滑坡参数反演成果在隧道洞口边仰坡评价中的应用与研究  

Application and Research of Landslide Parameter Inversion Results in Slope Evaluation of Tunnel Entrance

作　　者：吴强 赵东平[2,3] 杨帆 WU Qiang;ZHAO Dongping;YANG Fan(Hainan Communications Planning Surveying and Designing Institute Co.,Ltd.,Haikou 570206,Hainan,China;Key Laboratory of Transportation Tunnel Engineering,the Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;Xinjiang Communications Construction Group Co.,Ltd.,Urumqi 830063,Xinjiang,China)

机构地区：[1]海南省交通规划勘察设计研究院有限公司,海南海口570206 [2]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [3]西南交通大学土木工程学院,四川成都610031 [4]新疆交通建设集团股份有限公司,新疆乌鲁木齐830063

出　　处：《隧道建设(中英文)》2024年第S2期93-100,共8页Tunnel Construction

摘　　要：随着城市空间的不断扩展,城市道路山体隧道洞口穿越顺层边坡情况不可避免。川东地区山体滑坡等地质灾害频发,为了安全合理地解决穿越顺层边坡的洞口边仰坡方案设计问题,对某隧道洞口附近道路路堑边坡滑移案例进行补充勘察与现场踏勘,首先分析边坡滑移产生的机制,然后采用传递系数法与强度折减法分别进行反演计算,并与验证滑动面土体抗剪强度参数,并采用三维有限元数值模拟方法对洞口仰坡的稳定性进行评价。结果表明:1)传递系数法反演与强度折减法得到的安全系数接近,说明滑坡参数反演成果适用于附近隧道洞口边仰坡三维数值模型计算;2)隧道洞口顺层边仰坡处受力复杂,数值模拟稳定性计算时未考虑隧道结构与支护对边仰坡的作用,对稳定性计算结果影响有限;3)后续施工的地面变形监测结果与三维数值模拟计算结果接近,说明采用滑坡反演参数能够合理模拟顺层边仰坡稳定性计算,验证了洞口边仰坡设计方法的合理性、准确性和可靠性。Geological disasters such as landslides occur frequently in eastern Sichuan,and with the continuous expansion of urban space,it is inevitable for urban road mountain tunnel openings to cross bedding slopes.To find a safe and rational design method for the side slope of the tunnel opening through bedding slope,a supplementary investigation and site survey are conducted on the side slop sliding of a road near a tunnel opening,the mechanism of slope sliding is analyzed.Then,the transfer coefficient method and strength reduction method are used to invert and verify the shear strength parameters of the sliding surface soil.Finally,a three-dimensional finite element numerical simulation of the tunnel entrance slope is established to carry out the stability evaluation of the tunnel entrance slope.The results show the following:(1)The safety coefficient obtained by the transfer coefficient inversion method is close to that obtained by the strength reduction method,indicating that the inversion results of landslide parameters can be applied to the three-dimensional numerical model calculation of the side slope of the tunnel entrance.(2)The forces at the side elevation slope of the tunnel entrance are complicated,and the effect of tunnel structure and support on the side elevation slope is not considered in the numerical simulation stability calculation,which has limited impact on the stability calculation results but can enhance the safety measures at the entrance.(3)The ground deformation monitoring results of subsequent construction are close to the calculated data of the three-dimensional numerical model,indicating that the landslide inversion parameters can reasonably simulate the stability calculation of the real side slope along the bed,and verify the rationality,accuracy,and reliability of the design and construction of the side slope of the tunnel entrance and the finite element simulation method.

关 键 词：隧道洞口 滑坡 顺层边坡 抗剪强度 强度参数 

分 类 号：U45[建筑科学—桥梁与隧道工程]