深切峡谷桥隧相连的岸坡稳定性研究  

Study on the Stability of Bank Slope Connected by Bridge and Tunnel in Deep Canyon

作　　者：李冰 LI Bing(China Railway Construction Kunlun Investment Group Co.Ltd.,Chengdu Sichuan 610040,China)

机构地区：[1]中国铁建昆仑投资集团有限公司,四川成都610040

出　　处：《铁道建筑技术》2024年第9期90-93,102,共5页Railway Construction Technology

基　　金：国家自然科学基金资助项目(52378425);中国铁建昆仑投资集团有限公司科技研发项目(202201)。

摘　　要：在深切峡谷修建大型桥梁,岸坡的稳定性分析对桥梁设计、施工及后期运营安全都非常重要。以两端与隧道相连的乌长高速金旗特大桥工程为研究背景,对其所处深切峡谷的两岸坡的地形、地貌、地层岩性、水文及地质等进行了分析,确定不良地质为陡崖卸荷带、危岩、崩塌堆积体等;并在此基础上采用二维离散元、强度折减、极限平衡理论等方法,对天然、暴雨、天然+施工荷载、暴雨+施工荷载、暴雨+地震+施工荷载等工况下岸坡稳定性进行数值分析及综合安全评价;对不良地质采取刷方清除、锚固+灌浆封闭、挂网防护、设置拦石墙或挡墙等处治方案,为下一步桥梁深度设计给予支撑;相关经验可为类似深切峡谷岸桥隧相连的坡稳定性研究提供参考。In the construction of large bridges in deep canyons,the stability analysis of bank slope is very important for bridge design,construction and later operation safety.Based on the research background of the Jinqi Bridge project connected by tunnels at both ends of the Wudang⁃Changshun Expressway,the topography,geomorphology,stratigraphic lithology,hydrology and geology of the slopes of both sides of the deep canyon are analyzed,and the bad geology is determined to be cliff unloading zone,dangerous rock,collapse accumulation body,etc.On this basis,the numerical analysis and comprehensive safety evaluation of bank slope stability under natural,rainstorm,natural+construction load,rainstorm+construction load,rainstorm+earthquake+construction load are carried out by using two⁃dimensional discrete element,strength reduction,limit equilibrium theory and other methods.Treatment schemes such as brush clearing,anchoring+grouting sealing,hanging net protection,and setting stone wall or retaining wall are adopted for unfavorable geology to support the depth design of the bridge in the next step.The relevant experience can provide reference for the research on stability of bank slope connected by bridges and tunnels in similar deep canyons.

关 键 词：深切峡谷 桥隧相连 堆积体 危岩 岸坡稳定性 

分 类 号：U442.2[建筑科学—桥梁与隧道工程] U443.88[交通运输工程—道路与铁道工程]