大型深基坑明挖顺作产生的地面沉降研究

The Surface Settlement of Large-scale and Deep Foundation Pits Excavation by the Bottom-up Method

随着城市现代化建设的快速发展和建设用地的不断缩小,地下空间的开发利用越来越广泛,基坑规模和开挖难度也随之增加,明挖顺作开挖已成为深大基坑开发利用的重要手段。本文在介绍基坑开挖导致地面沉降的理论基础上,以深圳广深港客运专线福田站基坑为工程背景,应用有限元软件ABAQUS做辅助计算,对实际监测数据进行分析,阐明了明挖顺作基坑开挖导致地面沉降的整个过程,以及支护结构刚度,建筑物本身和土体参数,尤其是泊松比对地面沉降的影响,总结了大型深基坑明挖顺作开挖产生的地面沉降规律,为今后该地区的基坑工程提供参考。

With the rapid development of city modernization and the shrinking of construction land,the size and difficulty of foundation pit excavations are increasing,and the bottom-up excavation method has become an important means of exploring large-scale and deep foundation pits.This paper analyses the actual monitoring data of FuTian station foundation pit of Guang-Sehn-Gang Line,and uses ABAQUS to make auxiliary calculation,based on introducing the theory of surface settlement caused by foundation pit excavation.What's more,it describes the process and the affecting factors of surface settlement caused by excavation,such as the stiffness of support structure,parameters of building and soil,etc,and summarizes the rules of surface settlement,and also provides the reference in future foundation pit engineering in this area.