隧道施工对上方既有输气管道结构安全的影响分析  

Analysis of influence of tunnel construction on structure safety of existing gas pipeline

作　　者：张龙[1] 覃羽诗 韩文杰 田祖安[1] 陈金良 ZHANG Long;QINYusht;HANWenjie;TIAN Zuyan;CHEN J inliang(Department of Theoretical and Applied Mechanics, Chongqing University of Science and Technology,Chongqing 401331,China;CCCC Tunnel Fourth Engineering Company Limit-ed, Chengdu,Sichuan 610091,China)

机构地区：[1]重庆科技学院数理学院力学系,重庆401331 [2]中交隧道局第四工程有限公司,四川成都610091

出　　处：《江苏建筑职业技术学院学报》2018年第1期12-15,共4页Journal Of Jiangsu Vocational Institute of Architectural Technology

基　　金：重庆市基础与前沿研究计划项目(cstc2016jcyjA0259);重庆市教委科学技术研究项目(KJ1601304)

摘　　要：采用ABAQUS软件建立拟建隧道和上方既有输气管道的三维有限元模型,利用"生死"单元对拟建隧道分步开挖和支护进行模拟.分析开挖过程中土体的沉降和塑性应变、混凝土支护结构的应力,重点研究既有输气管道的沉降量及应力分布.数值计算表明:开挖结束后混凝土支护的最大拉应力、管道的最大沉降值以及管道最大应力均未超过许用值,拟建隧道开挖后上方输气管道是安全的.In this paper,a 3 Dmodel of the proposed tunnel and the existing gas pipeline is established by ABAQUS software,and the ＂model change＂ units are used to simulate the step excavation and supporting.The settlement and plasticity of soil,stress of concrete supporting structure in excavation process are analyzed,and the settlement and stress distribution of existing gas pipeline are mainly studied.Numerical calculation shows that the maximum tensile stress,the maximum settlement value and the maximum stress of the pipe are not exceed the allowable value.Overall,the gas pipeline above is safe after the excavation of the tunnel.

关 键 词：隧道施工 输气管道 结构安全 数值模拟 

分 类 号：TU445[建筑科学—岩土工程]