黄河冲积地层深基坑支护优化及应用研究

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FLAC^3D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。

Research on Supporting Optimization and Applications of Deep Foundation Pit in the Yellow River Alluvial Formation

Because of soft soil, poor stability and the difficulty of foundation pit supporting in the Yellow River alluvial formation, the construction work has high risk and easily induces malignant engineering accidents. Taking the deep foundation pit of the provincial capital culture and art center as engineering background, a model was established on the basis of the site monitoring data analysis and statistics, with combining FLAC^3D numerical simulation for model optimization and identification parameters. The effect of insertion ratio of retaining pile, the rigidity of the retaining structure and the anchor cable prestress on the deformation is discussed according to the evaluation index based on pile horizontal displacement. Then reasonable parameters for deep foundation pit supporting in Jinan city alluvium are put forward. It ensures that the deep foundation pit construction in the Provincial Capital Culture and Art Center is safe and of high quality, and provides supporting design experience and reference for the similar formation deep foundation pit supporting.