不透水层 [地质] aquifuge ; [矿业] impervious bed ; impervious layer ; impermeable layer
土壤不透水层 watertight stratum
流]不透水层 impermeable barrier
不透水层百分比 Impervious Surfaces Percentage
不透水面层 [水利] impervious blanket
不透水地层 confining stratum ; impervious stratum ; impermeable stratum ; water-tight stratum
不透水粘土层 claypan ; impervious clay blanket
不透水垫层 Impervious blanket
不透水岩层 impermeable rock stratum ; impermeable rock bed
砂岩通常是良好的含水层，而细粒泥岩通常是不透水的。
Sandstones generally make good aquifers, while finer-grained mudstones are typically impermeable.
若已知存在不透水层，不透水层内的水压力分布规律如何。
If the water-tight stratum had already existed, what the groundwater pressure distribution regular in it.
在基坑底部以下存在承压水层的情况下，基坑开挖减少含水层上覆不透水层的厚度。
When confined aquifer under the bottom of the pit, the foundation excavation will reduce the thickness of overlying impermeable layer.
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