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。
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。
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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