The air-driven down-hole hammer drilling is still very effective and speedy in well drilling in karst limestone area.

在水文水井中，气动潜孔锤钻进仍可发挥它高效率、高速度的作用。

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Taian city belongs to north limestone area, and is a place taking karst ground water as source of water supply mainly.

泰安地处北方石灰岩地区，是一个以岩溶地下水为主要供水水源的城市。

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The dam site of the GHP and the reservoir area is situated on the limestone area with a high karst degree.

高坝洲水利枢纽坝址与水库区石灰岩地层分布广，岩溶化程度很高。

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