掘进工作面煤壁突然压出影响因素模拟研究

Simulation study on influencing factors of coal wall sudden extrusion in heading face

基于河北邯郸郭二庄矿建立了掘进工作面三维数值模型,利用3DEC离散元模拟软件分析了煤层埋深、掘进速度及煤体力学强度对工作面煤体突然压出的影响,并采用正交试验法将各影响因素依据重要程度进行排序。研究结果表明:掘进工作面上固定点最大水平位移值与埋深变化基本呈正相关线性关系;煤壁压出位移方向均向巷道中轴线靠拢,且水平位移明显大于竖直位移;在埋深600~1000 m条件下,工作面应力集中区宽度约10 m,应力峰值位置距工作面约5 m;影响掘进工作面煤壁突然压出因素,按照重要程度依次为煤层埋深>掘进速度>煤体力学强度。研究成果为进一步认识煤壁突然压出及预防措施提供参考。

A three-dimensional numerical model of heading face was established based on Guoerzhuang Coal Mine in Handan,Hebei Province.The effects of different coal seam depths,driving speed and coal mechanical strength on the coal wall sudden extrusion are analyzed by using 3DEC discrete element simulation software,and the orthogonal experiment method is used to rank the influencing factors according to the degree of importance.The results show that there is a positive linear correlation between the maximum horizontal displacement of the fixed point on the heading face and the change of the buried depth,and the direction of the coal wall extrusion displacement is close to the central axis of the roadway,and the horizontal displacement is obviously larger than the vertical displacement.Under the condition of the buried depth of 600 to 1000 meters,the width of stress concentration area of working face is about 10 meters,and the position of the stress peak is about 5 meters from the working face.The factors affecting the coal wall sudden extrusion in heading face are in the following order:buried depth of coal seam>driving speed>mechanical strength of coal body.The research results provide a reference for further understanding of the coal wall sudden extrusion and preventive measures.