摘要
通过对三峡库区万州区几十处滑坡勘察、设计和施工资料的综合分析,进行了滑带土抗剪强度参数(粘聚力c 和内摩擦角?)的统计分析,利用χ2 检验法进行拟合,从而得出了c 和? 值的概率密度函数以及它们的概率分布形式:c 值服从对数正态分布,而? 值服从正态分布;以此为先验函数,利用Bayes 方法对万州区关塘口滑坡滑带土的小样本参数c 和? 值进行优化。计算结果表明,优化后方差和变异系数分别下降了37.6% 和32%,因而可以提高滑坡防治工程的可靠性,从而达到滑坡优化设计的目的。
This paper concludes the data of investigation, design, and construction for more than scores of landslides mitigation works in Wanzhou area of the second stage program of large geohazard control and prevention in Three Gorges Reservoir. Based on statistical analysis of shear strength parameters c and φ in sliding zone along horizontal-stratum landslides in Wanzhou area and the fitting of probability density function from x2 check method, it draws the conclusion that probability distribution form of cohesion c obeys the logarithm normal distribution, and angle of internal friction φ, normal distribution. The probability density function as prior function is used to optimize a little sample of c and φ of Guantangkou landslide in Wanzhou area through Bayes method, and the calculated results indicate that variance drops by 37.6% and coefficient of variation by 32%. In this way, the reliability of landslide control can be improved and optimization design will be realized.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第9期1588-1593,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
高校博士点基金资助项目(20030491004)
教育部科学技术研究重点项目(03034)
关键词
工程地质
抗剪强度参数
概率分布
概率密度函数
对数正态分布
正态分布
Engineering geology
Internal friction
Landslides
Normal distribution
Probability density function
Shear strength
Statistical methods
