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软土地区深基坑开挖具有明显的空间效应,对于基坑群,不同的基坑开挖次序引起的地层位移及周边建筑结构响应较为不同。上海地铁12号线龙漕路车站基坑位于运营轨道交通3号线高架正下方,面临紧邻高架桥墩施工的环境,更为严峻的是位于基坑中间的桥墩将处于桩基全周卸载的局面,分析桥墩周围不同的卸载次序以寻求对桥墩及桩基最小扰动的基坑开挖方案非常必要。运用FLAC3D数值模拟软件,建立地上地下整体模型,考虑降水工况,流固耦合分析不同的三种基坑开挖次序对3号线高架的影响,综合分析得出了最佳的开挖次序,为施工方案的制定提供参考。
Deep foundation pit excavation in soft soil area has obvious spatial effect. For the foundation pit group, the displacement of the ground due to different excavation sequence and the response of surrounding structures are quite different. The foundation pit of Longcao Road Station on Line 12 of Shanghai Metro is located directly under the Elevation of Operation Rail Transit Line 3 and faces the construction environment immediately adjacent to the viaduct pier. What is more serious is that the pier located in the middle of the foundation pit will be unloaded in the whole week of the pile foundation , It is necessary to analyze the different unloading sequence around the piers in order to find the excavation scheme of the foundation pit with the minimum disturbance to piers and piles. The FLAC3D numerical simulation software is used to establish the aboveground and underground overall model. Considering the influence of precipitation conditions and fluid-structure interaction analysis on the impact of No.3 excavation sequence on No.3 overhead line, the optimal excavation sequence is obtained through comprehensive analysis. For the construction plan to provide a reference.