坚硬顶煤弱化对放顶煤开采的影响  

Influence of Hard Top Coal Weakening on Caving Mining

作　　者：岳基伟 岳高伟[1,2] 曹汉生[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]河南理工大学土木工程学院,河南焦作454000

出　　处：《煤矿安全》2016年第8期49-52,共4页Safety in Coal Mines

基　　金：河南省科技攻关计划资助项目(142102310268);中国博士后科学基金资助项目(2013M531673);河南省瓦斯地质与瓦斯治理重点实验室开放课题资助项目(WS2012B01)

摘　　要：采用离散元方法,从试验和数值模拟获取煤体宏观-微观力学参数后,建立放顶煤开采模型,分析弱化前后顶煤的落放过程及落放形态特征。结果表明:煤体弱化极大减小了其宏观-微观力学参数,注水弱化或爆破弱化后坚硬顶煤颗粒的黏结力仅为未弱化时的63%和55%左右;注水或爆破顶煤放出量差别明显,注水或爆破弱化后顶煤放出率分别为82.6%和89.43%,而弱化前放出率仅有54.47%。In this paper,discrete element method is used to obtain macro and micro mechanical parameters of coal from experiment and numerical simulation.Hard top-coal caving mining model is established to analyze coal falling process and dropping shape before and after weakening.The research results show that macro and micro mechanical parameters are reduced greatly after weakening hard top-coal,and after water injection and blasting in hard top-coal,the bonding force of coal particles is only 63% and 55% of that before weakening.Water injection or blasting in hard top-coal weakens significantly the tension among the coal particles,and the released amount of top coal after weakening is much larger than that before weakening.After water injection weakening top coal,the top coal recovery rate reaches 82.6%,and after blasting weakening top coal,the top coal recovery rate reaches 89.43%,while the top coal recovery rate is only 54.47% without weakening measures.

关 键 词：离散元 坚硬顶煤 煤体弱化 力学参数 数值模拟 放顶煤 

分 类 号：TD823.49[矿业工程—煤矿开采]