陷落柱 meaning in Chinese

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Distribution of subsided column in wangzhuang coal mine
王庄井田陷落柱分布规律分析
Preliminary discussion on origin and prevention of subsided column
陷落柱成因及预防初探
Synthetic prevention of buried subsided column of water flowing
隐伏导水陷落柱的综合防治
On karst collapse column and tactics of mine water prevention
岩溶陷落柱与矿井防治水策略研究
Explanation of coal mine subsided column with coherence technology
大同煤田陷落柱构造特征浅析

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