关键词: 采矿工程, 短壁工作面, 集中静载荷型, 冲击启动原理, 冲击地压

Abstract: This paper aims to explore the mechanism of rockburst occurrence without dynamic loading. Taking a mine of Pingzhuang Region as an example, the start-up mechanism of rockburst in short wall work face under magmatic rocks roof is studied by employing numerical analysis, theoretical analysis and field measurement method. The results show that, when the work face under magmatic rocks roof moves forwards or backwards, the lower roadway start-up occurs without dynamic loading, since the hard diabase roof provides sufficiently concentrated static load. Due to short wall mining, the lower roadway is brought into a high position and high stress area, which exacerbates the risk of rockburst occurrence. When bursting of the lower roadway happens in inclined coal seam, the principal stress of the surrounding rock is perpendicular to the dip direction of coal seam. Therefore, the burst and bulge of surrounding rock are asymmetric and localized and even its direction is corresponding to the normal direction of seam inclined plane. This study provides a new argument that asymmetrical method should be adopted to prevent rockburst in roadway support and pressure relief in the inclined coal seam.

Key words: mining engineering, short wall face, concentrated static load type, principle of burst start-up, rockburst