides,the under heading should be about 3 meters.These construction parameters provide references for the tunneling adopting double-side-drift method.

引文

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