摘要
岩土参数分布区间的计算是可靠度分析方法中的一项基础性工作。在实际工程中,受采样数量的限制,岩土参数多为小样本。在探讨3σ法则、考虑偏度的分布区间修正法以及非参数Bootstrap法等现有的岩土小样本参数区间估计方法的适用情形及存在的不足的基础上,结合岩土工程参数区间估计的特点,提出了一种适用于小样本岩土参数区间估计的改进灰自助法。算例表明,在不同的参数分布情形及样本数量下,改进方法优于已有方法。
The calculation of the distribution range of geotechnical parameters is a fundamental work in reliability analysis method. In actual project, as the number of samples is limited, the geotechnical parameters are mostly small sample. By comparing existing geotechnical parameter interval estimation methods of small sample （30＂ laws, considering of skewness distribution range correction method and non-parametric Bootstrap method）, the application and the deficiencies of above three methods is discussed. By combining the characteristics of interval estimation of geotechnical parameters, an improved gray self- help method is proposed for interval estimation of geotechnieal parameters. The results show that the improved method is superior to existing method by comparing the distributions of different parameters and the number of samples.
作者
李化云
范洪海
胡端
LI Huayun FAN Honghai HU Duan(School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, Sichuan, China Key Laboratory of Green Building and Energy Saving, Xihua University, Chengdu 610039, Sichuan, China Chinese Harbour Engineering, Beijing 100027, China Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
出处
《水力发电》
北大核心
2017年第8期44-47,66,共5页
Water Power
基金
国家青年科学基金项目(51608450)
西华大学绿色建筑与节能重点实验室开放基金项目(szjj2015-075)
关键词
岩土工程
小样本
参数
区间估计
geotechnical engineering
small sample
parameter
interval estimation
