不同采高上保护层开采卸压效应的UDEC数值模拟研究

利用UDEC软件对不同采高上保护层开采卸压效应进行了数值模拟,得到了在不同采高的上保护层开采时,被保护层在开采过程中的应力和位移变化规律,结果表明：上保护层开采后,采空区下部的被保护层垂直应力随着采高的增加而减小,垂直位移随着采高的增加而升高.为预防煤与瓦斯突出,优化卸压瓦斯抽采系统,提高卸压瓦斯抽采浓度、抽采量以及抽采率提供了一定理论依据.

UDEC numerical simulation study of pressure relief effects of protective layer mining in different mining height

Numerical simulation was conducted by using UDEC for the pressure relief effects of protective layer mining in different mining height. The variational law of stress and displacement were gotten. The results show that, after mined the upper protective layer, the vertical stress of protected layer under the gob decreases with increase of mining height, but the vertical displacement of protected layer under the coal pillar increases. This research provide some theoretical basis on the prevention of gas outburst, the drainage system of pressure relief gas is optimized, drainage concentration, volume and rate of pressure relief gas are improved.