构造应力对煤层顶板稳定性影响的数值分析

Numerical Analysis of the Influence to Coal Seam Roof of Tectonic Stress

煤层顶板垮落是煤矿生产常见的灾害,煤层顶板稳定性预测是防治顶板事故的关键技术措施。构造应力是影响煤层顶板稳定性的重要因素之一。利用FLAC3D软件,分析在构造应力的影响下煤层顶板在采动过程中的变形破坏特征,以及不同侧压条件下煤层顶板的移动规律。结果表明,顶板破坏在岩梁中部是由下向上发展的,在一定的条件下,随着水平构造应力的增大,顶板破坏范围逐步减小,顶板岩层的位移逐步减小。

Seam roof failure is common disaster in coal mine production ; the stability prediction of roof is the key techni- cal measures for prevention and control of roof fall accidents ; tectonic stress is one of the important factors to the stability of roof. By using FLAC3D software. The distortion destroy characteristic of coal seam roof in undermining process and the move- ment law of coal seam roof under different lateral pressure in the influence of tectonic stress are analysed in this paper. It can be concluded that the roof failure extends from the middle of the bottom of the stratified rock upwardly, under certain condi- tions, with the horizontal tectonic stress increase, the shift of roof rock layers will decrease and the destroy zone will reduce.