老顶的周期性沉降是工作面煤壁片帮、煤层压缩和拉伸及其它现象发生的原因。但周期性压力显现对准备巷道的影响,过去实际上没有研究过。B.B.拉依斯基的研究工作是比较著名的。他发现煤层的压缩和顶底板下沉速度的变化与老顶岩层悬顶和垮落有联系。 为了阐明和研究准备巷道矿压显现的特 The periodic settlement of the roof is the cause of the coal face slab in the working face, the compression and stretching of coal seam and other phenomena. But cyclical pressure appears to be impacting the preparation of the roadway, which in the past has not actually been studied. B. B. Lajski’s research work is more famous. He found that the compression of the coal seam and the change of top and bottom subsidence rates are related to the overhang and collapse of the old roof strata. In order to clarify and study the preparation of roadway pressure show special