关键词: 既有地铁, 卸荷, 地层-结构模型, 荷载-结构模型, 差异变形, 力学分析

Abstract:

Due to the action of foundation reactions, the unloading of the soil above or around existing Metro structures may cause the Metro structures to displace toward the excavation face, which may in turn result in the influence of the differential settlement on the rail operation and the influence of the deformation on the service condition of the Metro structure. The case of foundation pit excavation above station is simulated by FLAC3D and SAP2000 to analyze the deformation and internal force development rule of the station structure and assess the degree of the influence on the structure and operation safety of the Metro works. The paper can be served as reference for similar projects in the future.

Key words: existing Metro structure, unloading, stratastructure model, loadstructure model, differential deformation, mechanical analysis