红圈调蓄水池坝体排水反滤层设计

The Design of Inverted Layer for Water Drainage of Hongquan Reservoir Dam

反滤层设计是土石坝设计的重要组成部分,文章介绍了红圈调蓄水池工程概况,其采用四周围堤闭合成形,库区地层主要为砂质泥岩,选用坝型为碾压式均质土坝,坝体排水采用水平褥垫排水。通过对作为被保护土的防渗土料进行特征粒径分析和处理,按照滤土和排水的设计准则阐述了反滤料的设计步骤和设计过程,确定了各反滤层级配包络线,并结合库区砂砾石级配确定选用料场成品砂、砾石掺和制备反滤料,为同类工程坝体排水反滤层设计提供了一定的参考和借鉴。

The design of inverted layer is an important part of the design of earth-rock dam.This paper introduces the general situation of Hongquan reservoir engineering,which is formed by the closure of the surrounding embankment.The stratum of the reservoir area is mainly sandy mudstone.The dam type is compacted homogeneous earth dam,and the dam drainage adopts horizontal mattress drainage.Through the analysis and treatment of the characteristic particle size of the impervious soil materials as the protected soil,according to the design criteria of filter soil and drainage,the design steps and process of the inverted filter materials are expounded,and the envelope of each filter level are determined.Combined with the grading of sand and gravel in the reservoir area,the finished sand and gravel in the material yard are selected to prepare the inverted filter materials,which provides a certain reference for the design of the inverted layer for dam drainage of similar engineering.