地铁车站深基坑开挖与邻近建筑物相互影响分析

Analysis of the Interactions Between the Deep Excavation of a Subway Station and Adjacent Buildings

为研究地铁车站深基坑开挖施工过程中围护结构、土体和邻近建筑物的相互作用特性,依托南昌地铁二号线地铁车站深基坑开挖侧穿邻近高层建筑物工程,采用有限元分析软件MIDASGTSNX建立三维仿真模型,对不同施工工况条件下的地下连续墙水平位移和受力特性、内支撑的受力特性、周围土体地表沉降和相邻建筑结构受力特性进行了模拟计算,并与无建筑物时的计算结果进行对比分析,得到了地铁车站基坑开挖与邻近建筑结构相互作用的力学特征,研究结果可为地铁车站深基坑的设计施工提供借鉴。

In order to study the influence of buildings on the deformation characteristics and mechanical behavior of the retaining structures during the excavation of the deep foundation pit of the adjacent subway station,and the interaction characteristics of the retaining structures,soil and the adjacent buildings during the excavation of the foundation site,this paper provides on the background of the deep excavation project of Nanchang Metro Line 2 subway station passing through the adjacent high-rise buildings.The finite element analysis software MIDASGTSNX is used to establish a three-dimensional simulation model of the deep excavation construction of the subway station and the adjacent buildings.The horizontal displacement and stress characteristics of the underground diaphragm wall,the stress characteristics of the internal support,the surface settlement of the surrounding soil and the stress characteristics of the adjacent building structures under different construction conditions are simulated and analyzed.The results are compared with the simulations results without buildings.The mechanical behavior characteristics of the interaction between the deep excavation of the subway station and the adjacent building structures are obtained.The comparative study results can provide a reference for the design and construction of the deep foundation pit of the subway station.