湖南利民矿井煤与瓦斯突出的构造差异性研究

湖南利民矿井地质构造具有明显的区域差异性,应力分区易于确定.由于主、次、附加构造应力场的联合与复合作用,导致边界条件各异.3#煤层顶底板的围岩性质不同,地质构造发育就不一样,使其构造应力分布不均.导致发育于3#煤层顶底板的断-褶构造具有平面上的分区性和剖面上的不协调性.据煤与瓦斯突出的频率和强度,厘定出强突出区、次强突出区、未突出区、弱突出区四种突出区域,分别对应于构造应力区的过度挤压区、挤压区、引张区和过渡区.地质构造的差异性是利民矿区煤与瓦斯突出强度和频率的主控因素.

Study on geostructure difference of coal and gas outburst in Limin coal mine, Hunan, China

Because of the apparent geostructure differences in different areas, it is easy to divide the zone of stress in Limin mine areas. Multiple effects of main, second, additional tectonic stresses result in the different BC (boundary conditions), the different characteristics of adjacent rocks in roof-floor of 3~# coal seam, the different development of geostructure, and different structure stresses in different places. Taking account all the facts above, there are differences in plane and unharmonics in cut section. According to the frequency and intensity of the of outburst coal and gas, four zones are collated, including intense outburst zone, secondary outburst zone, weak outburst zone, and non-outburst zone. They are correspondent with the over-press zone, press zone, conduct-spread zone, and transition zone. The difference of geostructure is the key factor of outburst intensity and frequency in the Limin mine area. The conclusion plays a very important role in dividing geostructures in the mine area and outburst place, and it can give a reference to the outbursts of coal and gas in similar coal mines.