城市地下立交枢纽超大断面隧道围岩稳定性研究  

Research on the Stability of Surrounding Rock in Super-Large Section Tunnels of Urban Underground Interchange Hubs

作　　者：王海东 WANG Haidong(China Railway 12th Bureau Group Co.Ltd.,Taiyuan Shanxi 030024,China)

机构地区：[1]中铁十二局集团有限公司,山西太原030024

出　　处：《铁道建筑技术》2024年第12期186-189,共4页Railway Construction Technology

基　　金：中铁十二局集团有限公司科技研发计划项目(集团公司2019研-53号)。

摘　　要：在城市公路网快速发展背景下,四车道及以上超大断面公路隧道日益增多,其节理对围岩稳定性影响显著。为探究贯穿节理对围岩稳定性的影响因素,以蔡尖尾山隧道为工程依托,采用室内试验、数值模拟方法,研究不同节理构成下围岩变形破坏特征。结果表明:当围岩仅有单向节理时,围岩稳定性对不同向节理敏感程度存在差异,大小为X向>Z向>Y向(隧道横断面水平向为X向,竖向为Y向,隧道轴向为Z向);围岩在双向节理组合下,当X向节理与Y向节理组合或X向节理与Z向节理组合时分别由对应双向节理的倾角共同决定围岩是否发生失稳破坏,当Y向节理与Z向节理组合时主要由Z向节理倾角决定;节理相关参数对隧道稳定性影响由大到小依次为摩擦角、法向刚度、切向刚度、黏聚力,安全系数与上述各参数呈正相关。In the context of the rapid development of the urban highway network,the number of the super-large section highway tunnels with four or more lanes is increasing,and their joints have a significant impact on the stability of the surrounding rock.To explore the influencing factors of through joints on the stability of surrounding rock,this paper takes Caijianweishan Tunnel as the engineering support and adopts the methods of indoor experiments and numerical simulations to study the deformation and failure characteristics of surrounding rock under different joint compositions.The results show that when there is only one-way joint in the surrounding rock,the sensitivity of the stability of the surrounding rock to different directions joint varies,with the order of X direction>Z direction>Y direction(the horizontal direction of the tunnel cross-section is X direction,the vertical direction is Y direction,and along the axial direction of the tunnel is Z direction).Under the combination of two-way joints in the surrounding rock,when the X-direction joint is combined with the Y-direction joint or the X-direction joint is combined with the Z-direction joint,the instability and failure of the surrounding rock are respectively determined by the inclination angles of the corresponding two-way joints.When the Y-direction joint is combined with the Z-direction joint,it is mainly determined by the inclination angle of the Z-direction joint.The influence of joint-related parameters on the stability of the tunnel from large to small is as follows:friction angle,normal stiffness,tangential stiffness,and cohesion,and the safety factor is positively correlated with each of the above parameters.

关 键 词：超大断面隧道 围岩变形 节理 稳定性 数值模拟 

分 类 号：U451[建筑科学—桥梁与隧道工程]