砂砾料反滤设计述评

土石坝的坝体分区和覆盖层的可利用设计中，往往要求反滤层、过渡层和排水体等均要遵循“滤土”和“排水”的准则。事实上，这些分区的反滤设计离不开被保护料、保护料的材料特性，同时与渗流及渗流控制措施密切相关。借相关工程的反滤设计实践，在前人工作的基础上，系统地就反滤层的作用和型式、滤层准则及应用注意事项做些探讨和归纳，以供同行借鉴。

A view of design of sandy gravel filter

In the available design of zoning and overburden of the embankment,it is often required to obey the criteria of "soil filtering" and"drainage" for the filter,transition and drainage.In fact,the filter design in the zoning cannot be separated from the characteristics of protected materials,protective materials that have close relation with seepage and seepage control measures.Based upon filter design practice of relevant hydropower projects and the former work done by others,the discussion and summary are made on functions and types,filter criteria and considerations for reference.