深部煤巷条带近距离底板巷卸压增透模型研究

为解决深部煤层透气性差、瓦斯抽采难度大、抽采达标时间长、抽采效率低等问题,采用实验室实验、理论分析、数值模拟、现场试验等多种研究方法,揭示了含瓦斯煤卸荷增透特性,分析了深部巷道围岩卸压、煤层增透规律,研究了煤巷条带卸压底板岩巷最优位置,给出了煤层显著增透区、一般增透区的计算方法和卸压底板岩巷与煤层合理距离的判别准则,构建了煤巷条带底板岩巷结合水力化技术卸压增透模型,工程应用表明底板岩巷上覆煤岩层卸压增透效果显著,为类似条件提供借鉴意义。

Study on pressure relief and reflection improvement model of near floor roadway in deep coal roadway

In order to achieve precise outburst prevention in the strip area of deep coal roads, it is proposed a method named "three-dimensional precise pressure relief" prevention of outbursts in deep coal road strips, which from the three dimensions of objective risk of coal road strips, outburst prevention technology and evaluation of outburst prevention effects. That is, firstly, based on the coal roadway outburst in-situ stress and gas dual force energy model. Through the analysis of the in-situ stress factors of coal roadways, the outburst risk of gas factors and the positive geological abnormalities, the objective dangers of coal roadway is divided into general dangerous normal areas and severe dangerous abnormal areas. Then, in view of the in-situ stress factors and gas factors in different dangerous areas, it is proposed that a dual pressure relief and anti-outburst technology, which is used floor rock roadway pressure relief and drainage combined with hydraulic pressure relief to increase permeability. Finally, it is proposed to use equivalent swelling deformation and residual gas content to accurately evaluate ground stress and gas pressure relief and outburst prevention effects, thus formed a three-dimensional accurate pressure relief and outburst prevention method for coal roadways and successfully applied. The speed of coal road excavation is increased to twice the original speed. It is realized the safe and rapid excavation of coal roads.