深厚砂层泵站施工对盾构隧道结构安全影响分析  

The Effect of Pump Station Construction on Shield Tunnel Structure Security in Thick Sand

作　　者：王强[1] WANG Qiang(China Railway 18th Bureau Group No.5 Engineering Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300450

出　　处：《国防交通工程与技术》2024年第2期66-70,共5页Traffic Engineering and Technology for National Defence

摘　　要：基于石家庄复兴大街市政化改造工程,采用有限元数值模拟研究了位于砂层的深大泵站施工对侧方的地铁盾构隧道的变形和受力影响。结果表明:侧上方深基坑开挖对邻近的地铁盾构隧道的竖向变形影响表现为先沉降后隆起,在基坑开挖至坑底时隆起达到最大,水平变形影响表现为隧道向基坑开挖侧偏移,且在泵站开挖至基底时隧道的水平位移达到最大;受侧方基坑开挖卸载影响,隧道由均匀对称受力变化为承受一定程度的水平偏压,故隧道弯矩出现一定范围的增大,但变幅较小,在容许范围以内。提出了控制地铁盾构隧道变形的措施,保证了施工的顺利进行。Based on municipalization reconstruction project of Shijiazhuang Fuxing avenue,deformation and stress effect of shield tunnel induced by adjacent deep pump station construction is studyed in this paper.The research result shows that nearby deep foundation excavation causes shield tunnel to subside firstly and then uplift in vertical deformation.Additionally,the horizontal deformation of the tunnel is toward the inside of foundation pit.The uplift deformation and horizontal deformation are at their maximum when the excavation reaches the bottom of the foundation pit.In addition,the excavation causes lateral soil pressure on the nearby side of tunnel to decrease,and stress situation of tunnel changes from symmetrical compression to eccentric compression.Therefore,the bending moment of tunnel structure increases to some extent,but the change amount is small and within the acceptable range.At last,some measures are put forward to control deformation of shield tunnel to ensure the smooth construction.

关 键 词：泵站 盾构隧道 深厚砂层 基坑 变形分析 有限元计算 

分 类 号：U458[建筑科学—桥梁与隧道工程] U455.43[交通运输工程—道路与铁道工程]