基于渗流力学的掘进工作面瓦斯涌出量预测

发布时间：2018-12-15 10:14

【摘要】：为了实现煤巷掘进工作面瓦斯涌出的动态预测,基于渗流力学方法,采用瓦斯的连续性方程、运动方程、状态方程和瓦斯含量方程,建立了煤壁瓦斯渗流模型,并对渗流速度进行积分,推导得到掘进工作面的瓦斯涌出量预测公式,探讨了现场掘进过程中瓦斯涌出量预测值的准确性,在所建立的煤壁瓦斯渗流模型基础上,利用控制变量法研究了煤体渗透率和原始煤层瓦斯压力2种关键因素对瓦斯渗流速度的影响。研究结果表明:利用预测公式得到的掘进工作面瓦斯涌出量预测值与现场实际基本一致,瓦斯渗流速度随煤体渗透率、原始煤层瓦斯压力均呈负指数关系变化,煤体渗透率越高、原始煤层瓦斯压力越大,煤壁暴露时瓦斯渗流速度指数衰减越明显,随着时间增加,瓦斯渗流速度无限趋近于0。
[Abstract]:In order to realize the dynamic prediction of gas emission in coal roadway driving face, based on the seepage mechanics method, the gas seepage model of coal wall is established by adopting the gas continuity equation, motion equation, state equation and gas content equation. The seepage velocity is integrated, the prediction formula of gas emission is derived, and the accuracy of the prediction value of gas emission is discussed, based on the established coal wall gas seepage model. The influence of two key factors, coal body permeability and original coal seam gas pressure, on the gas seepage velocity is studied by using the control variable method. The research results show that the predicted value of gas emission in tunneling face obtained by using the prediction formula is basically consistent with the actual situation on the spot, and the gas seepage velocity varies in a negative exponential relationship with the coal permeability and the gas pressure in the original coal seam. The higher the coal permeability, the greater the gas pressure in the original coal seam, and the more obvious the attenuation of gas percolation velocity exponent is when the coal wall is exposed, with the increase of time, the gas seepage velocity is infinitely approaching to 0.
【作者单位】：煤炭科学技术研究院有限公司安全分院;煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院);
【基金】：国家科技重大专项资助项目(2011ZX05063-009) 国家重点基础研究发展计划(973计划)资助项目(2011CB201206)
【分类号】：TD712.5

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