袁湾水库工程土坝段反滤层设计

Filter Layer Design of Earth Dam Section of Yuanwan Reservoir Project

袁湾水库土坝段代表坝型为土质防渗体分区坝,通过对作为被保护土的防渗土料和坝壳砂料各特征粒径分析和处理,按照滤土和排水的设计准则,叙述了反滤料的设计步骤和过程,确定了各反滤层级配包络线,并通过反滤料与天然砂料、采购碎石料粒径级配分析和对比,提出了利用天然砂料作为防渗土料反滤料的评价和坝壳砂料反滤层后层间关系设计,为同类工程反滤层设计提供了一定的参考和借鉴。

The representative dam type of Yuanwan Reservoir earth dam section is partition dam with soil impervious core.Through the analysis and treatment of the characteristic particle sizes of impervious soil material and dam shell sand material as protected soil,according to the design criteria of soil filtration and drainage, the design steps and process of filter material are described. The envelope of each filter level is determined.Through the analysis and comparison of particle size gradation between filter material,natural sand material and purchased crushed stone material, the evaluation of using natural sand as anti-seepage material is put forward. The design of the relationship after dam shell sand filter provides a certain reference for the design of filter layer in similar projects.