短壁连续采煤法在浅埋薄煤层中开采条件分类外文文献翻译.docVIP

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. Th