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黄河冲积地层的土体软弱、稳定性差、基坑支护困难,施工风险高,极易诱发恶性工程事故。本文以济南省会文化艺术中心大厦深基坑为工程背景,采用现场监测数据分析、统计建模和FLAC3D数值模拟相结合的方法进行模型优化和辩识参数。以支护桩体水平位移为基坑变形稳定性评价指标,讨论了支护桩插入比、支护桩刚度、锚索预应力等因素对该指标的影响,进而提出了适合于济南市冲积层深基坑支护的合理参数。确保了济南省会文化艺术中心大厦深基坑施工的安全、优质;为同类地层深基坑支护提供了支护设计经验和参考。
The alluvial stratum of the Yellow River has weak soil, poor stability, difficult foundation pit support, high construction risk and easily induced malignant engineering accidents. In this paper, based on the deep foundation pit of Jinan Capital Arts Center Building, the model optimization and identification parameters are carried out by on-site monitoring data analysis, statistical modeling and FLAC3D numerical simulation. Taking the horizontal displacement of supporting piles as evaluation index of deformation stability of foundation pits, the influences of such factors as insertion ratio of supporting piles, stiffness of supporting piles and prestressing force of anchor cables on the index are discussed. Then, Reasonable parameters of deep foundation pit support. It ensures the safety and quality of deep foundation pit construction of Jinan Capital Arts Center Building. It provides support design experience and reference for deep foundation pit support of similar ground.