Reasonable Scope of Kilometer Drilling in Lower Layer of Extrathick Coal Seam: A Case Study of Tingnan Coal Mine, China
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DOI: 10.1155/2021/2044717
Abstract: When stratified mining is adopted in high-gas and extrathick coal seam, a large amount of pressure-relief gas of the lower layer flows into the upper layer goaf along the cracks in the layer, resulting in… read more here.
Keywords: lower layer; layer; gas; extrathick coal ... See more keywords