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瓦斯含量法预测煤与瓦斯突出试验研究
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摘要
目前我国已有一套较为成熟的煤与瓦斯突出预测方法,该方法对国内的煤与瓦斯突出防治工作起到了非常重要的作用,但是还存在一些不足之处,比如预测周期较长、预测为不突出时的进尺较短、低指标发生突出等。本文主要通过理论研究、现场测试、实验室研究、数值模拟等手段,利用瓦斯含量法进行煤与瓦斯突出预测的研究,并在淮南矿业集团谢桥矿6号煤层进行了现场应用。
     论文通过煤与瓦斯突出的能量来源和消耗分析,得出煤与瓦斯突出的能量量化关系;然后以一次实际发生的突出事例进行能量计算和分析,得出由游离瓦斯膨胀能和解吸瓦斯膨胀能所组成的瓦斯膨胀能提供了瓦斯突出所需的绝大部分能量的结论,这其中解吸瓦斯膨胀能对突出的发展起到非常重要的作用,而瓦斯膨胀能主要取决于煤层的瓦斯含量和瓦斯解吸速度的关系,阐述了瓦斯含量法预测煤与瓦斯突出的理论、科学。
     论文对瓦斯解吸扩散公式进行了详细的推导,从菲克第二扩散方程入手,假定合理的初始条件和边界条件,通过详细的推导得出方程的通解并给出了通解的近似解,然后对其误差进行了分析,为直接法测定瓦斯含量提供了理论基础,详细的介绍了不同条件下煤的高压吸附特征的实验方法;本文还详细的介绍了煤层瓦斯含量的直接测定方法,以及如何提高瓦斯含量测值的准确性;作者与其他研究人员合作研发了煤与瓦斯突出的数值模拟软件SIMBURST,它是将两个成熟的商业软件FLAC3D和COMET3连接/整合/耦合起来的混合三维数值计算程序,该软件综合考虑了煤体的屈服变形和煤体瓦斯的解吸流动规律及其相互作用的关系,可用该软件考察含瓦斯煤体的物理力学参数对突出临界值的敏感性,并通过逐渐增加输入的初始瓦斯含量值直至煤与瓦斯突出的发生,以此来模拟确定其瓦斯含量的临界值。
     论文对瓦斯含量法预测煤与瓦斯突出在谢桥矿6煤层进行了应用和验证。论文详细描述了谢桥矿6号煤层煤样在不同条件下的瓦斯解吸实验,并对其结果进行了分析和研究;在此基础上,对该煤层进行了瓦斯含量的直接测定实验,并根据数值模拟结果,结合其他手段确定了谢桥煤矿6号煤层(-760m标高以上)发生煤与瓦斯突出的临界瓦斯含量,进而利用瓦斯含量法对该区域进行了煤与瓦斯突出预测,其结果与现场的瓦斯动力现象、有关单位的鉴定结果相吻合,说明可以利用瓦斯含量法预测煤与瓦斯突出。
At present, China has a more mature coal and gas outburst prediction method, which has played a very important role in domestic coal and gas outburst prevention and control, but there are still some shortcomings, such as having a longer period to forecast, and the prediction distance is short, and some outburst did occur when the indicators show otherwise. In this paper, through theoretical research, field testing, laboratory studies, numerical simulation, and other means, the coal and gas outburst is predicted using the method of gas content in coal, which is applied to Xieqiao Mine in Huainan Mining Group No.6coal seam.
     The paper researches on the energy sources and dissipation of coal and gas outburst from the elastic potential energy of coal, and gets the quantitative energy relationship of coal and gas outburst; then it proceeds with energy calculation and analysis on an actual outburst example to conclude that free and desorbed gas expansion energy provides the most energy of outbursts. Gas expansion energy plays a very important role in outburst propogation. Gas expansion energy mainly depends on the relation of seam gas content and rate of gas desorption, and it elaborates the scientific fundamental of coal and gas outburst prediction method based on gas content in coal.
     The paper derived gas desorption diffusion equations, starting from Fick's second diffusion equation and assuming reasonable initial and boundary conditions, through detailed deduced general solution and the general solution of the approximate solution was given, then its error was analysed to provide a theoretical basis for the direct determination of gas content. It detailed description of the experimental method of gas desorption experiments with different conditions. The paper describes in detail the direct measurement method of gas content in coal seam, and how to improve the accuracy of the gas content measured values. Collaboration with other researchers, the author developed a numerical simulation software of coal and gas outburst named SIMBURST, It's a mixed three-dimensional numerical calculation program which connected/integrated/coupled with two mature commercial software named FLAC3D and COMET3. This software considers the coal's deformation and flow pattern of coal gas desorption and their interaction relationship, the software investigate the sensitivity on the gas outburst threshold with different parameters, by gradually increase the input of in initial gas content value, the author simulates and determines the critical value of gas outburst.
     The paper described the gas desorption experiments of Xieqiao Mine No6coal seam under different conditions in details, and the results were analyzed and studied. Based on this, a direct gas content measurement experiment was conducted. According to the numerical simulation results and the other means, the critical gas content was determined of Xieqiao Mine No6coal seam (-760m elevation above). Then the method with gas content of coal seam was used to predict the coal and gas outburst. The results was coincided with the gas dynamic phenomena on field and the identification results of the relevant units, wich illustrates the coal and gas outburst can be predicted using the method of gas content.
引文
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