煤炮是一种突出征兆。大用矿井从1967年6月3日突出以来,不论是瓦出、压出和倾出(除揭石门外),几乎都有一种明显的征兆——煤炮。在较长时间中,摸索到用掌握煤炮的不同声响,来判断突出的可能性,在当前监测手段不多的情况下,是一种简 Coal cannon is a prominent sign. Large coal mine has been prominent since June 3, 1967, whether it is watts, out and dumping (except the steeple door), almost all have a clear sign of - coal artillery. In a relatively long period of time, he explored the possibility of judging the prominence by knowing the different sounds of the coal cannon. In the current situation where there are not many means of monitoring, it is a simple