水平地震作用下含软弱夹层隧道顺层仰坡稳定性因素分析  

Analysis of stability factorsfor layered tunnel slopes with weak interlayers under horizontal seismic action

作　　者：隋传毅 冯艺 艾庆华 闫高明[3] Sui Chuanyi;Feng Yi;Ai Qinghua;Yan Gaoming(State Key Laboratory of Me-chanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,Hebei,China;Shijiazhuang Tiedao University Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang,Hebei Province,050043,China;Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [3]北京交通大学,北京100044

出　　处：《土木工程学报》2024年第S2期102-107,共6页China Civil Engineering Journal

基　　金：海底隧道建造与韧性增强关键技术(2021YFB2600800);石家庄铁道大学2022年度土木工程学院自主课题(TMXN2210);中央高校基本科研业务费专项资金资助(2023XKRC021)。

摘　　要：本文深入分析了地震环境下含软弱夹层隧道顺层仰坡稳定性,通过考察软弱夹层岩体抗拉强度与Ⅰ型、Ⅱ型断裂能量释放关系,并利用错动实验验证了分析方法的有效性。研究融合理论、实验与数值模拟,探讨了软弱夹层厚度及坡形结构对稳定性的影响。发现上覆层厚度对坡顶加速度影响显著,增厚可显著降低加速度,提升稳定性;坡高主要影响水平加速度,而坡度则对垂直加速度有较大影响。研究结果对理解和提高地震作用下隧道顺层仰坡稳定性具有重要理论和实际意义,为隧道设计与改进提供指导。This study investigates the stability of layered slopes with weak interlayers in tunnels subjected to seismic activities.It delves into the relationship between the tensile strength of the weak interlayer and the transitions in the energy release rate during Mode I and II failures.Using model tests to match experimental data with numerical model findings,significant consistency in deformation validates the reliability of the reliability.The research integrates a mechanical model with theoretical considerations,experiments,and simulations to assess the impact of variables like interlayer thickness and slope geometry on stability against seismic forces.It’s found that the thickness of the overburden crucially influences the peak accelerations at the slope’s surface,with an increase in thickness markedly enhancing stability by reducing accelerations.Variation in slope height affects horizontal accelerations more than vertical ones,suggesting more lenient height requirements for slopes under 30 meters when considering seismic forces.Moreover,the slope angle primarily impacts vertical acceleration with minimal effects on horizontal acceleration.This paper provides foundational insights and guidance for bolstering tunnel slope stability under seismic conditions,serving as a valuable resource for design and improvement strategies.

关 键 词：隧道抗震 稳定性因素分析 含软弱夹层顺层仰坡 能量释放率 扩展有限元法 

分 类 号：U452[建筑科学—桥梁与隧道工程]