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- Factors affected coal seam permeability change and its law is analyzed. 分析了煤层透气性变化的影响因素及变化规律。
- Inversive Study on the Changing Law of Coal Seam Permeability 煤层透气性变化规律的反演研究
- coal seam permeability 渗透率
- An inversive research method was proposed through analyzing the complicated changing features of permeability of coal seam and the problems existing in actual measurement. 分析了煤层渗透率的复杂变化特点和实际测量上存在的问题，提出其反演方法。
- The inversive calculation result showed that the permeability coefficient of coal seam and its changing condition can be determined by seam gas Pressure. 算例反演的结果表明，利用反演方法能够通过煤层瓦斯压力确定煤层的透气性系数及其变化状况。
- Gas drainage in high gassy coal seam with low gas permeability is always an hard solved significant technology problem in the process of safety production. 高瓦斯低透性煤层的瓦斯抽放,一直是煤矿安全生产过程中的重大技术难题。
- The coal seam of fully mechanized top-coal caving face 1151(3) in Xieqiao coal mine of Huainan mining area is soft and loose,and is of low permeability and poor wetting condition. 基于淮南矿区谢桥煤矿1151(3)综放面,煤层松软、渗透性低、湿润性差的特殊条件,采用煤层注水工艺技术降尘,在注水孔布置方式及参数、注水孔封孔工艺、注水工艺等方面采取一定的技术措施。
- Coal miners; coal seams; coal haulers. 煤矿工; 煤层; 运煤工
- The relationships between the permeability of the methane gas in coal seam and surface fractal dimension and tortuosity fractal dimension are proposed based on fractal theory and Darcy Law. 基于分形理论和达西定律,研究了孔隙的弯曲分形维数和表面积分形维数与瓦斯渗透率参数之间的关系;
- This experiment bases on different permeability in different directions of coal seam cleats.To arrange methane drainage direction the directions vertical and parallel to face cleat are adopted. 根据煤层割理渗透率的各向异性,采用垂直面割理和平行面割理两个方向布置钻孔抽放煤层气。
- Coal seams intermixed with iron ore. 煤层和铁矿混杂在一起。
- The Gaussian curvature of No.3 coal seam in Qinshui basin is calculated. 计算了沁水盆地3号煤层的高斯曲率。
- The outburst-proneness of 6# coal seam are studied with five indexes. 采用5种指标对该矿6%23煤层冲击倾向性进行了实验研究。
- outburst coal seam with low gas permeability 低透气性突出煤层
- low permeability outburst coal seam 低透气性突出煤层
- Coal seams intermixed with iron ore . 煤层和铁矿混杂在一起。
- thick coal seam with low permeability 弱透气性厚煤层
- Deep-hole presplitting explosion in coal seams with high gas content and low permeability was numerically simulated and analyzed. 摘要针对高瓦斯低透气性煤层，对深孔预裂爆破进行了数值模拟分析研究。
- coal seam with low air permeability 低透气性煤层
- coal seam with low gas permeability 低透性煤层
