斜撑拆除对地表沉降和管幕竖向变形的影响分析

Study the influence of the number of dismantling braces on ground settlement and the vertical deformation of pipe-roof

沈阳地铁某车站采用新型管幕工法结合洞桩法施工,在开挖管幕下方土体时,为了保持管幕的整体稳定性,在管幕的两侧架设斜撑。通过建立三维有限元模型,研究同时拆撑数对地表沉降及管幕竖向变形的影响规律,得出采取拆除6根斜撑作为一个施工步骤的施工方案。

A new pipe-roof combined with pile-beam-arch is used to constructed the subway station in Shenyang. The temporary supports are installed to ensure the stability of both the horizontal ends of pipe-roof. The 3-dimensional finite element model is introduced to study the influence of the number of dismantling braces on ground settlement and the vertical deformation of pipe-roof,and it is obtained that six temporary supports are removed,which is the optimum construction schedule.