近距离煤层刀柱采空区下长壁采场顶板结构稳定性研究

近距离煤层的上部煤层采用刀柱采煤法回采后,下部煤层采用长壁采煤法进行回采。对于近距离煤层,随着煤层间距离的减小,上下煤层间开采的相互影响加大。通过对上部煤层残留煤柱破坏特征的数值分析,并对下部煤层工作面顶板稳定性的研究,得出了下部煤层回采工作面顶板结构的稳定性特征。

Study on the Stability of Roof Structure of Long Wall Mining Filed Beneath the Mined Area with Pillar Mining Method in Close Multiple -seams

In the upper seam of close distance coal seams pillar mining method is utilized,and in the underneath seam prepared to be mined long wall mining method is utilized.As for very short distance coal seams,along with the distance of coal seam reduce,the interrelationship of the two coal seam mining is increased.After finite element numerical analysis on the collapse characters of the upper seam pillars,and study on the underneath seam roof stability,the conclusion of stability characters of the roof structure of underneath seam is drawn.