厚层灰岩顶板综采工作面初次放顶实践

Practice of First Caving Technology in Fully Mechanized Mining Face with Thick Limestone Roof

针对厚层灰岩顶板工作面初次来压步距大,易引起工作面顶板安全事故的问题,以神农煤业15101工作面为背景,在工作面切眼及两端头顺槽分别布置了爆破放顶钻孔和退锚爆破钻孔。通过矿压观测分析可知,1^#切眼初次来压步距平均为26.9m,工作面上下端头顶板能够及时垮落,悬顶面积不大,达到了弱化顶板的目的。

In view of the problem that the first step distance of thick limestone roof working face is large,which is easy to cause roof safety accident of working face,taking Shennong Coal Industry 15101 working face as the background,blasting caving drilling and anchor blasting drilling are arranged in the working face and the two ends along the groove respectively.Through the observation and analysis of mine pressure,it can be seen that the average initial pressure step distance of 1^#cut is 26.9m,the roof of the upper and lower ends of the working face can collapse in time,the area of the suspended roof is not large,and the purpose of weakening the roof is achieved.