Tian Qu-zhen
Abstract
The article unifies Shangwan coal mine 1-2 coal,seam studied the caving characteristic of hard extra-thick coal,which provides certain theory basis to the research of caving character of top coal.
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The article unifies Shangwan coal mine 1-2 coal,seam studied the caving characteristic of hard extra-thick coal,which provides certain theory basis to the research of caving character of top coal.
Key concepts: Mining engineering, Coal mining, Geology, Coal, Engineering, Waste management