摘要
在渗透稳定的可靠性分析中,确定渗透系数的概率分布非常必要。基于渗透系数概率分布构建了偏态分布模型,结合江垭碾压混凝土坝体的透水率试验数据及渗透系数和透水率的换算因子对渗透系数进行了随机性分析,并编制相应的FORTRAN程序,采用偏态分布概率密度函数拟合渗透系数的概率分布。结果表明,利用FORTRAN程序对渗透系数进行偏态分布拟合,能获得较理想的概率密度曲线;采用众数和综合标准差代替均值和均方差作为统计值,可使结果更合理、可靠。
The determination of permeability probability distribution is indispensable in reliability analysis of seepage stability. Based on the permeability probability distribution, a skewed model is proposed. Combining the experimental data of Jiangya roller compacted concrete dam （RCC） and the conversion factor between the permeability and the permeable rate, a randomness of the permeability is analyzed. In order to fit the permeability probability distribution, a probability density function of skewed distribution is presented. And a relevant FORTRAN program is developed. The results show that the probability density curves are ideal by using skewed distribution to fit permeability coefficient with FORTRAN program; instead of the mean and mean square deviation with the mode and comprehensive standard deviation as statistical values, the results may be more reasonable and reliable.
出处
《水电能源科学》
北大核心
2012年第8期53-55,73,共4页
Water Resources and Power
基金
国家自然科学基金资助项目(51079039
51009053)
关键词
碾压混凝土坝
渗透系数
偏态分布
概率密度曲线
众数
综合标准差
roller compacted concrete dam
permeability
skewed distribution
probability density curve
mode
comprehensive standard deviation
