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结合上海某轨交建设工程实例,采用地层位移法,运用叠加原理和增量法,对紧贴既有轨交车站(地下连续墙共用)的深基坑开挖过程进行了二维和三维数值模拟。着重分析了深基坑开挖卸载作用下,既有车站结构的内力变化和变形趋势,对深基坑工程的施工提出了合理的控制要求。
Combined with an example of a railway construction project in Shanghai, two-dimensional and three-dimensional numerical simulation of deep foundation pit excavation process, which is close to the existing railway station (underground continuous wall), is carried out by using the formation displacement method and the superposition principle and incremental method simulation. Under the action of unloading excavation of deep foundation pit, the internal force variation and deformation trend of the existing station structures are emphatically analyzed, and reasonable control requirements are put forward for the construction of deep foundation pit works.