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- Coal miners; coal seams; coal haulers. 煤矿工; 煤层; 运煤工
- Coal seams intermixed with iron ore. 煤层和铁矿混杂在一起。
- close coal seams 近距离煤层
- Coal seams intermixed with iron ore . 煤层和铁矿混杂在一起。
- Research and Application of the Technique of Upward Mining in and its applicoa Lonely Island Zone for Closed Coal Seams 近距离煤层孤岛区域上行开采技术研究与应用
- Under the tectonic stress,the deformations of coal seams and the adjoining rock strata infault-block structural area are of good coordination and close correlation. 断块构造区域内煤层及其周围岩层在构造应力作用下的形变具有很好的协调性和密切的相关性。
- Under the condition of close distance coal seams ascending mining in Suncun coal mine, using RFPA numerical analysis software, we analyzed the stress environment of the upper coal seam. 采用RFPA数值分析软件，对孙村矿深部近距离煤层上行开采条件下，上位煤层回采巷道的应力环境进行了分析；
- Under the condition of close distance coal seams ascending mining in Suncun coal mine,using RFPA numerical analysis software,we analyzed the stress environment of the upper coal seam. 结合覆岩导水裂隙带的观测结果,探讨了上位煤层回采巷道的稳定性,证明上行开采条件下上位二层煤的回采巷道稳定性较下行开采有较大的改善;
- Numerical simulation was conducted using UDEC3.0 for the movement of overlaying strata and fracture development caused by the mining of upper protective layers of coal seams with close quarters. 本文利用UDEC3.;0软件对近距离上保护层开采导致的覆岩移动及裂隙发育过程进行数值模拟。
- 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。
- 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。
- 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。
- The thicker coal seams are located in a 10-15 kmwide belt along which the channel meanders. 较厚的煤层位于河道发生弯曲的、宽10-15公里的地带内。
- The thicker coal seams are located in a 10-15 km wide belt along which the channel meanders. 较厚的煤层位于河道发生弯曲的、宽10-15公里的地带内。
- The State shall encourage coal mining enterprises to carry out second mining or extract residual coal at the margins of mining areas and very thin coal seams. 国家鼓励煤矿企业进行复采或者开采边角残煤和极薄煤。
- However,recent explorations have shown that the Zhiluo Formation also has some minable coal seams in a certain area. 二道岭矿区侏罗系的成因属鄂尔多斯中生代盆地西缘的陆相碎屑沉积,岩石地层自下而上为富县组、延安组、直罗组和安定组。
- The application of the gas drainage technology in Donghai coal mine is introduced, including gas drainage in close coal layer, gas drainage in goaf, gas drainage from coal, and local gas drainage. 介绍瓦斯抽放在东海矿的应用,抽放方式为邻近层抽放、空区抽放、本煤层抽放及局部抽放。
- Prewetting of coal seams by water infusion is an essential measure for dust control at working faces. 煤层注水预湿是采煤工作面防尘的治本措施，添加湿润剂是改善煤层注水效果的重要途径。
- No.6 and 7 coal seams are anthracites characterized by low ash,super-low sulf... 近南北向和北北东向的断裂为正断层,对马头岭赋煤向斜构造造成切割破坏,使西翼浅部煤层未能保存。
- Industrial important coal seams in the basin's northeastern side along the strike are predicted. 预测在盆地东北侧沿走向应有工业价值的煤层存在。
