深基坑开挖邻近地下直径线变形控制加固措施研究  

Research on Deformation Control and Reinforcement Measures of Diameter Line Adjacent to Deep Foundation Pit Excavation

作　　者：米涛 Mi tao(the Fifth Engineering Co.,Ltd.of China Railway 18th Bureau Group,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：《石家庄铁路职业技术学院学报》2022年第2期20-24,共5页Journal of Shijiazhuang Institute of Railway Technology

摘　　要：目前对于基坑开挖造成邻近地铁变形的控制措施有多种,不同工况下具体采取哪种预处理措施能够有效减弱对地铁隧道造成的变形影响值得关注。依据天津深基坑邻近地下直径线工程建立相应的有限元模型,探究了坑底注浆加固和隔离桩加固两种措施的加固效果。结果表明:两种加固方案对于控制隧道结构的变形起到了不同程度的效果,直径线倾斜程度总体变小。隔离桩加固后各结构的位移变化变得均匀合理。隔离桩加固优于坑底注浆加固,尤其在降低结构竖向位移方面,直径线由隆起变形转变为下沉变形。At present,there are many control measures for the deformation of adjacent Metro caused by foundation pit excavation.It is worth paying attention to which pretreatment measures can effectively reduce the deformation impact on metro tunnel under different working conditions.According to the project of Tianjin deep foundation pit adjacent to the underground diameter line,the corresponding finite element model is established,and the reinforcement effects of grouting reinforcement and isolation pile reinforcement at the bottom of the pit are explored.The results show that the two reinforcement schemes have different effects on controlling the deformation of the tunnel structure,and the inclination of the diameter line decreases as a whole.After the isolation pile is reinforced,the displacement of each structure becomes uniform and reasonable.Isolation pile reinforcement is better than pit bottom grouting reinforcement,especially in reducing the vertical displacement of the structure,the diameter line changes from uplift deformation to subsidence deformation.

关 键 词：基坑开挖 位移 坑底注浆加固 隔离桩加固 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]