采矿与安全工程学报2018，Vol.35Issue(1)：64-70,7.DOI:10.13545/j.cnki.jmse.2018.01.009
大倾角煤层长壁大采高工作面煤壁稳定性的采厚效应
Coal rib stability effect of mining-thickness with large mining height of working face in steeply inclined seams
摘要
Abstract
The coal rib spalling is one of main factors to limit the safe and high efficiency mining of an underground working face with a large mining height in a steeply inclined seam. In order to analyze impacts of mining height on the stability of coal rib, the comprehensive methodologies including nu-merical calculation, theoretical analysis, and in-situ monitoring have been applied to study distribution characteristics of stress and displacement of coal rib. The mechanical model of coal rib in vertical direc-tion has been established for revealing critical conditions on instability of coal rib and the mechanism of mining height on stability of coal rib was studied. The research results show that the vertical displace-ment of coal rib is much greater than the horizontal displacement. The horizontal displacement of coal rib in middle and lower areas is smaller than that in upper area and the vertical stress of coal rib in lower area is larger than that in upper and middle areas. With increasing mining height, the vertical stress of coal in front of working face increases continuously. The peak value and its distance from coal rib also increase. The vertical stress and displacement of coal wall decreases and the horizontal displacement of coal rib increases. The range of large horizontal displacement extends to deeper area and the probability of coal rib spalling increases.关键词
大倾角煤层/大采高工作面/煤壁片帮/采厚效应Key words
steeply inclined seam/great mining height working face/coal rib spalling/mining-thickness effect分类
矿业与冶金引用本文复制引用
王红伟,伍永平,解盘石,罗生虎,刘孔智,刘茂福..大倾角煤层长壁大采高工作面煤壁稳定性的采厚效应[J].采矿与安全工程学报,2018,35(1):64-70,7.基金项目
国家自然科学基金重点项目(51634007) （51634007）
陕西省自然科学基础研究计划项目(2016JQ5019) （2016JQ5019）
陕西省教育厅专项科学研究计划项目(2016JK1491) （2016JK1491）
