The karst water-filling mines in Hunan province occur widely, which can be divided into two types. that is, karst water-filling mine and underground river conduit water-filling mine.

我省岩溶充水矿床较为广泛，可分为岩溶充水和暗河管道充水矿床两个类型，前者包括水文地质条件简单、中等和复杂三个亚类。

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Special geological conditions including karst cave, flow sand seam and underground river are encountered during construction of railway and highway engineering.

在公路铁路基础建设工程中，常会遇见溶洞、流砂层、地下暗河等特殊地质情况。

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