煤矿安全2024，Vol.55Issue(9)：118-127,10.DOI:10.13347/j.cnki.mkaq.20231625
煤厚变化区围岩能量积聚规律及开采方向对其影响
Energy accumulation law of surrounding rock in coal thickness variation area and the influence of mining direction on it
摘要
Abstract
To reveal the energy accumulation law of surrounding rock in coal thickness change area and the influence of mining dir-ection on it,this study takes the 17#coal seam of Hegang Junde Coal Mine as the research background,and takes the combined rock strata as the object to discuss the stress transfer mechanism of coal thickness change area.The relationship between the original rock stress and the thickness ratio and elastic modulus ratio of coal rock in the coal thickness change area is revealed,and the influence of mining direction on the mining stress and energy accumulation law in the coal thickness change area is clarified.The following con-clusions are obtained:due to the difference in strength(stiffness)between rock and coal,the principal stress distribution in the coal thickness change area is uneven.The peak stress appears in the coal thickness thinning area,and the valley stress appears in the thickening area.The larger the range of coal thickness change and the smaller the elastic modulus ratio of coal and rock,the greater the peak stress and the smaller the valley stress.Under the influence of mining stress,the advance abutment pressure and the abnor-mal stress of coal thickness change are superimposed in the area of coal thickness change,and the stress concentration of surround-ing rock is high.From thin to thick mining,there is an impact danger zone due to the superposition of the advance abutment pressure zone and the stress anomaly zone in front of the working face,and there are two impact danger zones from thick to thin mining,so it is more reasonable to mine from thin to thick.In view of the mining stress and energy accumulation law in the coal thickness change area,the prevention and control ideas of regulating the surrounding rock structure,surrounding rock stress,and increasing impact resistance energy are put forward,the engineering application is carried out,and the application effect is good.关键词
冲击地压/煤厚变化/采动应力/能量积聚/开采方向Key words
rock burst/coal thickness change/mining stress/energy accumulation/mining direction分类
矿业与冶金引用本文复制引用
张国华,李子波,李豫波,秦涛,柳杨,荆珂,李佳臻..煤厚变化区围岩能量积聚规律及开采方向对其影响[J].煤矿安全,2024,55(9):118-127,10.基金项目
国家自然科学基金资助项目(51774122) （51774122）
