摘要
研究目的:随着我国陆路交通的快速发展,山区运营隧道在滑坡作用下的病害问题日益突出,而导致隧道变形破坏的最根本原因是滑坡的作用导致隧道受力模式的改变。同时,坡体不同的变形阶段对隧道结构的受力变形模式影响较大,目前在这方面缺乏深入的研究。研究结论:(1)以隧道-滑坡平行体系为研究对象,基于推移式滑坡岩土体的变形特点揭示了隧道受力渐进破坏过程的本质是滑坡推力和岩土抗力变化的过程,初步探讨了不同演化阶段滑坡的运动特点和隧道的力学特征,以不同演化阶段的隧道受力模式为基础,建立了半无限长梁、半无限长梁-悬臂梁模型;(2)采用弹性地基梁和结构力学理论,对位于滑坡体内和滑坡体外的隧道结构变形进行耦合解析,建立不同阶段隧道受力变形模式的理论计算公式,提出相应控制截面的解析解表达式,能够实现滑坡不同演化阶段隧道受力变形的评价;(3)通过模型试验进行了对比分析验证,结果表明该理论能够对滑坡中隧道的受力变形的发展进行预测以及为滑坡地段隧道的设计、加固治理提供理论参考。
Research purposes:With the rapid development of land transportation in China,the problem of tunnel diseases caused by landslides has become increasingly prominent in mountainous areas.The most fundamental cause of tunnel deformation and destruction is the change of tunnel stress mode caused by landslides.At the same time,the different deformation stages of the slope have great influence on the mechanical deformation mode of the tunnel structure,and there is a lack of in-depth research in this area at present.Research conclusions:(1)Taking the tunnel-landslide parallel system as the research object,based on the deformation characteristics of the rock and soil mass of the sliding landslide,it is revealed that the essence of progressive failure process of tunnel is the process of landslide thrust and rock and soil resistance change.The movement characteristics of landslide in different evolution stages and the mechanical characteristics of tunnel are preliminarily discussed.Based on the stress mode of tunnel in different evolution stages,the models of semi-infinite long beam and semi-infinite long beam-cantilever beam are established.(2)Based on the theory of elastic foundation beam and structural mechanics,the deformation of tunnel structure in and out of the landslide is analyzed by coupling method.The theoretical calculation formulas of stress and deformation modes of tunnels in different stages are established,and the analytical expressions of corresponding control sections are put forward,which can realize the evaluation of stress and deformation of tunnels in different stages of landslide evolution.(3)A comparative analysis and verification are carried out through model tests.The results show that the theory can predict the development of the stress and deformation of the tunnel in landslide,and provide theoretical reference for the design and reinforcement of the tunnel in landslide area.
作者
赵金
文丽娜
吴红刚
ZHAO Jin;WEN Lina;WU Honggang(Sichuan Highway Planning,Survey,Design and Research Institute Ltd,Chengdu,Sichuan 610041,China;Northwest Research Institute Co.Ltd of C.R.E.C,Lanzhou,Gansu 730000,China)
出处
《铁道工程学报》
EI
CSCD
北大核心
2023年第1期53-61,共9页
Journal of Railway Engineering Society
基金
国家重点研发计划项目(2018YFC1504901)
四川省交通运输科技项目(2021-ZL-07)
关键词
隧道-滑坡平行体系
变形模式
演化过程
半无限长梁模型
半无限长梁-悬臂梁模型
tunnel-landslide parallel system
deformation model
evolution process
semi-infinite beam model
semi-infinite beam-cantilever beam model
