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英文原文
Classification of conditions for short-wall continuous mechanical mining in shallowly buried coal seam with thin bedrock
LIU Yu-de ZHANG Dong-sheng MA Li-qiang ZHAO Yong-feng
WANG Hong-sheng
School of Mines, China University of Mining Technology, Xuzhou, Jiangsu 221008, China
State Key Laboratory of Coal Resources Mine Safety, Xuzhou, Jiangsu 221008, China
Shendong Coal Filiale of Shen-Hua Energy Sources Co. Ltd., Ordos, Inner Mongolia 232001, China
Abstract:
The room and pillar method is usually used to extract coal from shallowly buried seams with thin bedrock. This results in a very low production efficiency and in a low degree of extraction. In recent years short-wall continuous mechanical mining has been extensively used in many situations except shallowly buried coal seams with thin bedrock. The principles governing movement of the overlying strata above the 2-2 coal seam were deduced from in-situ experience, laboratory data, calculations and computer simulations. The thicknesses of the bedrock in the Shendong Coal Field where the coal is shallowly buried are classified into 5 types: 10 m, 10–15 m, 15–25 m, 25–35 m and 35 m, which was done using fuzzy clustering results. A series of reasonable, relative parameters in each category have been calculated and analyzed. One proposed way to perform short-wall continuous mechanical mining in shallowly buried coal seams is given. This is significant for coal mines with similar geological conditions.
Key words: short-wall; continuous mining; thin bedrock; fuzzy clustering; technical parameter
1 Introduction
Shallowly buried coal seams are typically characterized by a single key stratum, a small thickness ratio of bedrock to load-layer and a thin overlying stratum under a thick gravel formation. The
relative parameters of a shallowly buried coal seam are: The buried depth of the coal seam is less than 150 m and the thickness ratio, Jz, of the bedrock to the load-layer is usually less than 1.0.
There
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