天津地铁昆明路站基坑围护结构监测研究

Research on Support Structure Monitoring of Excavation Pit in Kunminglu Station of Tianjin Subway

针对城市地铁深基坑工程事故易发的现状,结合天津地铁3号线昆明路站深基坑监测方案,通过大量实测数据对基坑的围护体结构定向位移和支撑轴力进行了研究,分析墙体变形及钢支撑轴力变化的原因。通过监测分析表明:围护结构随着支撑的架设,水平位移部位下移;钢支撑内力变化不是单调递增,呈现反复变化的现象,底板浇注完成后,基坑变形趋于稳定。昆明路站基坑工程的现场施工监测是安全施工的重要保证,可为类似城市地下工程的安全施工提供有益的借鉴和参考。

Aiming at the accident easy-happening status of subway station deep excavation pit projects,this paper makes research on a large number of field-tested data pit horizontal deformations and steel support axial force to analysis the variation reason of them based on monitoring program in Tianjin Subway Line 3,Kunming Road station.The monitoring shows： the horizontal deformation shifts down with the Support finished;steel support variation changes repeatedly instead of monotone increasing;pit variation keeps stable with bottom casting is complete.The construction monitoring of Kunming Road Station pit project is an important safety guarantee for the safety construction and can provide a useful reference and reference for similar urban underground projects.