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为西安城区黄土冲洪积层CFG桩复合地基设计和施工更加合理。搜集了西安城区冲洪积地层信息,得到含有黄土层的3种阶地。假设各随机变量之间相互独立,基于3种阶地的6个典型复合地基工程中36根CFG桩的工程信息,建立CFG桩复合地基承载力无量纲极限状态方程,得到各随机变量的分布概率模型,利用Monte-Carlo法计算CFG桩可靠度指标,得到可靠度指标β平均值为3.033 6,低于《建筑结构可靠度设计统一标准》(GB 50068-2001)给出的柔性结构上部平均可靠度指标3.2.结果表明:利用经验公式进行CFG桩复合地基承载力的设计能够满足工程的可靠度要求。研究成果可为西安城区黄土冲洪积层CFG桩复合地基及类似工程的设计和施工提供依据。
It is more reasonable for the design and construction of CFG pile composite foundation of loess reclamation in Xi’an urban area. Collecting information of alluvial strata in Xi’an urban area and obtaining three kinds of terraces containing loess layers. Based on the engineering information of 36 CFG piles in 6 typical composite foundation projects in 3 terraces, the non-dimensional limit state equation of bearing capacity of CFG pile composite foundation is established, and the distribution probability model of each random variable is obtained , The Monte Carlo method was used to calculate the reliability index of CFG pile, the average value of reliability index β was 3.033 6, which was lower than the average upper reliability of the flexible structure given in “Unified Design Standard for Reliability of Building Structure” (GB 50068-2001) Indicator 3.2. The results show that the design of bearing capacity of CFG pile composite foundation by using empirical formula can meet the reliability requirements of the project. The research results can provide the basis for the design and construction of loess stratum-buildup CFG pile composite foundation and similar projects in Xi’an urban area.