基于有限元强度折减法的浅埋黄土隧道极限位移研究  

Study on Limit Displacement of Shallow Buried Loess Tunnel Based on Finite Element Strength Reduction Method

作　　者：蒋德武 王娜 JIANG De-wu;WANG Na(Chongqing Municipal Design and Research Institute Co Ltd,Chongqing 400020,China;School of Civil Engineering,Chongqing College of Engineering,Chongqing 400056,China)

机构地区：[1]重庆市市政设计研究院有限公司,重庆400020 [2]重庆工程学院建筑工程学院,重庆400056

出　　处：《五邑大学学报（自然科学版）》2023年第2期65-72,共8页Journal of Wuyi University(Natural Science Edition)

基　　金：重庆市教委科学技术研究资助项目(KJQN202001909)。

摘　　要：为了探究黄土隧道变形特性,基于有限元强度折减法,建立了隧道在不同埋深条件下的有限元模型,进行了隧道穿越青海东部地区黄土地层时的极限位移值研究.结果表明:在同一埋深条件下,随着折减系数的增大,隧道洞周的变形不断增大,当达到某一临界值时,位移出现突变;隧道埋深10 m,其安全系数为2.6,拱顶沉降极限位移值为10.3 mm,墙腰水平收敛极限值为14.2 mm;隧道埋深30 m,其安全系数为2.2,拱顶沉降极限位移值为26.0 mm,墙腰水平收敛极限值为46.4 mm;隧道埋深50 m,其安全系数为2.0,拱顶沉降极限位移值为36.8 mm,墙腰水平收敛极限值为52.7 mm.结论可为有类似工程地质条件隧道设计、施工、监测提供参考.Based on finite element strength reduction method,the finite element model of the tunnel under different buried depth is established and the limit displacement value of the tunnel in differentburied depth is obtained.Results show:Under the condition of the same depth,with the increase of the reduction coefficient,the deformation of the tunnel is increasing.When the critical value is reached,the displacement occurs;When the tunnel depth 10 m,the safety factor is 2.6,the vault settlement limit displacement value is 10.3 mm,the limit value of the wall waist level convergence is 14.2 mm;When the tunnel depth 30 m,the safety factor is 2.2 the vault settlement limit displacement value is 26.0 mm,the limit value of the wall waist level convergence is 46.4 mm;When the tunnel depth 10 m,the safety factor is 2.0,the vault settlement limit displacement value is 36.8 mm,the limit value of the wall waist level convergence is 52.7 mm;The conclusion can provide reference for the design,construction and monitoring of the tunnel.

关 键 词：黄土地层 极限位移 强度折减 位移突变 隧道 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]