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回采工作面内采用的支护方法与坚固岩层下沉时显现的矿山压力不相适应是难冒落顶板的煤层矿山压力不好控制的主要原因。为了排除回采巷道内顶板下沉的不良后果,应保证支架具有能防止难冒落岩层移动的足够的阻力。要达到这个目的,第一,可以采用高阻力的支架;第二,可用缩小坚固岩层冒落步距的方法减少下沉过程的强度。在第二种情况下,在采煤工作面内要进行顶板岩层的松动,即采用先进的爆破方法和顶板进
The main reason for the poor control of pressure in coal mines without falling roof is the main reason that the supporting methods used in the mining face are not compatible with the mine pressure that appears when the strong rock subsidence sinks. In order to rule out the adverse consequences of the roof subsidence in the mining tunnel, it is to be ensured that the brackets have sufficient resistance to prevent the formation of difficult rock movements. To achieve this goal, firstly, high-resistance stents can be used. Second, the strength of the descending process can be reduced by means of reducing the step-down distance of the sturdy rock formation. In the second case, the roof strata should be loosened in the coal mining face using advanced blasting methods and roofing