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- hard top coal and roof seam 两硬煤层
- The caving of hard top coal of 4-2# coal seam in Tongchuan Jiaoping Coal Mining Area seriously impacts the production efficiency of the mine. 铜川焦坪矿区4-2%23煤层坚硬顶煤垮落破碎难题是严重影响矿井生产效益的"瓶颈"。
- The movement of top coal and top roof is discussed with the data observed from the caving mining of deeply inclined thick coal seam with horizontal section in Zhaogezhuang colliery of Kailuan Group. 就开滦集团赵各庄矿在急倾斜厚煤层采用水平分段开采过程中的现场观测,探讨顶煤和顶底板运移。
- Based on the analysis of the blasting factors,this paper analyzed the effect of different hole spacing upon the hard top coal by pre-splitting blast and thus obtained reasonable blasting. 在探讨爆破工艺参数的基础上,利用数值模拟技术分析不同炮孔间距对该矿坚硬顶煤预裂爆破的影响并得出合理的炮孔布置间距,为顶煤预裂爆破弱化方案的设计提供了理论依据。
- Fully mechanized top coal caving mining technology under unstable thick seam with soft roof, soft coal and soft floor 三软不稳定厚煤层条件下综采放顶煤技术
- Study on the hard top coal crushed by blasting 放顶煤开采爆破破碎硬顶煤研究
- Technical Measures to Improve Cavability of Hard Top Coal 改善硬顶煤冒放性的技术措施
- Maintenance technology of coal slide and roof fall in full mechanized caving face in soft roof, soft coal and soft floor seam 煤层综放工作面片帮冒顶维护技术
- Coal and oil are natural products. 煤和石油是天然物产。
- Based on the gushing of gas, crack of top coal and "O" circle theory, the paper brings up the design for gas drawing and ventilation method, and designs the extraction method for high output workface. 为了解决影响实现万吨工作面的问题,通过对瓦斯涌出的分析,基于顶煤裂隙分布发育规律及“O”圈理论设计了瓦斯抽放及通风排瓦斯方式,设计提出了实现高产高效工作面的回采工艺。
- Remarks:Applied to wall and roof of preheater etc. 主要用于预热器墙和顶盖等部位。
- The new building has aluminum siding and roofing. 新建筑用铝作墙板和屋顶。
- ANALYSIS OF COMPRESSIBILITY OF HARD TOP COAL UNDER HARD-AND-THICK STRATA AND CHOICE OF ITS MINING METHOD 厚硬顶板硬顶煤压缩性分析与综放开采方案选择
- The key point of Grand pressure law on working face of seam top coal caving method,the method of dealing with them,firstly caving and end caving of working face roof control are discussed. 论述了中厚煤层综采放顶煤工作面矿压显现规律和顶板管理的特点,指出了综放工作面顶板管理的方法,以及工作面初采、收作时顶板管理的要点。
- The beams receive the full weight of the walls and roof. 椽子承受着墙和屋顶的全部重量。
- 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 drawings reveal the 370Z roadster will have proportions closer to its hard top counterpart with its roof in the upright position. 图纸揭示370Z跑车将比例接近其硬顶对应其屋顶的垂直位置。
- Man can make heat by burning wood,coal and gas. 人可以用燃烧柴,煤,煤气的办法产生热量。
- The testing results of working face coal samples and roof impact tendency indicated that the coal seam belongs to high impact tendency and has pressure bumping possibility. 工作面煤样和顶板冲击倾向性测试结果表明,该煤层属于高冲击倾向性煤层,具有发生冲击矿压的能力。
- Wood, coal and oil are different kinds of fuel. 木头、煤炭和石油是不同类型的燃料。