浅覆土顶管近距离上跨施工对既有运营地铁隧道扰动规律与控制研究  

Study of disturbance principles and control measures of shallow buried pipe jacking tunnel on existing operating metro tunnel by close upper crossing construction

作　　者：蒋礼平 贺维国 刘金晶 JIANG Liping;HE Weiguo;LIU Jinjing(China Railway Sixth Survey and Design Institute Group Corporation Limited,Tianjin 300308,China)

机构地区：[1]中铁第六勘察设计院集团有限公司,天津300308

出　　处：《现代城市轨道交通》2024年第7期80-86,共7页Modern Urban Transit

基　　金：中国中铁股份有限公司科技研究开发计划重大课题(2022-重大-19)。

摘　　要：顶管上跨施工会对既有运营地铁隧道产生扰动,开展顶管上跨施工对既有运营地铁隧道扰动规律与控制研究对于确保既有运营地铁隧道的安全与稳定具有重要意义。文章以南宁地铁5号线上跨施工为例,采用Midas-GTS进行三维数值模拟浅覆土顶管近距离上跨既有运营地铁隧道,分析顶管近距离施工引发地面沉降及临近盾构隧道变形与受力特征,探究并提出合理的变形控制措施。通过开展现场监测对比分析,验证变形控制措施的合理性,并及时采取注浆回纠等措施使地面沉降与地铁隧道变形控制在允许范围内。顶管洞通后通过顶管内预留的预应力管道将管节张拉为整体,进一步限制地铁隧道的上浮,且使顶管隧道本身的抗浮设计满足要求。相关研究可为其他类似顶管近距离上跨既有运营地铁工程施工提供参考和借鉴。The pipe jacking upper crossing construction would cause disturbance to the existing operating metro tunnels,and it is of great significance to carry out the research on the disturbance principles and control of pipe jacking upper crossing construction on the existing operating metro tunnels to ensure the safety and stability of the existing operating metro tunnels.Taking the pipe jacking upper crossing construction of Nanning metro line 5 as an example,the article adopts Midas-GTS to carry out three-dimensional numerical simulation of shallow buried pipe jacking close upper crossing existing operating metro tunnels,analyzes the ground settlement caused by the close construction of pipe jacking,and analyzes the deformation and force characteristics of the adjacent shield tunnels,and then investigates and puts forward the reasonable deformation control measures.Through on-site monitoring and comparative analysis,the reasonableness of the deformation control measures was verified,and measures such as grouting back to correct the ground settlement and metro tunnel deformation were taken in a timely manner to keep the ground settlement and metro tunnel deformation under control within the permissible range.After the completion of the jacking tunnelling,the pre-stressing pipe inside the jacking tunnel was used to tension the pipe sections as a whole,which further limited the uplift of the metro tunnel and made the anti-floating design of the jacking tunnel itself meet the requirements.The relevant research could provide reference and an example to build on for other similar pipe jacking construction by close upper crossing the existing operating metro projects.

关 键 词：地铁 大断面顶管隧道 上跨施工 变形控制 扰动规律 

分 类 号：TV6[水利工程—水利水电工程]