大断面黄土隧道下穿高速公路施工技术及其数值模拟

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• 英文论文题名：Construction Technology and Numerical Simulation of the Large-Section Loess Tunnel Under-crossing the Highway
• 论文作者：丁春林 ; 吴超 ; 窦世学 ; 张伍星
• 英文论文作者：DING Chunlin ; WU Chao ; DOU Shixue ; ZHANG Wuxing ; 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 ; 短台阶七步开挖法 ; 辅助工法 ; 数值模拟
• 英文论文关键词：Large-section loess tunnel ; Pass through highway ; Short-bench seven-step excavation method ; Assistant technology ; Numerical simulation
• 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：6
• 文件大小：1303k
• 原文格式：O
• 会议级别：全国

摘要

大西铁路忻州大断面黄土隧道下穿既有运营的大运高速公路,该隧道埋深浅、黄土岩性差,施工时易产生塌方、大变形等施工风险。基于上述特点,提出大断面黄土隧道下穿高速公路段采用短台阶七步开挖法施工,辅助采用大管棚+小导管超前支护,开挖掌子面打入玻璃纤维锚杆加固,并采用弹塑性有限单元法对隧道施工全过程进行了模拟分析。结果显示:隧道下穿高速公路段采用短台阶七步开挖法可有效地控制隧道变形,施工方案是合理可行的,数值模拟计算结果与现场测试结果基本吻合,可为类似隧道下穿工程提供参考。
The Xinzhou large-section loess tunnel of Daxi railway which passes through the existing Dayun highway,is shallow buried and is with loess whose lithology is poor,and the tunnel is prone to appear landslides,large deformation and other construction risks during construction.Based on the above characteristics,it was put forward that the short-bench seven-step excavation method can be applied to the large-section loess tunnel passing through the highway section.Besides,some assistant technologies were applied:large pipe shed and advanced small pipe,and some glass fiber reinforced anchors were driven into the tunnel face.Finally,the elastic-plastic finite element method was adopted to simulate the whole process of tunnel construction.The results show that:the deformation of tunnel could be effectively controlled by using short-bench seven-step excavation method in the under-crossing highway section,and the construction scheme is reasonable and feasible,besides,numerical simulation results are consistent with the field testing results,which could provide references for such projects.

引文

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