对中国《碾压式土石坝设计规范》(DL/T5395—2007)和欧洲岩土工程设计规范Eurocode7关于坝坡抗滑稳定分项系数设计方法进行了较为系统的比较.着重比较了分项系数设计法的分项系数取值、参数特征值取值以及抗滑稳定计算方法三方面.通过一个土石坝算例研究了中国与欧洲规范关于分项系数设计方法在土石坝抗滑稳定分析中的应用,并从相当安全系数和失效概率两方面对两规范安全度水平进行了对比.由算例分析可以看出基于概率极限状态设计原则的分项系数设计方法可以更好地考虑设计参数的不确定性.欧洲规范设计的土石坝抗滑稳定失效概率明显大于中国规范设计的土石坝抗滑稳定失效概率.基于Eurocode7推荐的Schneider方法和中国规范规定的小值平均值确定的特征值计算的失效概率略大于采用参数均值计算的失效概率.
A comparative investigation is conducted on the partial safety factor design methods (PSFDM) for embankment dam anti-slide stability between Chinese code Design specification for rolled earth-rock fill darns (DL/T 5395-2007) and Eurocode 7. The comparison is mainly focused on the partial safety fac- tors, characteristic values, and anti-slide stability analysis methods. An example of embankment dam is presented to study the application of the PSFDMs in the embankment dam anti-slide stability analysis, and compare these two codes' safety levels from both the factor of safety and probability of failure. The exam- ple results indicate that the probabilistic limit state design method can account for the parameter uncertain- ties properly. The probabilities of failure for dam anti-slide stability calculated from Eurocode 7 are signifi- cantly larger than those calculated from Chinese code. The probabilities of failure obtained from the char- acteristic value based on the Schneider method and the small mean value recommended by Eurocode 7 and Chinese code, respectively, are slightly larger than those obtained from the corresponding mean values.