大采高开采覆岩结构及运动特征数值分析

Numerical Analysis of Overburden Structure and Movement Law in Large Mining Height

以山西某煤矿15302工作面为研究对象,采用FLAC3D数值模拟软件,建立数值计算模型,通过计算机模拟研究表明,工作面超前支承压力与工作面位置的远近成反比关系,同时开采时沿倾向工作面前方煤体的塑性区宽度基本一致,同时工作面顶底板煤岩存在严重的拉破坏和剪切破坏,工作面两侧的煤壁前方处于塑性破坏区域分布范围达15 m,而且与工作面中部的煤岩屈服破坏情况相反,顶板的破坏范围比底板和煤层的范围要大。对指导大采高工作面矿压显现规律及控制的研究具有现实指导意义,同时对其他类似条件的矿区具有重要的参考价值。

In order to study the overburden structure and movement characteristics of mining with large mining height,this paper takes 15302 working face of a coal mine in Shanxi Province as the research object,uses FLAC3D numerical simulation software to establish a numerical calculation model.Through computer simulation research,it is shown that the advance bearing pressure of working face is inversely proportional to the distance of working face position,and at the same time,the plastic zone width base of coal body in front of inclined working face is mined.At the same time,there are serious tensile and shear failure in the roof and floor of the working face.The front of the coal wall on both sides of the working face is located in the plastic failure area with a distribution range of 15 m.In contrast to the yield failure of the coal rock in the middle of the working face,the failure range of the roof is larger than that of the floor and coal seam.It has practical guiding significance for guiding the research of the law and control of the mine pressure appearance in the working face with large mining height,and also has important reference value for other similar mining areas.