近距离上保护层开采保护范围研究

通过对数值模拟研究平煤十一矿己二采区己14-15-22090工作面保护层开采的保护范围,在走向和倾向上分别布置两组钻孔测定保护层开采后被保护层的瓦斯参数,根据测压钻孔确定被保护层在理论保护线两侧瓦斯压力分布,通过瓦斯压力确定被保护层保护范围,并结合数值模拟和现场测试,确定保护范围为沿走向的卸压角为56°,沿倾向的卸压角为71.57°,保护层开采后,被保护层的透气性增大了18.44～171.39倍.

Study on the Protected Range of Upper Protective Coal Seam with closed Distance

Abstract:The most effctive and economical regional prevention measure against caol-gas outburst is protective coal seam exploition. The protective effect is determined through the numerical simulation methods after the F14-15—22090 working face mined. The gas parameteres of the coal seam protected are tested by two groups of borehole arranged respectively from the trend and tendency. The distributiones of gas pressure are determined on both sides of the line of theory of protection through the borehole measured pressure. From the numerical simulation and field test, the Pressure angle in the trend is 56°, and the Pressure angle in the tendency is 71.57°. The permeability coefficient is calculated by use of gas flow, and it is 18.44~171.39 times what it is before protective coal seam exploition.