摘要
Abstract
In order to study the evolution characteristics of overburden rock fissures in deep burial fully mechanized mining faces,taking the 11000 working face of Yunding Coal Mine as the research object,theoretical analysis,numerical simulation and other methods are adopted to study the overburden rock fissures evolution characteristics of overburden rock affected by coal seam mining during the coal seam stoping process under deep burial conditions.Key layer discrimination,Hooke's law and others are used to conduct theoretical analysis,clarify the position of key layers in overburden rock.The mechanism of coal seam roof fracture is analyzed,and the roof fracture criterion is given;Taking the 11000 working face as the engineering background,numerical simulations are conducted using 3DEC simulation software,the failure characteristics of overburden rock and the dynamic change characteristics of stress at different stoping distances are analyzed;According to the lithology of overburden rock,the height of the water conducting fissure zone and the height obtained from numerical simulations are calculated using empirical formulas.The two corresponded to verify the numerical simulations,and the obtained simulation heights are reliable.The research results further explain the laws of overburden rock failure and fissure evolution during mining process,provide reference bases for roof management and safe mining in coal mining.关键词
深埋/覆岩裂隙演化/数值模拟/导水裂隙带高度/应力拱Key words
deep burial/overburden rock fissure evolution/numerical simulation/height of water conducting fissure zone/stress arch分类
矿业与冶金
