随着城市化规模的不断发展,盾构施工扰动诱发的既有建筑沉降问题已经成为环境安全评估关注的核心问题。针对盾构施工全过程诱发的筏板基础建筑横向沉降、纵向沉降及扭转变形,采用FLAC3D有限差分软件进行深入研究,将盾构施工扰动平面影响区域划分为忽略影响区、过渡区和危险影响区。结果表明:建筑横、纵向平均沉降影响区呈抛物线分布,横向整体倾斜影响区呈半椭圆形分布,纵向整体倾斜影响区呈类抛物线分布,而扭转变形影响区呈类圆形分布;盾构施工全过程中,建筑横向平均沉降、横向整体倾斜及纵向平均沉降最大值发生在盾构穿越完成阶段,而当盾构掘进至建筑附近区域时,建筑纵向整体倾斜及扭转变形已发展到最大值,表明盾构穿越既有建筑沉降安全评估应重视盾构施工过程性。研究成果可为城市密集区盾构施工环境安全性评估提供理论依据。
With continuous development of urbanization, the settlement of existing buildings induced by shield construction disturbances has become a core issue of concern for environmental safety assessment. For the transverse settlement, longitudinal settlement and twist deformation of the raft foundation building induced by the whole process of shield construction, FLAC3D finite difference software is used for in-depth study, and the shield construction disturbance plan affected zone has been divided into negligible affected zone, transition zone and dangerous affected zone. The results show that the average transverse and longitudinal settlement affected zones of buildings are parabolic, the transverse overall tilt affected zone is semi-elliptical, the longitudinal overall tilt affected zone is quasi-parabolic and the twist deformation affected zone is quasi-circular. During the shield construction process, the maximum values of transverse average settlement, transverse overall tilt and longitudinal average settlement of the building occur at the completion of the shield crossing, the overall longitudinal tilt and twist deformation of the building will have reached a maximum by the time the shield reaches the central part of the building, which indicates that the assessment of the safety of existing building settlement in shield crossing construction should pay attention to the process of shield construction. The results of the study can provide a theoretical basis for assessing the environmental safety of shield construction in dense urban areas.
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