紧邻铁路线路地铁站基坑施工过程变形分析

Deformation Analysis on the Construction of Foundation Pit of Subway Station Adjacent to Railway Line

地铁明挖车站施工邻近铁路轨道时,两者之间往往会产生相互的负面影响,对于施工的安全以及铁路的正常运营造成影响。以南昌市轨道交通3号线上沙沟站基坑施工为背景,分析了其在基坑开挖过程中对紧邻铁路线路的影响。通过有限元建模,建立了地铁车站基坑开挖及铁路路基相互关系的三维有限元分析模型,对施工过程中铁路运营与基坑施工相互作用下地表沉降、支护体系内力以及铁路轨道沉降的变化规律进行了分析。最后结合实际施工监测数据进行对比,验证了有限元数值模型的可靠性与准确性。研究成果为今后类似工程的变形预测以及相互作用分析提供参考借鉴。

When subway open-cut station is constructed near railway tracks,the two often have a negative impact on each other,which has an impact on the safety of construction and the normal operation of the railway.Based on the construction of the foundation pit of the Shangshagou Station of line 3 of Nanchang Subway,the influence of foundation pit excavation on adjacent railway lines was analyzed.Through the finite element modeling,the 3-D FEA model of the relationship between foundation pit excavation and railway subgrade in subway station was established,and the variation laws of ground settlement,internal force of support system and railway track settlement under the interaction between railway operation and foundation pit construction during construction were analyzed.Finally,the reliability and accuracy of the finite element numerical model were verified by comparing the actual construction monitoring data.The research results can be used as reference for the deformation prediction and interaction analysis of similar projects in the future.