中文摘要：

本文在分别考察被保护土和反滤料颗粒组成以及经验计算公式中主要参数随机特征的基础上，根据太沙基的反滤设计原则，给出了同时满足滤土和减压要求的反滤层设计的可靠性表述，建立了相应的实用计算公式。算例计算表明，可靠性分析方法的运用有利于反滤层的优化设计。优化选择反滤料特征粒径的均值和提高试验精度以控制各随机量的变异性，将能大大降低反滤层失效的风险率。

英文摘要：

Based on the investigation on composition of soil and material of reverse filter as well as the stochastic characteristics of the main factors in empirical formulas, the expressions of reliability satisfying the design of reverse filter material are suggested according to the filter design principle given by Jerzahi. The corresponding practical equations are also established. The application example shows that the method of reliability analysis is of help to optimization of reverse filter design. The optimization of mean characteristic gain of reverse filter material and controlling the variability of various stochastic factors by improving the test precision will greatly reduce the risk ratio of reverse filter failure.