可靠度在反滤层设计中的应用

Reliability Application in the Design of Filter Layer

本文对无粘土的反滤保护的可靠度进行了系统的探讨。首先从力学和结构角度分析了土体结构特征及破坏机理，得到过地理论下的极限状态方程。然后研究代表土体质点的单元体合理线性长度计算方法及其稳定程度。通过对均质体随机性的考察，得出无粘性土特征粒径分布规律及分布特征值。最后，应用概率论，给出了单元体反滤保护和反滤层整体反滤保护失效率和可靠度的计算方法，及西北口堆石坝的垫层反滤保护的失效率和可靠度。

Structure features and failure mechanism of soil were analyzed,equation for limiting statebased on the filter theory was abtained. Method for calculating the reasonable linear length of the ele-ment which represents the particle of soil and its stability were discussed.Through the investigation onthe randomness of homogeneous soil,the probability distribution of characteristic particle of cohesion-less soil and its characteristic values were obtained. calculation method of reliabilty and specific acci-dent on the element filter and enfire filter protecting soil were given. Reliability and specific accident ofthe filter(transition layer)proctecting the soil cushion course of the concrete face in Xibeikou CFRDwere illustraled.