山岭隧道洞口段地震响应特性研究

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• 英文论文题名：Research on Seismic Numerical Simulation of Tunnel Portal
• 论文作者：周慧超 ; 许炜萍 ; 王海粟 ; 孙克国
• 英文论文作者：ZHOU Huichao ; XU Weiping ; WANG Haisu ; SUN Keguo ; Key Laboratory of Transportation Tunnel Engineering ; Ministry of Education ; Southwest Jiaotong University
• 年：2016
• 作者机构：西南交通大学交通隧道工程教育部重点实验室;
• 论文关键词：隧道 ; 洞口段 ; 抗震 ; 数值模拟
• 英文论文关键词：Tunnel ; Portal section ; Seismic ; 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：U452.28
• 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：1304k
• 原文格式：O
• 会议级别：全国

摘要

采用ABAQUS有限元软件,通过数值模拟研究手段,研究洞口段隧道地震响应机理和仰坡坡度、围岩级别对衬砌的影响,通过与室内模型试验数据相比较,总结衬砌的地震响应规律,确定洞口段设防长度。结果表明:衬砌动力响应在洞口附近有放大效应,进入洞内50 m后衬砌响应趋于稳定。衬砌拱部受拉压往复荷载作用,拱腰、拱脚为薄弱环节。仰坡坡度的增大,没有改变衬砌的响应模式,但放大效应有所减缓。应力受围岩级别影响显著,随着围岩质量增加应力明显减小。隧道洞口段应设置减震层,加固围岩,确定洞口抗震设防长度为50 m。
The influence of the slope gradient and surrounding rock grade on seismic response was studied by using finite element code ABAQUS.The laws of earthquake response of lining were summarized and anti-seismic fortified length were determined.The result showed that the dynamic response of the lining has amplification effect in the entrance of the tunnel.Acceleration of lining tend to be stable in the tunnel about 50 m.The lining is affected by tension and compression,and the arch and arch foot are weak.The slope of the slope increases,the response pattern of the lining has not changed,the amplification effect has been slowed down.Stress affected by the surrounding rock level significantly,with the increase of the level of stress increased significantly.The shock absorbing layer should be set at the entrance of the tunnel,and reinforce the surrounding rock.Anti-seismic fortified length of tunnel is determined to be 50 meters.

引文

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