张家口某新建分离式隧道双侧壁导坑法工法可行性分析  

Feasibility Analysis of Two-side Wall Pit Guidance Method for a Newly Built Separated Tunnel in Zhangjiakou

作　　者：陈丰泽 陈岩 刘小军 CHEN Fengze;CHEN Yan;LIU Xiaojun(Hebei Key Laboratory of Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Hebei Zhangjiakou 075000,China;Hebei University of Architecture,Hebei Zhangjiakou 075000)

机构地区：[1]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075000 [2]河北建筑工程学院,河北张家口075000

出　　处：《河北建筑工程学院学报》2023年第3期44-49,共6页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：在隧道工程中,分离式隧道为重要的施工对象。依托张家口某新建分离式隧道实际情况,运用Midas/GTS软件建立三维有限元隧道模型,重点分析运用双侧壁导坑法对隧道开挖时的位移变化,判断其稳定性。得出了以下结论:随着施工阶段的进行,隧道拱顶沉降最大值前期逐渐增大,中期较前期增大66.7%,后期增长较慢并趋于稳定,最大值为14.18mm;仰拱隆起最大值前期增长较慢,中期较前期增长80.3%,后期在隆起值7.50mm时趋于稳定;地表沉降最大值呈线性趋势逐渐增大,最终达到5.79mm时趋于稳定;拱腰收敛最大值前期逐渐增大,中期趋于稳定,后期逐渐减小。隧道位移值均符合隧道施工规范要求,稳定性良好,故运用双侧壁导坑法工法施工方法可行。In tunnel engineering,separate tunnel is an important construction object.Based on the actual situation of a newly-built separated tunnel in Zhangjiakou,this paper establishes a three-dimensional numerical simulation model by using Midas/GTS finite element software,focusing on analyzing the displacement change of the tunnel excavation by using the double-side wall guide pit method,and judging its stability.The following conclusions are drawn:With the construction stage,the maximum settlement of tunnel vault gradually increases in the early stage,increases by 66.7%in the middle stage,and tends to be stable in the later stage,with the maximum value of 14.18 mm;The maximum value of upturned arch uplift increased slowly in the early stage,increased by 80.3%in the middle stage and stabilized in the later stage when the uplift value was 7.50 mm.The maximum value of surface subsidence increases gradually in a linear trend,and tends to be stable when it finally reaches 5.79 mm.The maximum convergence of arch waist gradually increased in the early stage,stabilized in the middle stage and gradually decreased in the later stage.The displacement values all meet the requirements of tunnel construction specifications and have good stability,so it is feasible to use the double-side wall guide pit method.

关 键 词：分离式隧道 开挖方法 数值模拟 

分 类 号：TU4[建筑科学—土工工程]