2013•Journal of Heilongjiang Institute of Science and TechnologyRequires access
No.10 coal seam roof characteristics in Luling coal mine
Huaze Yang
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Abstract
This paper draws on borehole core data,offers estimates of sandstones occurring within 30 m from roof in the Luling coal mine No.10 seams and immediate roof thickness,and analyzes coal roof lithology and structural types according to hard rock percentage and immediate roof thickness / shear height ratio(Km).The result shows that the coal roof lithology of No.10 can be divided into three kinds of hard,medium and soft rock masses,accounting for about 50%,35%,15% of the mining area respectively;the coal roof structural types are divided into four kinds,such as the main roof cover type,the false roof and main roof,the immediate roof and main roof type and the false roof and immediate roofs;the engineering geological type of the roof are divided into three kinds: no periodic weighting roof,periodic weighting roof and strong periodic weighting roof,accounting for about 49%,50%,and 1% of the mining area respectively.The coal mine is blessed with a better geological condition and the study serves as a basis for developing layout methods and selecting roof supporting patterns for working faces.