富水砂层小净距盾构隧道端头井加固技术数值模拟分析  

Numerical Simulation Analysis of Reinforcement Technology of Small Spacing Shield Tunnel End Shaft in Water-rich Sand Layers

作　　者：陈鹏[1] Chen Peng(China Railway 18th Bureau Group Third Engineering Co.,Ltd.,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《市政技术》2024年第9期152-159,共8页Journal of Municipal Technology

基　　金：中国铁建股份有限公司2022年度科技研究开发计划及资助课题(2022-C1);中铁十八局集团有限公司2022年度科研创新项目(C2022-051)。

摘　　要：盾构始发接收在隧道掘进过程中是十分关键的环节,因此,针对富水粉砂土层中三线小净距隧道盾构掘进中始发接收端头井处的加固措施展开了数值模拟研究。其结果表明:小净距隧道施工时地下水的存在会增大地表沉降量,而采用水泥系和冻结法联合加固,则能够同时减小地表沉降量以及沉降分布范围;此外,端头井的重复施工会影响地下水的流场分布,进而降低地层承载力;冻结法加固可有效保持地下水位,减小渗流和地表沉降。Shield launching and reception are very critical in the tunneling process.Numerical simulation of the reinforcement measures at the end shaft of the three-lane small-clearance tunnel shield tunneling in water-rich silt sand layer were studied.The results show that the groundwater increase the surface settlement during the construction.The combined reinforcement of cement system and freezing method can simultaneously reduce the amount of surface settlement and the range of settlement distribution;In addition,the repeated construction of the end shaft affects the distribution of the groundwater flow field and reduces the bearing capacity of the strata;Reinforcement by freezing method can effectively maintain the groundwater level and reduce seepage and surface settlement.

关 键 词：盾构隧道 端头井加固 冻结加固 地表沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]