9787564636616 - the interaction mechanism and engineering practice of shallow coal seam mining and fragile ecological protection(chinese edition) von fan gang wei , zhang dong sheng , wang xu feng , ma li qiang (1 Ergebnisse)

paperback. Zustand: New. Paperback. Pub Date: 2019-01-01 Pages: 191 Language: Chinese Publisher: China University of Mining and Technology Press. The main contents of this book include: characteristics of the geological conditions of the Shendong mining area and overview of the surface ecological environment. and the characteristics of overlying rock activities in conventional shallow coal seam mining And crack development law. evolution law of water retention performance of water-resistant layer mining and water ret.…