路基填筑施工和运营对下伏正交地铁的影响  

Influence of Subgrade Filling Construction and Operation on the Underlying Orthogonal Subway

作　　者：李军华 姜峰林 LI Junhua;JIANG Fenglin(CCCC Second Highway Engineering Co.,Ltd.,Xi'an 710065,China;Guangdong Shoucheng Construction Technology Co.,Ltd.,Guangzhou 511483,China)

机构地区：[1]中交第二公路工程局有限公司,西安710065 [2]广东首诚建设科技有限公司,广州511483

出　　处：《路基工程》2024年第3期131-137,共7页Subgrade Engineering

基　　金：广东首诚轻质材料应用研发重点项目(2022003)。

摘　　要：依托拟建某机场高速公路路基路面填筑项目,其下伏正交运营地铁盾构隧道,建立路基路面-下伏盾构隧道-地基土体的三维有限元数值模型,模拟地表路基堆载施工和运营、地铁隧道内部列车行驶耦合作用下,对盾构隧道与路基路面的力学响应。结果表明:在地表道路施工堆载作用下,盾构隧道拱顶、仰拱位置与EB-W模型解的最大值分别为30.0、20.6、27.2 mm,其最大沉降位置位于盾构隧道中线处,沉降曲线大致呈“V”字形,路基与盾构隧道交叉处-20~20 m区域的竖向变形处于“危险值”状态;地表路基堆载作用对盾构隧道拱腰水平位移影响不大,左右拱腰最大水平位移分别为-4.2、4.0 mm,均小于10.0 mm控制值;地表路基施工完成后,隧道的竖向应力最大值约1.7 MPa;路基完工后,路基中线最大沉降值位于其底部,达到7.0 cm。A three-dimensional finite element numerical model of subgrade pavement-underlying shield tunnel-subgrade soil was established based on the subgrade pavement filling project of a proposed airport expressway to simulate the mechanical response of shield tunnel and subgrade pavement under the coupling effect of subgrade loading construction,operation and train running inside the subway tunnel.The results show that under the action of loading in surface road construction,the maximum values of the vault and inverted arch position of the shield tunnel and the EB-W model solution are 30.0,20.6,27.2 mm,respectively,and the maximum settlement position is located at the middle line of the shield tunnel,and the settlement curve roughly presents a"V"shaped law,in particular,the vertical deformation between−20 and 20 m at the intersection of sungrade and shield tunnel is in the"dangerous value"state.The surface subgrade loading has little effect on the horizontal displacement of the arch waist of the shield tunnel,and the maximum horizontal displacement values of the left and right arch waists of the tunnel are−4.2 mm and 4.0 mm,respectively,which are less than 10.0 mm.After the construction of the surface subgrade,the maximum vertical stress value of the tunnel is about 1.7 MPa.After the completion of the subgrade,the maximum settlement value of the center line of the subgrade is located at the bottom of the subgrade,and its value reaches 7.0 cm.

关 键 词：地表路基 堆载及工后运营 下伏正交线路 数值模拟 工后沉降 变形 保护区域 

分 类 号：U416.1[交通运输工程—道路与铁道工程]