摘要
为了提高近距离煤层同采下位厚煤层综放开采的顶煤采出率,在分析泉店煤矿地质条件基础上,采用PFC数值模拟软件优化分析了顶煤的放煤参数,确定采用0.6 m的放煤步距,上行放煤工艺方式。放煤实测结果表明:单架平均放煤时间为84 s;顶煤的破碎块度在10 cm以下,直接顶破碎块度在30 cm以下;放煤后未见矸石的放煤口占10.3%,矸石比例60%以下的放煤口占86.9%;综放工作面的平均采出率约80.41%,最高采出率为84.3%。
In order to improve the top coal recovery rate of contiguous seams and lower thick seam by simultaneous mining,based on analyzing geological condition of Quandian Coal Mine,the paper used PFC simulation software to analyse the parameters of top coal caving,and determined the drawing interval was 0. 6 m,and used uplink coal caving technique. The coal caving effect was measured,and observations results showed that average caving time of every support was 84 s,the size of the broken top coal was under 10 cm,the size of the broken immediate roof was under 30 cm. After top coal caving,10. 3% of the caving mouth didnt find gangue,and 86. 9% of the caving mouth controlled the proportion of gangue under 60%,average recovery rate of the working face was 80. 41%,and the highest mining rate was 84. 3%.
出处
《煤炭科学技术》
CAS
北大核心
2014年第4期23-26,共4页
Coal Science and Technology
基金
国家自然科学基金资助项目(50904063)
中央高校基本科研业务费专项基金资助项目(2010QNA32)
关键词
近距离厚煤层
综放开采
放煤工艺
煤矸比
contiguous thick seam
fully-mechanized caving mining
coal caving technique
proportion of coal and gangue
