邻近边坡地铁车站深基坑施工工法比选

Comparison and selection on construction methods for deep foundation pit of subway station adjacent to the slope

为对邻近边坡深基坑选取最优施工工法,以长沙地铁4号线黄土岭站基坑工程为背景,采用FLAC 3D对不同施工工法下基坑开挖支护进行了三维数值模拟。通过对比分析不同施工工法下支护结构的受力性状,并综合对比经济投入、施工和施工对周边环境影响等因素,确定了黄土岭站基坑采用半盖挖法且盖板设置在远坡侧的施工工法,并将其应用于该车站基坑施工中。实测数据分析表明,该施工工法实施过程中基坑始终处于安全状态。研究成果可为类似工程的设计和施工提供借鉴和参考。

In order to select the optimal construction method for deep foundation pit adjacent to the slope,taking Huangtuling station foundation pit project of Changsha Metro Line 4 as the background,FLAC 3D was used to carry out numerical simulations of foundation pit excavation and support under different construction methods.By comparing and analyzing the mechanical behavior of the supporting structure under different construction methods,and comprehensively comparing factors such as economic investment,construction and impact of construction on the surrounding environment,the construction method of Huangtuling station foundation pit adopting semi-covered excavation with cover plate installed on the side of the far slope was determined,and it was applied to the station foundation pit construction.Analysis of the measured data shows that the foundation pit is always in a safe state during the implementation of the construction method.The results of the study can provide reference for design and construction of similar projects.