近距离煤层下行开采覆岩运移规律试验研究

Experimental Study on Overlying Strata Movement Law in Downward Mining of Close Distance Coal Seam

以新元煤矿地质条件为背景,采用相似材料模拟试验对该矿10煤、11煤开采过程中的覆岩运动规律及位移变化特征进行了系统研究。结果表明,下层煤开采会造成上层煤采空区上方相对稳定的岩层二次失稳垮落;两层煤依次开采过程中,均呈现出中部位移大、两边位移小的规律,且位移变化规律曲线形状也呈现出由"V"型转为"U"型。

Based on the geological conditions of Xinyuan Coal Mine,the movement law and displacement change characteristics of overburden in the mining process of 10 coal and 11 coal are systematically studied by using similar material simulation test.The results show that the mining of the lower coal will cause the relatively stable rock strata above the goaf of the upper coal to lose stability and collapse for the second time;during the mining process of the two coal seams in turn,they all show the law of large displacement in the middle and small displacement on both sides,and the curve shape of displacement change law also shows the change from"V"type to"U"type.