小浪底土石坝反滤设计

阐述了小浪底土石坝反滤设计的原则，方法和成果。设计中，根据大坝防渗体的结构特点设置了多种反滤。按各个部位反滤的工作条件和重要性，将反滤分为关键性反滤和非关键性反滤。对这两类不同性质的反滤采用了不同的设计原则和方法。对于关键性反滤着重强调在防渗体发生集中漏时应不致于产生渗透破坏而危及大坝安全，而对于非关键性反滤则根据不同情况进行适当简化。根据料场砂卵石级配特点和反滤设计要求，综合利用筛分料和轧制料改

Filter Design for the Xiaolangdi Earth-Rockfill Main Dam

he design principle, method and results of the filter of the Xiaolangdi Earth-Rock fill MainDam are described in this paper. Considering the structural characteristics of the impervious component of the dam, several types of filter are set up in the design. According to the working condition and the importance of filter at each location, filters are classified as key filter and non-key filter. Different design principle and method are used for different type of filter. For the key filter,concentrated seepage must not endanger the dam. For the non-key filter, simplification is made accordingly. Considering the gradation of the sand and gravel available and the requirement of filterdesign, both processed and rolled materials are used to improve the gradation and the quality ofthe filtering material. This meaure also reduces quantity of gravel mined.