急倾斜煤层石门揭煤突出机理数值模拟研究

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。

Numerical Simulation on Outburst Mechanism of Uncovered Coal in the Crosscut of Steep-inclined Coal Seam

Compared with other outburst,the outburst consequence of uncovered coal in crosscut is the most serious,studying its outburst mechanism helps to improve the level of outburst prevention.The progress of outburst was simulated by means of numerical simulation software on the basis of the cavity's figure of Majiagou mine;and the geological condition and the developing process for the outburst of uncovered coal in crosscut in Majiagou mine were reproduced.The result shows that the action of coal deadweight stre...