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与既有地铁结构临近深大基坑的支护设计因受到各种因素的影响,极易出现支护设计过于冒进或过于保守两种情况。本文探讨的与地铁临近深大基坑支护设计的优化方法,在阐述基坑支护设计优化方案的同时,根据拟建基坑与紧邻地铁结构在空间上的位置关系,将此类型基坑又细分为拟建基坑位于地铁隧道上方、拟开挖基坑位于地铁结构一侧开挖深度小于地铁结构基础埋深及基坑开挖深度大于地铁埋深三种类型。明确了设计优化阶段的划分及流程,并通过案例介绍,指出通过对多个单项工程优化经验的积累,可进一步提高该类型基坑支护设计的整体水平。
Due to the influence of various factors, the support design of the deep foundation pit near the existing metro structure is prone to appear too aggressive or overly conservative. In this paper, the optimization method of the support design for the deep foundation pit adjacent to the subway is discussed. In the meantime, the optimization design of the foundation pit support design is described. According to the spatial relationship between the proposed foundation pit and the adjacent subway structure, Further subdivided into the proposed foundation pit is located above the subway tunnel, excavation foundation pit is located on the side of the subway structure excavation depth is less than the depth of the foundation of the subway structure and excavation depth greater than the depth of the subway three types. The division and process of design optimization stage are clarified. Through case introduction, it is pointed out that the overall level of support design for this type of foundation pit can be further improved through the accumulation of optimization experience of several individual projects.