多组煤层开采采动规律数值模拟研究分析

Numerical simulation analysis of mining laws of multiple groups of coal seams

为了研究多组煤层开采采动规律,借助于UDEC数值软件进行不同工作面长度的对应数值计算,分析结果表明,顶部采空区往往出现岩块体运移速度较快、垂直位移YDISP较大的情况;中部采空区易于出现较大空隙带,底部采空区易于压实;应力集中带逐步向采空区两端部转移,而顶部采空区出现卸压带;随着顶部工作面倾向长度的增大,卸压范围越大。

In order to study the mining law of multi-group coal seams,the corresponding numerical calculation of different working face lengths is carried out by means of UDEC numerical software.The analysis results show that the top goaf often has faster rock block migration speed and larger vertical displacement YDISP.The middle goaf is easy to appear large void zone,and the bottom goaf is easy to compaction.The stress concentration zone gradually transfers to both ends of the goaf,while the pressure relief zone appears in the top goaf;with the increase of the inclined length of the top working face,the pressure relief range is larger.