地基承载力经验公式的变异性分析

Analysis of variability of empirical formulas for foundation bearing capacities

应用随机场理论,研究了地基承载力表、CPT等地基承载力经验公式的变异性分析方法,提出经验公式确定地基承载力的变异性是由经验公式本身的不确定性和土性参数的不确定性组成,提出了考虑土性参数自相关性的地基承载力经验公式的变异性分析方法,通过对编制CPT确定地基承载力经验公式资料的计算分析,得出CPT确定地基承载力的变异系数在0.1～0.135之间.

Using random field theory, a method for analyzing variability of empirical formulas for foundation bearing capacity, such as foundation bearing capacity table and CPT, is studied. And it is pointed out that the variability of foundation bearing capacity is constituted by the variability of empirical formula oneself and variability of soil parameters. We put forward an analysis method of foundation bearing capacity variability determined by empirical formula with considering self-correlation properties of soil parameters. By the analysis and calculation of the data which workout the empirical formula, the variation coefficient is obtained, which is 0.1-0.135.