The collapse of overburden layer and land surface due to underground mining is one kind of environmental hazards induced by human being.
采矿区覆岩及地表塌陷是涉及全球性人为环境灾害之一。
2
Through the research of high gas and multi-water-bursting hazards prevention techniques in Jiaozuo coal mine regions, the mining coal method of caving working face is found.
通过对焦作矿区高瓦斯多水害防治技术研究，找出适合该条件下的炮采放顶煤模式的采煤方法。
3
Among the fire hazards and explosion accidents occurred in industrial and mining enterprises, electric fire hazards and explosion accidents make up a large percentage.