摘要
为提高平朔井工一矿放顶煤的放出率,在椭球体放煤理论的基础上,推导了可放椭球体、实放椭球体方程以及松动椭球体之间的相互关系;根据该关系计算了4106工作面在不同顶煤厚度和放煤步距时的顶煤放出率,计算结果表明:当顶煤厚小于4 m时,其最佳放煤步距为0.8 m,当顶煤厚为4~7 m时,其最佳放煤步距为1.6 m,当顶煤厚大于7 m时,其最佳放煤步距应为2.4 m;从而提出了不同顶煤厚度应采用的最佳放煤步距,提高了井工一矿综放工作面顶煤放出率。
In order to improve the top coal mining recovery rate of the fully-mechanized top coal caving mining face in No. 1 Underground Mine of Pingshuo,based on the ellipsoid caving theory,the possible caving ellipsoid and practical caving ellipsoid condition equations and the relationship between the condition equations and the loosened ellipsoid were deduced. Based on the coal caving step distance,a top coal caving technology was provided with the dynamic variation of the top coal thickness. The different top coal thickness of No. 4106 fully-mechanized top coal caving mining face and the top coal caving recovery rate under the different caving step distance were calculated individually. The results showed that when the top coal thickness was less than 4 m,the best top coal caving step distance was 0. 8 m. When the top coal thickness was ranging from 4 ~ 7 m,the best top coal caving step distance was 1. 6 m. When the top coal thickness was over 7m,the best caving step distance was 2. 4 m. The study achievements were promoted and applied to other coal mining faces in No. 1 Underground Mine and the top coal mining recovery rate of the fully-mechanized top coal caving mining face was obviously improved.
出处
《煤炭科学技术》
CAS
北大核心
2015年第5期51-53 143,143,共4页
Coal Science and Technology
关键词
放顶煤
椭球体理论
放煤步距
顶煤放出率
top coal caving
ellipsoid theory
coal caving step distance
top coal caving recovery rate
