铁道科学与工程学报2017，Vol.14Issue(4)：697-704,8.
边坡稳定分析中岩土参数置信水平取值探讨
Value of confidence level for geotechnical parameters in slope stability analysis
摘要
Abstract
Code for investigation of geotechnical engineering uniformly adopts 95% assurance unilateral confidence lower limit value as indicators of soil strength standard values, which can compensate the security risks of small sample sampling. But it may cause interference estimation when larger variability. Based on the small, medium and large variation of the overall strength parameters with respect to the same level of mean, and adopting multi-batches small sample random sampling method with fixed capacity, the distribution space of standardc andφ corresponding to different reliability was constructed. The distribution characteristic of mapping soil slope safety factor results was analyzed, and the internal relations of the variability level and assurance rate under the principle of equal safety factor were discussed. Study shows that the dispersion degree of safety factor are positively correlated with the variability level and assurance rate, and the parameters of the unified 95% confidence level will lead to low estimated safety to larger variability of soil slope; With control condition of same safety factor, the advice for reducing the confidence level for larger variability of soil is proposed.关键词
岩土参数/小样本/置信水平/变异性/边坡稳定Key words
geotechnical parameters/small sample/confidence level/variability/stability of slope分类
交通工程引用本文复制引用
张文生,罗强,蒋良潍,骆飞,赵晶,李昂..边坡稳定分析中岩土参数置信水平取值探讨[J].铁道科学与工程学报,2017,14(4):697-704,8.基金项目
国家重点基础研究发展规划(973计划)项目(2013CB036204) （973计划）
