Based on the geological data of Qianqiu coal mine in Yima,the paper built a numerical model of the caving face under the thick conglomerate layer using the software UDEC to study the overlying strata movement characteristics. The numerical simulation shows that: as the increasing of mining area, the thick conglomerate layer gradually bended, then, the overlying strata yielded and the distance between the thick conglomerate layer and lower strata increased. After a certain distance, the strata on the left of caving face sink intensely,and the plastic areas of lower layers were destructed. If the caving face continues to advance, the thick conglomerate layer may break,which could cause rock burst.%基于义马矿区千秋煤矿工作面的采矿地质条件,采用离散元分析软件UDEC,建立了巨厚砾岩工作面覆岩移动的数值模型,模拟研究了上覆巨厚砾岩层的位移变化、塑性区分布和应力分布规律,结果表明:随着工作面的推进,砾岩层逐渐弯曲变形,接着上覆岩层总体均发生屈服,巨厚砾岩层与下方的岩层离层加大,到达一定距离后工作面左侧的岩层弯曲下沉强烈,岩层底部塑性屈服区域发生破坏,如果继续开采岩层会发生断裂,容易引起冲击矿压危险.
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