地表埋深对大跨径地铁隧道变形影响分析  

Analysis on the Influence of Surface Buried Depth on the Deformation of Long-span Metro Tunnels

作　　者：李星 龚贵友 何俊雄 LI Xing;GONG Guiyou;HE Junxiong(CISDI Urban Construction(Chongqing)Co.,Ltd.,Chongqing 401122,China;CMCU Engineering Co.,Ltd.,Chongqing 400041,China)

机构地区：[1]中冶赛迪城市建设(重庆)有限公司,重庆401122 [2]中机中联工程有限公司,重庆400041

出　　处：《黑龙江交通科技》2024年第11期126-130,共5页Communications Science and Technology Heilongjiang

摘　　要：以预留中岩柱施工的浅埋大跨径地铁隧道为背景,采用了有限元数值分析的方法,分析了不同埋深条件下地铁隧道的竖向位移和水平位移的变化特征,得出以下结论:(1)随着地表埋深的增加,地表沉降、拱顶沉降和周边收敛的累计值会逐渐增加。地下工程施工存在压力拱效应,当地表埋深大于1.5D(D为隧道开挖跨度)时,位移的相对变化率显著降低。(2)在地表埋深1D~2D范围内,地表中心沉降、拱顶沉降和周边收敛的最大值分别由-7.13、-11.28、3.57 mm增加至于-12.73、-22.3、5.64 mm,相对增加了78.54%、97.7%和57.98%。竖向位移受地表埋深的影响最大。(3)以10%的相对变化率作为位移变形稳定的基础,因此,二衬施作对稳定洞内变形有明显作用。埋深变化对洞周位移的相对变化率基本没有影响。Taking the shallow buried long-span subway tunnel with medium rock column as the background,the finite element numerical analysis method is used to analyze the change characteristics of vertical and horizontal displacement of subway tunnel under different buried depths.The following conclusions are drawn:(1)With the increase of surface buried depth,the cumulative values of surface settlement,vault settlement and peripheral convergence will gradually increase.There is pressure arch effect in underground engineering construction,when the surface buried depth is greater than 1.5 D(D is the tunnel excavation span),the relative change rate of displacement decreases significantly.(2)In the range of 1 D~2D buried depth,the maximum values of surface center settlement,vault settlement and peripheral convergence increased from-7.13,-11.28,3.57 mm to-12.73,-22.3,5.64 mm,respectively,with a relative increase of 78.54%,97.7%and 57.98%.The vertical displacement is most affected by the depth of the ground.(3)The relative change rate of 10%is used as the basis for the stability of displacement and deformation,so the second lining has an obvious effect on stabilizing the deformation in the cavity.The change of burial depth has no effect on the relative change rate of displacement around the hole.

关 键 词：地铁隧道 数值模拟 预留中岩柱法 地表沉降 洞周变形 

分 类 号：U455[建筑科学—桥梁与隧道工程]