运营公路隧道病害对衬砌结构安全性的影响  

Safety influence of operating highway tunnel caused by sturcture disease

作　　者：李彬[1] 雷明锋[2] 李文华[2] 

机构地区：[1]长沙理工大学校办产业处,湖南长沙410076 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2011年第5期40-45,共6页Journal of Railway Science and Engineering

基　　金：国家重点基础研究发展计划资助项目(973:2011CB013802);铁道部科技研究开发计划重大课题(2009G005-E2008G025-C);湖南省研究生创新基金项目(CX2010B094)

摘　　要：针对常见的隧道混凝土材料劣化、衬砌厚度不足及背后脱空3类病害,基于荷载-结构平面分析模型,通过设置不同病害程度等级,分析运营公路隧道病害对衬砌结构的安全性影响规律。研究结果认为:(1)衬砌结构截面最小安全系数随混凝土材料劣化呈同比例线性下降,以发生劣化的局部位置最为显著;(2)衬砌结构厚度不足直接降低了结构截面刚度,欠厚部位安全性能随之下降;(3)衬砌背后脱空改变了结构受力和变形模式,对结构的安全性能影响最大,特别是当脱空范围大于2 m时,在围岩荷载作用下,衬砌结构将很快出现开裂、剥落等严重结构型病害,直至完全丧失承载能力或退出正常使用状态。Safety influence of operating road tunnel caused by 3 types of structure diseases,such as material degradation of tunnel concrete,insufficient thickness of lining and cavity behind lining,was studied systematically based on structure-load plane analysis model.The results show：（1） the minimum safety factor of lining structure section declines linearly with concrete degrading,especially the degrading local position;（2） structure stiffness decreases directly because of insufficient thickness of lining,and the safety performance of insufficient position declines too;（3） mode of stress and strain is changed because of the existence of cavity behind lining which is the maximum influence factor,especially,if the cavity scope exceeds 2 m.Acted by surrounding rock load,serious structure disease will appear on the lining structure including cracking and spalling till to lose its bearing capacity completely or out of normal service condition

关 键 词：公路隧道 结构病害 材料劣化 厚度不足 背后脱空 安全性影响 

分 类 号：U457.2[建筑科学—桥梁与隧道工程]