超大基坑施工对周边环境影响的研究

Study on Influence of Super Large Foundation Pit Construction on Surrounding Environment

随着基础设施的大量兴建,城市内可利用的地上空间越来越少。地下空间成为城市发展的重要方向,深基坑工程是地下空间建设的重要课题。与其他结构形式相比较,深基坑的支护结构直接受到所在地水文地质条件的影响,其施工对周边环境的影响是工程界研究的重难点。采用数值模拟的方法,分析了某超大基坑开挖的全过程。经过对支护结构的沉降、支撑体系的轴向力、立柱桩的竖向沉降等因素的分析,评估了该基坑施工对周围环境的影响,为基坑支护的设计提供了依据,也为基坑工程施工提供了参考。

With the massive construction of infrastructure, there is less and less space on the ground available in the city. Underground space has become an important direction of urban development, and deep foundation pit engineering is an important topic of underground space construction. Compared with other structural forms, the supporting structure of deep foundation pit is directly affected by the local hydro-geological conditions, and the impact of its construction on the surrounding environment is the most important and difficult point of engineering research. The whole excavation process of a super large foundation pit is analyzed by numerical simulation. Through the analysis of the settlement of supporting structure, the axial force of supporting system, the vertical settlement of column pile and other factors, the impact of the foundation pit construction on the surrounding environment is evaluated, which provides a basis for the design of foundation pit support and a reference for the construction of foundation pit engineering.