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软土地区进行基坑工程施工,在采用相同的开挖空间参数(分层厚度、每步开挖宽度、分区长度等)前提下,采用不同的时间参数,对基坑变形影响较大。结论表明:控制基坑开挖放置时间和有撑暴露时间,不但对控制新车站基坑变形有效,而且对调整老车站结构变形状态和控制老车站结构的变形也非常有效。采用按限时原则的逆作法施工,新车站基坑东侧墙体变形可满足一级基坑变形控制要求,老车站结构的变形均较小。
In the construction of foundation pit in soft soil area, under the premise of using the same excavation space parameters (thickness of stratification, width of excavation per step, length of subarea, etc.), different time parameters have a great influence on the deformation of foundation pit. The conclusion shows that controlling the pit excavation placement time and brace stay exposure time is not only effective in controlling the deformation of foundation pit of the new station, but also effective in adjusting the deformation of the old station structure and controlling the deformation of the old station structure. Adopting the reverse construction method according to the principle of limited time, the deformation of the wall on the east side of the new station pit can meet the deformation control requirements of the first-stage foundation pit, and the deformation of the old station structure is small.