To control the problem of coal wall spalling in large mining height working faces subject to mining considering the Duanwang Mine 150505 fully mechanized working face the mechanism of coal wall spalling in working faces was investigated by theoretical analysis numerical simulation and field experiment Based on analysis of coal wall spalling in the working face a new grouting material was
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Get PriceAdvancing Coal Mining Technology Research Development and Demonstration in Fiscal Year 1977 National Technical Reports Library NTIS Home Help Details Actions Advancing Coal Mining Technology Research Development and Demonstration in Fiscal Year 1977 PB278001
Get PriceSoviets welcome advanced coal mining technology Full Record Related Research Abstract The coal production target for the Soviet Union for 1985 is 770 800 million tonnes In 1981 surface mining provided 38% of output this should increase to 40% by 1985 Soviet coal reserves are quoted as x 10/sup 12/ tons of which 90% are in the east
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