不同参数对于深基坑双排桩支护结构的变形影响研究

Research on spatial effect of double-row piles supporting structure for deep foundation pit

随着人们对空间需求的日益增大,地下空间的开发显得越来越重要,同时各种深大基坑也应运而生,而基坑作为空间结构体系,在开挖过程中存在空间效应的影响,许多学者研究发现,通过合理考虑基坑的空间特性可以使支护形式更加合理,针对阴阳角型双排桩支护结构,桩长、排距、桩径等因素对其空间效应影响显著,本文就双排桩支护结构的桩长、排距和桩径等参数,以及回弹指数进行了参数分析,根据青岛地铁项目,结合试验探讨了各因素对阴角及阳角型基坑不同位置处支护桩体变形,以及坑底回弹变形分布的影响。旨在通过基坑空间效应的研究以及不同参数对于双排桩支护结构变形影响的研究,为施工现场选择更加合理的支护结构,最大程度地减小坑壁侧移变形。

As people’s growing demand for space,the development of underground space is more and more important,it has also created all kinds of deep foundation pit,the pit as a space structure system,exist in the process of the excavation effect of space,many scholars study found that by reasonable considering the spatial characteristics of foundation pit supporting forms can be more reasonable,in view of the Yin and Yang Angle retaining structure with double-row piles,Pile length and row spacing,pile diameter on the space effect significantly,in this paper,the retaining structure with double-row piles of pile length,pile diameter and row spacing parameters,as well as the swelling index parameters are analyzed,according to the Qingdao metro project,combined with the experiment discusses the various factors on the Angle of Yin and Yang Angle deformation of foundation pit supporting pile in different location,and the distribution of the springback deformation of the bottom.The aim is to choose a more reasonable supporting structure for the construction site and minimize the lateral deformation of the pit wall through the study of the space effect of the foundation pit and the influence of different parameters on the deformation of the double-row pile supporting structure.