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利用数值模拟计算与现场工程技术试验相结合的方法,系统的研究了在底板抽采巷实施水力压裂技术对煤层的强化增透效应与效果;研究获得了水力压裂过程中裂隙发育规律、应力重新分布规律以及渗透系数变化规律,分析获得了增透范围,并利用现场工程技术试验的方法进行了验证。将数值模拟效果应用于工程实践,实现了煤层瓦斯的高效抽采,在压裂后的1个月里,压裂区瓦斯抽采纯量达到未压裂区的3.6倍,抽采达标时间与未压裂区相比缩短了近40%,实现了煤层的长时间增透和瓦斯高效抽采。
By means of combining numerical simulation with on-site engineering and technical tests, the effect and effect of enhanced hydraulic penetration on coal seam by hydraulic fracturing in bottom extraction tunnel are systematically studied. The development rules of fractures during hydraulic fracturing are obtained, Stress redistribution law and the variation law of permeability coefficient, the range of increase penetration was obtained and verified by field engineering technology test. The numerical simulation results are applied to engineering practice to achieve efficient gas drainage in coal seam. During the first month after fracturing, the pure gas drainage in fracturing area reaches 3.6 times that of un-fractured area, Compared to unbroken area shortened by nearly 40%, to achieve a long time through the coal seam and methane efficient extraction.