论文部分内容阅读
极松软厚煤层采用放顶煤开采时,煤壁极易出现片帮、漏煤与冒顶现象,因此不得不降低工作面采高,造成有效通风断面减少和风速超标,工人作业环境恶化[1-3]。采高越低,丢煤越多,既降低了资源回收率,又增大了工作面发火倾向,而采用其他开采方法效率极低。因此,如何实现极软厚煤层安全高效开采,具有重要的现实意义[4-5]。1矿井概况及首采面地质条件芦岭煤矿主采煤层为8、9、10号煤层,8、9号煤层间距为0~5.0 m,平均为2.5 m,由浅至深8、9号煤层逐渐出现合并现象。8、9号煤层均为极松软
Very soft and thick coal seam when using caving mining, the coal wall is prone to patch, coal leakage and roof collapse, so had to reduce face mining, resulting in reduced effective ventilation section and the wind speed exceeds the deteriorating work environment for workers [1- 3]. The lower the mining height, the more coal is thrown away, which not only reduces the resource recovery rate but also increases the tendency of the working surface to ignite. However, the efficiency of other mining methods is extremely low. Therefore, how to realize the safe and efficient mining of ultra-soft thick coal seam has the important practical significance [4-5]. 1 Mine Overview and the First Mining Face Geological Conditions The main mining seam of Luling Mine is No. 8, No. 9 and No. 10 coal seam with the interval of No. 8 and No. 9 being 0 ~ 5.0 m with an average of 2.5 m, ranging from shallow to deep No. 8 and No. 9 coal seam Gradual merger. 8,9 seam are extremely soft