<正> The currently applied methodology of absolute gassiness forecasting in roadways being driven in Polish hard coal mines is based on the results of investiga
This paper describes the state-of-the-art and outlook of coal mining and clean coal echnology in China. As the major mining method,underground mining accounts f
The architectural patterns of sedimentary succession are diverse in different depositionalbasins. The sedimentary architecture and geological condition of such
The paper analyses quantitatively the anchoring effect of tensioned bolts on surrounding rock strength, and defines two concepts: one is the surrounding rock st