隧道-洞口滑坡平行体系受力变形模式与计算方法研究  

Study on Modes and Calculation Method of Stress and Deformation of TunnelPortal Landslide Parallel System

作　　者：赵金 文丽娜 吴红刚 周驰词 ZHAO Jin;WEN Lina;WU Honggang;ZHOU Chici(Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041;China Railway Northwest Research Institute Co.,Ltd.,Lanzhou 730070;China Railway Landslide Engineering Laboratory,Lanzhou 730070;Provincial Laboratory of Western Environmental Geotechnical Soil and Site Remediation Technology,Lanzhou 730070)

机构地区：[1]四川省公路规划勘察设计研究院有限公司,成都610041 [2]中铁西北科学研究院有限公司,兰州730070 [3]中国中铁滑坡工程实验室,兰州730070 [4]西部环境岩土与场地修复技术工程实验室,兰州730070

出　　处：《现代隧道技术》2022年第2期53-61,共9页Modern Tunnelling Technology

基　　金：国家重点研发计划项目(2018YFC1504901);四川省科技厅重点研发计划项目(2020YFS0361);四川省交通运输科技项目(2021-ZL-07).

摘　　要：我国目前对隧道-滑坡工程的设计尚无可供参照的行业标准,尤其是滑坡洞口段隧道缺少相应的计算理论。文章首先以平行体系中隧道-洞口滑坡为研究对象,通过归纳总结滑坡地段隧道衬砌的病害特征,构建了相应的工程地质模型;然后将剩余滑坡推力视为导致隧道变形破坏的直接原因,通过荷载传递规律得到作用于隧道结构上的附加荷载,将其与围岩压力叠加推导出了隧道外荷载的计算公式;接着采用弹性地基梁理论,推导出滑坡推力作用下的隧道内力计算方法,从而得到隧道-洞口滑坡的受力变形模式及计算理论;最后通过模型试验对其合理性进行了验证分析,结果表明该方法与实际工程相符,能够为滑坡地段洞口隧道的设计提供参考。At present,the unified industry standard has not yet been issued in China for the design of tunnel-land⁃slide engineering.Particularly,there is a lack of corresponding calculation theories for tunnels at the portal-land⁃slide section.Taking the tunnel-portal landslide in the parallel system as the research subject,this paper constructs the corresponding engineering geological model by summarizing the failure characteristics of the tunnel lining in the landslide sections.Considering the residual landslide thrust as the direct cause of the tunnel deformation and failure,the additional load acting on the tunnel structure is obtained by the load transfer mechanism,and the calculation for⁃mula for external load on tunnels is derived through superimposing the additional load and the surrounding rock pressure.Using the elastic foundation beam theory,the calculation method for the tunnel internal forces under the action of the landslide thrust is derived,and thus obtaining the modes and calculation theory of stress and deforma⁃tion of the tunnel-portal landslide parallel system.Finally,the rationality of the proposed method is verified through model tests,showing that the method is consistent with actual projects,and providing references for the design of tunnels in portal landslide sections.

关 键 词：隧道-洞口滑坡 病害特征 地质模型 附加荷载 变形模式 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]