Loose covering layer that consisted of water containing fine powder sand layer was encountered in the overcasting at Zhaodianzi Iron Mine.
赵店子铁矿在露天开采中遇到了含有含水粉细沙层的松散覆盖层。
Water transportation and sand movement characters in the shaft double layer culvert are studied in this article.
试验研究了废黄河竖井双层涵洞输送水流和泥沙运动特性。
The changing features of the soil water in the lowland around by sand dune are: the frequent changing layer, the potential supplying layer and the relatively stable layer.
丘间低地土壤水分变化特征表现为：水分变化频繁活动层，水分潜在供应层，水分相对稳定层。
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