复杂孕灾环境下隧道进口斜坡稳定性分析与评价  

Stability Analysis and Evaluation of a Tunnel Entrance Slope Under Complex Disaster-Prone Environments

作　　者：徐正宣 林之恒[2] 刘云鹏[3] 聂晓芳 任利 张志龙 XU Zhengxuan;LIN Zhiheng;LIU Yunpeng;NIE Xiaofang;REN Li;ZHANG Zhilong(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Power China Chengdu Engineering Corporation Limited,Chengdu 610072,China;MOE Key Laboratory of Deep Earth Science and Engineering,Sichuan University,Chengdu 610065,China;College of Resource and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031 [2]中铁二院工程集团有限责任公司,四川成都610031 [3]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [4]四川大学深地科学与工程教育部重点实验室,四川成都610065 [5]四川大学水利水电学院,四川成都610065

出　　处：《西南交通大学学报》2024年第5期1068-1077,1085,共11页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(42171355)。

摘　　要：高地震烈度、高地应力、高陡、高寒等复杂孕灾环境下的隧道洞口斜坡,在降雨、强震或人类强烈工程活动影响下,极易发生崩塌、滑坡、泥石流等地质灾害.为探究复杂孕灾环境下隧道进口斜坡在不同工况条件下的稳定性,以我国西南某加日山隧道为依托,通过无人机摄影、槽探、室内实验及洞探原位测试等“天空地”一体化勘察技术,实现斜坡工程地质信息精细获取,系统揭示斜坡典型破坏特征,讨论斜坡2种破坏成因与演化模式,在此基础上,利用极限平衡法与三维数值模拟方法,量化分析不同工况下的斜坡稳定性.研究结果表明:加日山隧道进口斜坡在自然工况、暴雨工况、地震工况3种工况下稳定性系数均大于1.15,斜坡整体处于稳定状态,仅后缘表部存在局部变形失稳的可能,成果可为类似隧道的选线规划以及建设运营安全提供理论指导和技术支撑.Influenced by rainfall,strong earthquakes,and intensive engineering activities,the slope at the tunnel entrance may experience collapses,landslides,debris flows,and other geological disasters,especially under the complex conditions of violent earthquakes,high geostress,abrupt slopes,and extremely cold environments.To explore the stability of tunnel entrance slopes under different working conditions in complex disaster-prone environments,the Jiarishan tunnel in southwest China was taken as an example,and a “ space-air-ground”integrated investigation technology combining unmanned aerial vehicle(UAV) photography,surface trenching,laboratory experiments,field tests,and cave surveys was employed to obtain accurate engineering geological information.Typical failure characteristics of the studied slope were systematically revealed,and the two failure causes and evolution models of the slope were discussed.In addition,the slope stability under different working conditions was qualitatively analyzed using the limit equilibrium method and three-dimensional numerical simulation.The results indicate that the stability factor of the slope at the Jiarishan tunnel entrance is always greater than 1.15 under natural,rainstorm,and earthquake working conditions.Overall,the slope is stable except for the local deformation and instability of the shallow horizon of the posterior margin.This research can provide theoretical guidance and technical support for similar tunnels in terms of siting,construction,and operation safety.

关 键 词：孕灾环境 斜坡变形 演化模式 稳定性分析 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]