含瓦斯煤Forchheimer型非达西渗流实验研究

发布时间：2018-07-12 11:45

本文选题：非达西渗流 + Forchheimer方程　；参考：《矿业安全与环保》2017年06期

【摘要】：针对目前非达西渗流在含瓦斯煤三轴应力状态下研究较少的问题,基于Forchheimer型非达西渗流理论,采用自行研制的含瓦斯煤准三轴渗流试验装置,研究了2个煤矿的贫煤煤样在不同围压、轴压条件下Forchheimer型非达西渗流特性并计算了相关参数。研究结果表明,三轴应力状态下煤样中瓦斯气体流速随瓦斯压力梯度的变化而出现明显的Forchheimer型效应。相同介质和流体下,瓦斯压力和三轴应力状态成为煤体瓦斯渗透规律的主要影响因素。不同围压、轴压条件下,瓦斯渗透速度会随瓦斯压力的增大而增大,但其渗透速度的增大速率最终会趋于恒定。相同围压下,非达西渗流因子β随轴压的增大而增大,且β越大,压力梯度与渗流速度之间的非线性关系越明显,而非达西渗透系数K值会有减小的趋势。
[Abstract]:In order to solve the problem that non-Darcy seepage is studied under the condition of gas-bearing coal triaxial stress, based on Forchheimer's non-Darcy seepage theory, a self-developed quasi-triaxial seepage test device for gas-bearing coal is developed. The characteristics of Forchheimer type non-Darcy percolation under different confining pressure and axial pressure of lean coal samples in two coal mines were studied and the relevant parameters were calculated. The results show that the flow velocity of gas in coal samples changes with the gas pressure gradient under triaxial stress state and there is obvious Forchheimer type effect. Under the same medium and fluid, gas pressure and triaxial stress state are the main influencing factors of coal gas permeability. Under the condition of different confining pressure and axial pressure, the gas permeation velocity will increase with the increase of gas pressure, but the increasing rate of gas permeation velocity will eventually be constant. Under the same confining pressure, the non-Darcy percolation factor 尾 increases with the increase of axial pressure, and the greater the 尾, the more obvious the nonlinear relationship between the pressure gradient and the seepage velocity, but the non-Darcy permeability coefficient K will decrease.
【作者单位】：山西工程技术学院矿业工程系;中国矿业大学(北京)资源与安全工程学院;中国矿业大学(北京)共伴生能源精准开采北京市重点实验室;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;
【基金】：国家自然科学基金项目(51374216)
【分类号】：TD712.51

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