不同采煤方法开采深部厚煤层超前支承压力对比分析

Contrastive analysis of advanced bearing pressures in the mining process of deep and thick seam with different mining methods

深部厚煤层开采深度大、工作面矿压显现剧烈,利用FLAC3D数值模拟技术结合试验工作面的实际条件,研究了分层开采和综放开采时围岩应力分布情况。研究结果表明两种开采方法的高低应力分区特征基本相同,但超前支承压力峰值不同:上分层开采超前支承压力峰值大于下分层开采超前支承压力峰值大于综放开采超前支承压力峰值,且综放开采的超前支承压力峰值深入煤壁的距离较大,能够有效降低工作面煤壁前方的应力集中程度。

There was fierce strata behaviors in working face of deep and thick seam,based upon the actual conditions of test working face,the stress distributions in surrounding rocks when using slicing mining method and fully mechanized caving method were studied by numerical simulation software FLAC3 D.The results showed that the two kinds of mining methods had basically the same stress distribution characteristics,while the peaks of advanced bearing pressures were different.The peak of advanced bearing pressure when higher slicing mining was bigger than that when lower slicing mining,while the peak of advanced bearing pressure when fully mechanized caving mining was smaller than that when lower slicing mining and the peak position was farther from the coal wall,which could effectively reduce the stress concentration degree in front of the coal face.