摘要
为研究散体顶煤在顶煤垮落角(未破碎顶煤)影响下的放出规律,借助离散元软件,将破碎后的顶煤简化为六边形不规则块体,分别研究了顶煤在不同垮落角下的放出规律。结果表明,当顶煤垮落角θ≤75°时,顶煤放出率随θ增大而增加,随后在θ=90°时迅速减少,而后随θ增大逐渐增加。顶煤放出率在θ=75°时达到最大为81.0%,在θ=60°及θ=90°时最小为70%。针对不同顶煤垮落角,放煤工艺的优化应综合考虑煤矸分界面与放出体形态及其位置关系,综合控制不同放煤阶段的放煤量与含矸率。
In order to study the drawing law of broken top-coal under the influence of caving angle(unbroken top-coal),the broken top coal is simplified to hexagonal irregular block using discrete element method, and the drawing law of top-coal under different caving angle is studied respectively.The results show that when the caving angle of top coal is less than 75°,the top coal recovery rate increases with the increase of caving angle, then decreases rapidly when caving angle is 90°,and then increases gradually with the increase of the caving angle.The top coal recovery rate reaches a maximum of 81.0% when caving angle is 75°,and a minimum of 70% when caving angle is 60° and 90°.For different top coal caving angles, the relationship between the coal-gangue interface and the shape and position of the drawing body should be comprehensively considered to optimize the coal drawing process, and comprehensively control the coal drawing amount and gangue ratio at different drawing stages.
作者
杨大鹏
李新源
郭宇
潘卫东
吴仁伦
ANG Da-peng;LI Xin-yuan;GUO Yu;PAN Wei-dong;WU Ren-lun(School of Energy and Mining Engineering,China University of Mining and Technology,Beijing 100083,China)
出处
《煤炭工程》
北大核心
2021年第9期83-88,共6页
Coal Engineering
基金
国家大学生创新训练项目(202111022)。
关键词
综放开采
顶煤垮落角
煤矸分界面
放出体
fully mechanized top-coal caving
top-coal caving angle
coal-gangue interface
drawing body
