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确定地基承载力的大小及变异特征是经济、安全地进行基础设计及可靠性分析的前提条件。基于静力触探数据,采用bootstrap方法对地基承载力的变异性进行了研究。首先,对某粉土地层的静力触探数据进行了统计分析;简要介绍了bootstrap方法的基本思想和过程;根据CPT数据确定的5个地基承载力特征值,采用bootstrap方法获得承载力均值与标准差的分布情况,确定其置信区间。Bootstrap方法为岩土参数标准值的确定提供了一种新的方法,研究结果为合理确定地基承载力大小及地基基础的可靠性分析提供了参数依据。
Determining the size and variation of foundation bearing capacity is a prerequisite for economical and safe foundation design and reliability analysis. Based on the static penetration data, the bootstrap method was used to study the variability of the bearing capacity of foundation. First of all, the statistic analysis of the static penetration data of a silt strata is made. The basic idea and process of the bootstrap method are briefly introduced. According to the eigenvalues of the five foundations of the foundation determined by the CPT data, the bootstrap method is used to obtain the mean value of the bearing capacity Standard deviation distribution, to determine the confidence interval. The Bootstrap method provides a new method for the determination of the standard value of rock and soil parameters. The results provide the basis for the reasonable determination of the bearing capacity of foundation and the reliability analysis of foundation.