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- Roof and floor of coal seam 煤层顶底板
- Complex coal seam roof and floor conditions made stope support system low stiffness,poor stability and a very adverse the exploitation environment. 复杂的煤层顶底板条件使得采场支护系统刚度低、稳定性差,开采环境十分恶劣。
- Water channels include coal seam roof and floor mining induced fissures,faults,karstic subsided columns,Quaternary scuttles,fissure concentrated zones and badly sealed boreholes. 充水通道包括顶底板采动裂隙、断层、岩溶陷落柱、第四系天窗、裂隙密集带及封闭不良钻孔等,其中顶底板采动裂隙、断层、岩溶陷落柱为主要导水通道。
- Taking a certain coal mine in North China for example in this paper,two different water quality types of mine inflows from coal seam roof and floor aquifers have been effectively identified by applying Adaline method. 本文以华北某矿井为例 ,采用具有线性功能函数的神经元 (AdaptiveLinearElement)方法对来自煤层顶、底板含水层的两种不同水质类型矿井水进行了有效的识别。
- Application of transient electro-magnetic method in detecting water-earing structure in the roof and floor of coal face 矿井瞬变电磁法探测工作面顶底板含水构造
- 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。
- The hardness and thickness of coal seam play a great role in the vertical distribution of stress in coal and the occurrence of rock bunt under the condition of hard roof and hard floor. 在“两硬”条件下，煤层厚度与硬度的变化对煤体中的应力分布有着很大的影响，从而对煤岩体系统中冲击矿压的发生有着很大的影响。
- It is considered that the roof and floor of seam 5 are in poorer steadines,where mudstone prevails,and the roof and floor of seam 6 in better steadiness,where sandstone dominates. 5煤顶底板以泥岩分布最广，6煤顶底板砂岩、粉砂岩和泥岩均有较大分布。砂岩稳定性较好，粉砂岩次之，泥岩较差。
- The test results show that the drawing interval of 1.5 m is helpful for controlling dead-unconsolidated thin sandstone of coal seam roof and reduce sand ratio of drawn top-coal. 试验结果表明，放煤步距采用三采一放有利于控制顶板极松散细砂岩，降低放出顶煤的含砂率。
- The inrush mechanisms of high pressure groundwater from floor of coal seam and gob areas, as well as related preventing technology are the study emphases. 重点分析了深部煤炭资源开发过程中高承压水底板突出机理及其防治技术和废弃矿井老空水突出机理与防治技术。
- DISTRIBUTION OF INDUCED STRESSES IN ROOF AND FLOOR OF THE SEAM BY LONGWALL TOP-COAL CAVING IN SOFT COAL 松软煤层综放面顶底板采动应力分布规律研究
- On the basis of digital acoustic logging and density logging data, the stability of theroof and floor of the main workable coal seams in Hanzhuang wellfield of Qinshui coalfield,Shanxi. 根据数字声波测井和密度测井资料，讨论了山西沁水煤田韩庄井田主要可采煤层顶底板的稳定性。
- coal seam roof and floor 煤层顶底板
- 7.The hardness and thickness of coal seam play a great role in the vertical distribution of stress in coal and the occurrence of rock bunt under the condition of hard roof and hard floor. 研究表明,煤层围岩岩体结构控制了煤层瓦斯的赋存,岩体结构可用岩层效应厚度影响系数来表示,应用这一参数研究煤层瓦斯赋存比用煤层顶板岩性及含砂率更科学。
- Applying of Anchor Wire Support under the Conditions of Coal Seam Roof and Broken Rock Roof 锚索支护在煤层顶板和破碎岩石顶板条件下的应用
- In the process of Shanxi formation seam mining in Shaqu Colliery,the seam roof and floor sandrock aquifers constitute the direct discharge aquifers. 沙曲煤矿山西组煤层开采过程中,煤层顶底板砂岩含水层构成煤层开采时的直接充水含水层。
- It was discovered that the gallium is more than marginal grade in content and enriched in lower coal seam and floor, and occurs mainly in diaspore. 发现样品中镓的加权平均含量超过边界品位，并在煤层下部和底板岩石中显著富集，其主要地质载体为硬水铝石。
- He fell over the roof and dashed out his brains on a pile of stones below. 他从屋顶上掉下来，摔在下面的一个石堆上，撞得脑浆迸裂。
- floor of coal seam 煤层底板
- From the characteristic of prop and actual conditions of coal seam and roof in Datai pithead, the support force of the dense prop in 揝ichuan Method?is calculated. 从单体液压支柱的特性出发,结合大台井实际的煤层和顶板条件,计算了俯伪斜走向分段密集采煤法密集柱的支撑力。
