【摘要】 根据平朔安家岭2号井工矿B905试验工作面的具体条件,通过对目前常用三种放煤方式的放煤时间和回采率进行实测比较,决定采用双轮顺序放煤。同时为了提高生产效率,根据后部输送机运输能力,计算得出了工作面同时放煤口数,确定了平均分三组单口放煤的放煤循环方式,并对工作面顶煤放出率进行了实测分析。结果表明,该放煤循环方式取得了良好的生产效率,工作面回采率达到84.22%,比试验前单轮顺序放煤提高了7.22%,工作面最高月产达到118万t。更多还原

【Abstract】 According to the certain conditions of No.B905 trial coal mining face in pingshuo Anjialing No.2 mine,with the site measurement comparison between the coal caving time and mining recovery rate of the present common three top coal caving methods,a double round sequence top coal caving was applied.Meanwhile according to the conveying capacity of the rear face conveyor,the simultaneous top coal caving window numbers in the coal mining face were calculated and a top coal caving circulation method with three group windows caving in average was determined.A site measurement analysis was conducted on the top coal caving rate of the coal mining face.The results showed that a excellent production efficiency was obtained with the top coal caving circulation method,the mining rate of the coal mining face reached at 84.22% which was 7.22% higher than the single round sequence coal caving before the trial and the max month production of the coal mining face reached at 1.18 million t.更多还原