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邻近江河深基坑由于受地下水渗流及潮位变化的影响,相关的设计与计算方法更加复杂。采用FLAC3D对某紧邻黄浦江的狭长形超长深基坑进行三维数值模拟,探讨基坑分区开挖、坑内地基加固、坑外潮位变化等施工条件对基坑变形及受力的影响,并与实测数据进行对比分析。结果表明,计算模型能够较好地预测不同施工条件下基坑的变形性状;平均潮位下基坑支护结构处于对称平衡受力状态,对维持基坑的整体稳定有利;不同分区间的封堵墙对基坑长边围护墙侧向变形的控制效果不明显;潮位对临江侧基坑围护墙侧向变形的影响较大,低潮位时墙顶会向坑外变形,并影响第1道支撑的受力,潮位变化较大的临江深基坑第1道支撑应采用与墙体整体现浇的钢筋混凝土支撑。
Due to the influence of groundwater seepage and tide level change, the related design and calculation methods are more complicated. FLAC3D is used to simulate a long and narrow deep foundation pit adjacent to the Huangpu River. The effects of excavation conditions such as excavation in the foundation pit, foundation reinforcement in the pit, variation in tide level outside the pit and so on on the deformation and stress of the foundation pit are discussed. Measured data for comparative analysis. The results show that the calculation model can predict the deformation of the foundation pit well under different construction conditions. The foundation pit supporting structure under the average tide level is in the state of symmetrical balance stress, which is beneficial to maintaining the overall stability of the foundation pit. The effect of wall on the lateral deformation of longwall retaining wall is not obvious. The tide position has a great influence on the lateral deformation of the retaining wall in the lateral foundation pit of the lower reaches of the foundation pit, 1 support the force, the tide level changes greatly Linjiang deep foundation pit 1 support should be used with the wall as a whole cast-in-place reinforced concrete support.