摘要
土体参数具有明显的离散性,把土体参数作为独立或相关的随机变量模型进行可靠性研究有一定的局限性.将土性参数视为随机场模型,考虑参数自相关性,根据实测静力触探资料拟合了相关函数,求解了某边坡土体的相关距离,将点方差转化为空间均值方差,按JC法计算了某边坡稳定可靠度指标.结果表明,将按随机场模型计算的可靠度指标要大于按独立或相关随机变量计算的结果,土体客观上存在自相关性,因此按随机场模型计算的可靠度指标更符合实际情况.
Soil property is obviously discrete; it is limited to study reliability considering soil property as independent or interrelated random variable model. Random field model of soil property and self-correlation have been accounted; according to the results of static cone penetration test, relational function has been fitted; the self-correlation distance is estimated; the point variance has been transformed into three-dimensional mean one; then reliability index on stability analysis of a slope is calculated by JC method. Result shows that the index calculated based on random field model is higher than that calculated based on independent or interrelated random variable model. Self-correlation on soil exists objectively; so the former is more consistent with to practice.
出处
《三峡大学学报（自然科学版）》
CAS
2009年第5期37-41,共5页
Journal of China Three Gorges University：Natural Sciences
基金
南京水利科学研究院青年基金(Y40805)
关键词
随机场
可靠性
边坡
稳定性
random field
reliability
slope
stability
