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与其他类型的突出相比,石门揭煤的突出危险性最为严重,对它的突出机理进行研究有助于提高防突工作水平。根据马家沟矿石门揭煤突出后遗留的孔洞形状,采用数值模拟软件对突出过程进行反演分析;再现了马家沟矿石门揭煤突出发生的地质条件及发展过程。结果显示,急倾斜煤层石门揭煤突出过程中,煤体自重应力的作用比较明显;突出发生后,地应力梯度和瓦斯压力梯度均下降,卸压区宽度增大。因此,对于急倾斜煤层石门揭煤,一方面,要采取瓦斯抽放等措施,降低工作面前方煤体的应力和瓦斯压力;另一方面,要采用金属骨架对其上方煤体进行支护,防止该煤体垮落诱导突出。
Compared with other types of prominence, Shek Mun coal outburst of the most prominent danger of danger, the study of its outstanding mechanism will help to raise the level of anti-sudden work. According to the shape of the hole left behind after the coal outburst in Majiagou ore exposed, the numerical simulation software was used to invert the salient process, and the geological conditions and development process of coal outburst in Majiagou ore well were reappeared. The results show that during the coal outburst in steep seam, the self-weight stress of coal is more obvious. After the outburst occurs, the stress gradient and gas pressure gradient decrease, and the width of pressure relief zone increases. Therefore, for steep coal seam steep seam coal seam, on the one hand, to take measures such as gas drainage to reduce the stress and gas pressure in front of coal face; the other hand, to use metal skeleton to support the coal above, Prevent the collapse of the coal to induce outstanding.