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.
在砂岩矿床的地浸试验和生产中，含矿含水层地下水承压水头很低时，地浸钻孔的开拓难度很大且工艺复杂。
During the test and production of in-situ leaching of sandstone deposit, it is very difficult and complicated to exploit boreholes when confined water head of ore-bearing acquifer is quite low.
含水层有三种形态，分别是上层滞水、潜水和承压水。
There are three types of aquifers: perched, unconfined, and confined.
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