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难冒落顶板的周期下沉不仅给采煤作业带来很大困难,而且也会增加在缓倾斜煤层综采工作面内作业的危险性。 测定顶板下沉量(有悬顶倾向的)的方法多半是以地质资料的定性分析和生产工作面的仪器观测为依据的。最重要的是,在回采工作开始前,也就是说在开切巷道中安装综采机组之前,确定将要生产的工作面产生危险条件的可能性和这种综采机组的适用程度;制定和预先采取减少各种作业(例如,安装高阻力支架、用各种方法处理围岩、 培
The periodic sinking without falling roof not only brings great difficulties to the coal mining operation, but also increases the danger of working in the fully mechanized mining face of gently inclined coal seam. The method of determining the amount of roof subsidence (with a tendency of hanging overhead) is mostly based on the qualitative analysis of geological data and the instrumental observations on the production face. Most importantly, before the commencement of the mining work, that is to say before the fully mechanized mining unit is installed in the roadway, the possibility of creating hazardous conditions on the work surface to be produced and the suitability of this type of fully mechanized mining unit are established and prioritized To reduce the various operations (for example, the installation of high resistance bracket, a variety of ways to deal with rock,