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软土地区采用框架逆作法施工超大深基坑工程,立柱桩与土体、框架梁支撑与施工栈桥的相互作用,所引起的立柱差异沉降需严格控制。结合工程实例,采集立柱沉降数据,研究可视化分析方法,绘制直观精确的平面图和三维曲面模型,详细分析了立柱差异沉降的时空效应特征。分析结果表明,立柱沉降在空间和时间上存在不均匀性,基本呈现上浮趋势,单根立柱最大回弹量较小,而立柱间差异沉降较大。基坑中部立柱变形大于边界立柱,坑内土体隆起为主要影响因素,栈桥对立柱隆起具有明显的约束作用。最大差异沉降发生于底板浇筑之前,且位于栈桥与塔楼的临界位置,与土方开挖顺序密切相关。及时分析和反馈可视化信息,有利于指导信息化施工,控制立柱差异沉降。
In the soft soil area, the construction of the large deep foundation pit by the frame reverse construction method is adopted. The interaction between the column pile and the soil, the support of the frame beam and the construction trestle should be strictly controlled due to the differential settlement of the column. Combined with the engineering example, the data of column settlement are collected, the visual analysis method is researched, the plane diagram and the three-dimensional curved surface model are drawn accurately, and the characteristics of space-time effect of column differential settlement are analyzed in detail. The analysis results show that the settlement of columns is not uniform in space and time, and tends to float upward. The maximum springback of single column is smaller and the differential settlement between columns is larger. The deformation of the central column in the middle of the pit is larger than that of the boundary columns, and the uplift of the soil in the pit is the main factor, and the trestle has a significant restraint effect on the uplift of the column. The maximum differential settlement occurs before the floor pouring and is located at the critical position of the trestle and the tower, which is closely related to the earthmoving sequence. Timely analysis and feedback of visual information is conducive to guiding the construction of information, control the differential settlement of columns.