坚硬顶板工作面高抽巷层位布置优化试验研究

Optimal Study on Horizon Position of High Level Gas Drainage Gateway in Hard Roof Mining Face

针对山西正邦煤矿综放工作面上隅角瓦斯超限和采空区煤层自燃问题,从瓦斯治理、自然发火和瓦斯流场等方面对该矿高抽巷层位合理位置进行分析论证,确定高抽巷层位布置在K2灰岩底板,不仅可以减少灰岩对于瓦斯运移的阻止作用,而且最大程度发挥了高抽巷抽采效果,并且保证采空区内横三带的稳定性,有效地防止了采空区自燃。高抽巷层位优化结果的可靠性得到现场实测数据的验证。

To solve the problems of gas overrun at the upper corner in full mechanized mining face and spontaneous combustion in the goaf of Zhengbang Coal Mine,the horizon position of high level gas drainage gateway was analyzed from the views of gas controlling,spontaneous combustion and gas flow field. It was found that the best horizon position of high level gas drainage gateway was K2 limestone floor,which could not only reduce stopping effect of gas transportation by limestone,but also exert a better extraction effect of high level gas drainage gateway. Furthermore,this floor could ensure the stability of the three-horizontal zones in the goaf,and effectively prevent its spontaneous combustion. The optimized horizon position of high level gas drainage gateway was verified by measured data.