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以兰州市地铁1号线一期工程世纪大道车站深基坑工程为依托,介绍该工程拟建场区的周边环境、水文地质条件以及支护结构选型.根据工程特点将其分为4个典型工况,运用FLAC3D建立三维数值模型对基坑开挖的标准段进行数值模拟计算,旨在研究“钻孔灌注桩加内支撑”这一支护结构在兰州地区地铁车站深基坑工程施工中的变形规律并分析其水平位移、钢支撑轴力及其周围土体的沉降规律和沉降影响范围.根据支撑位置的不同及其对深基坑变形的影响,对该基坑工程的支护设计方案进行优化.与原方案对比,优化方案在控制变形等方面有一定的改善.
Relying on the deep foundation pit project of Century Avenue Station of Lanzhou Subway Line 1, the surrounding environment, hydrogeological conditions and supporting structure selection of the proposed site are introduced, which are divided into 4 Typical conditions, the use of FLAC3D to establish three-dimensional numerical model for excavation of the standard section of numerical simulation, aiming to study “bored pile plus support ” this support structure in Lanzhou metro station deep foundation pit The law of deformation during construction and the analysis of its horizontal displacement, the axial force of steel support and the settlement rule of surrounding soil and the influence range of settlement.According to the different support position and its influence on the deformation of deep foundation pit, Support design optimization program.Compared with the original program, the optimization program has some improvements in the control of deformation and so on.