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宝钢1 880 mm热轧漩流池基坑是迄今为止上海地区和国内冶金行业开挖最深的自立无侧向支护圆形基坑。该漩流池采用深-53.0 m地下连续墙围护结构,内外深井卸压降水(-36.0 m以下)干封底,基坑下有两层承压水且隔水层薄,降水工程风险控制难度大。一旦降水目标不能实现,将可能引起漩流池承压含水层突涌,漩流池基坑底部土层破坏,不仅可能造成漩流池结构本体失效,甚至对该区域已完建结构的安全带来巨大影响。在分析、识别漩流池降水工程实施风险的基础上,系统总结了漩流池降水工程风险综合控制的成功经验,对类似超深基坑降水工程的设计和施工组织有较好的参考价值。
Baosteel’s 1 880 mm hot-rolled swirling-fluid pool foundation pit is the deepest self-supporting non-laterally-supported circular excavation in Shanghai and domestic metallurgical industries to date. The vortex flow basin adopts a deep-53.0 m underground continuous-wall retaining structure, and the internal and external deep wells relieve pressure and precipitation (below -36.0 m) dry backing, there are two layers of confined water below the foundation pit and the water barrier is thin, so the risk control of precipitation engineering is difficult. Big. Once the precipitation target cannot be achieved, it may cause the inrush of the aquifer confined by the turbulent flow pool, and the destruction of the soil layer at the bottom of the turbulent flow basin foundation pit may not only cause the structural failure of the turbulence flow basin body, but also even the completed structure of the zone. Great influence. On the basis of analyzing and identifying the implementation risk of the vortex flow pool precipitation project, the successful experience of the comprehensive risk control of the vortex flow pool precipitation project is systematically summarized, which has a good reference value for the design and construction organization of the similar deep foundation pit dewatering project.