Coarse Sand Layer

The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand.

大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。

Both saturated-unsaturated flow drainage experiment without the fine sand layer on the top of the coarse sand and air-water two-phase flow drainage experiment with the fine sand layer were performed.

进行了粗砂上部没有细砂层的均质砂柱的饱和-非饱和流排水实验以及粗砂上部存在细砂层的水气二相流排水实验。

The foundation of the dam for Dalong reservoir consists of the layer of medium-coarse sand with gravel, so it is difficult to be penetrated even by the high-power vibrator.

大隆水库大坝坝基为含卵砾中粗砂层，即使大功率振冲器也难以贯入。