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- This is the base to explain the relation between the gas outburst and the broken coal seam when uncovering coal in crosscut rationally. 从而很好地解释了石门揭煤条件下煤体破碎程度与突出的关系。
- Because of crack structure,high gas amount,concentrated stress,soft and broken coal,it's very difficult for tunneling. 巷道在掘进时由于受断裂构造的影响,瓦斯含量大,应力集中,煤体松软、破碎,掘进困难。
- 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。
- The stores condition of Huolinhe first opencut coal seam is complicated,coal mining needs to choose and peeling needs not only to punching explode but also to broken to abandon. 霍林河一号露天矿煤层赋存条件复杂,采煤需要选采,剥离需穿孔爆破,破碎排弃,为了简化采煤、剥离工作面作业环节,降低运营成本,对露天采矿机工艺在霍林河一号露天矿采煤及剥离工程中应用的可行性进行研究。
- Coal miners; coal seams; coal haulers. 煤矿工; 煤层; 运煤工
- 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。
- Coal seams intermixed with iron ore. 煤层和铁矿混杂在一起。
- When resin bolt is used in soft broken tunnel roof,it is extremely easy to create the glue abate. 松软破碎的巷道顶板在使用树脂锚杆支护时,极易造成粘结失效现象。
- 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 coal seam of No. 5102 face in Wuyang coal mine is steep, soft, and undulate.Aiming at this problem, the displacement and stress of top coal, roof and floor were researched by using UDEC software. 摘要针对五阳煤矿5102工作面倾角大、煤层松软、煤层起伏大、综放开采的条件，利用UDEC数值模拟软件分别通过沿工作面走向和倾向剖面建立模型，对顶板（煤）、底板的位移和应力变化进行了研究。
- Research has been in progress round the technology difficult problem that mines in the thick coal seam of extremely soft rock and easy self-ignition of TieFa coal industry group by this thesis.1. 本论文围绕铁法煤业集团小康矿极软岩层、易自燃厚煤层开采的技术难题进行了研究。
- Research has been in progress round the technology difficult problem that mines in the thick coal seam of extremely soft rock and easy self-ignition of TieFa coal industry group by this thesis. 本论文围绕铁法煤业集团小康矿极软岩层、易自燃厚煤层开采的技术难题进行了研究。
- Coal seams intermixed with iron ore . 煤层和铁矿混杂在一起。
- The occurrence of rock burst not only need a great deal of elastic energy gathering in the coal seam and the around rock stratum, but also the external energy released by the main key stratum break. 冲击矿压的发生需要煤层及其周围岩层中聚集大量的弹性能外，还需要主关键层破裂等释放的外部能量；
- Taking gas control of workface as example, this paper introduces high break exhaust roadway, coal seam driling pre - exhanst and exhaust of coal seam end roadway,comprehansive method control gas. 以综采工作面瓦斯治理方法为例,介绍了在高瓦斯地质条件下所采取的高位裂隙抽放巷、煤层钻孔预抽、煤层尾巷抽放等方法,综合治理瓦斯。
- The way and principle of Gaussian curvature method for forecasting natural fracture zones in coal seam are discussed. 摘要论述了高斯曲率法预测煤层天然裂隙发育区的基本原理和方法。
- The two-lane road into Beattyville, Kentucky, twists through breathtaking Appalachian foothills, past rusty machinery and heaps of broken coal left over from the last strip-mining boom. 小小的手制标牌表示土地准备出售，但却无人问津--石头太多无法进行商业化农业经营；
- Outburst prevention technique of excavating in coal seam will be directly concerned colliery safety production and excavates taking over. 摘要突出煤层煤巷掘进防突直接关系到煤矿的安全生产和采掘接替。
- The formation of broken coal whili miner works is analysed,the influence of cutting parameter to coal lump rate is discussed,some feasible waysto raise coal lump rate are put foreward. 分析了采煤机割煤时形成碎块的原理,就采煤机截割参数对原煤块率的影响作了探讨,提出了在现有的综采装备条件下,通过改变采煤机的截割方式,提高原煤块率的几条可行途径。
