上保护层开采后的煤层群应力变化研究

摘要

This paper analyzes the FLAC3D model of coal and gas outburst well of one Guizhou mine. Along the strike direction, the stress of the middle part is decreasing, and the stress of open-off cut and incorporated line is increasing;along the strike direction, when the excavation to 100m and 150m, the relief scope of coal layer is the largest, and when to the 200m, the relief scope is decreased. The study of the coal seam group stress changes after mining the upper protective layer can better determine the scope of the protective layer.%对贵州某煤与瓦斯突出矿井建立FLAC3D模型进行分析，沿走向在中间部分的应力减小，在开切眼和收作线的应力增大；沿走向方向，煤层开挖到100m和150m的时候煤层的卸压范围最大，开挖200m时候卸压区范围有所减小。通过对上保护层开采后的煤层群应力变化进行研究，可以更好的确定保护层保护范围。