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- The paper is on the basis of big thickness, high ductility, bad cavibility of second coal seam in Lingwu mining district, and the fully mechanized top coal caving method is hard to broaden. 本论文选题针对灵武矿区二号煤层厚度大、高韧性、冒放性差,综采放顶煤开采工艺难以推广的技术难题展开研究。
- 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。
- Fine grain grade with high hardness and high toughness. 具有高硬度和高韧性,晶粒度为细级别的牌号。
- The top coal broken mechanism and reasonable determination of caving coal heigh in caving coal faces are expounded. 主要阐述了放顶煤工作面顶煤破碎机理及放煤高度的合理确定;
- Combines high hardness with high toughness and good edge stability. 该牌号具有很高的硬度、高的韧性和很好的切面稳定性。
- It is key problem to raise the top coal recovery rate of the fully mechanized sublevel caving mining. 提高顶煤放出率是综放开采的一个重大课题,预注水弱化顶煤是解决这一问题的有效方法之一。
- Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face. 实践证明,孤岛综放工作面快速推进技术是可行的。
- 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"。
- This article introduced applications,observation and research's actuality and developing trend of fully mechanized top coal caving mining under water. 介绍放顶煤开采技术在水体下采煤领域中的应用情况、观测研究现状及其发展趋势。
- In 1997, the Xingtai Mine succeeded in using bolting &boltmesh supporting tech. in coal roadway(supporting the top coal along the bottom). 1997年,邢台矿在全煤(沿底托顶煤)巷道采用锚杆加锚索的支护技术获得成功。
- The law of top coal movement on a fully mechanized longwall face with top coal caving wasanalysed thoroughly on the basis of field observation andfinite element calculation. 本文根据现场观测、数值计算以及理论分析,详细阐述了放顶煤采场的顶煤变形运动规律,指出了顶煤变形运动可划分成四个区:顶煤变形区,压裂区,松动区和放落区。
- RKK Milling, planing, impact and percussion. High toughness for medium wear resistance. Well suitable for brazing. 铣削、刨平、挤压和冲击操作。在中等磨损条件下具有高的韧性。很适合硬焊。
- In early application of fully mechanized top coal mining,Spontaneous fire took place when the backout of fully mechanized top coal caving face was stopped mining. 在应用综放开采的初期,每当综放工作面停采回撤时,就会发生自燃发火。
- Milling, planing, impact and percussion. High toughness for medium wear resistance. Well suitable for brazing. 铣削、刨平、挤压和冲击操作。在中等磨损条件下具有高的韧性。很适合硬焊。
- Its sinter has high toughness, excellent sintered property and bending strength owing to martensitic transformation. 其烧结体由于马氏转变而具有高的韧性,优良的烧结性能和抗弯强度;
- It is put forward that the top coal of low gaseous steep seam can be caved only when the top coal is in the limiting equilibrium state of stress under the abutment pressure. 应用弹塑性理论分析了矿山压力对急倾斜煤层顶煤破碎的作用,认为在低瓦斯急倾斜煤层中只有当顶煤在支承压力的作用下进入应力极限平衡状态时,顶煤才可放出,据此计算顶煤可能的分段高度。
- It is simple and reliable that DWTT result judge high stress and high toughness pipeline. 落锤撕裂试验 (DWTT)作为一种比较可靠的高强度高韧性管线钢的断裂判据 ,简单可靠。
- Taken Xinhe Colliery 3101 workface as the concrete condition, phenomenon law of underground pressure in great-inclined thick coal seam mechanized top coal caving is studied. 本文以新河煤矿3101工作面为具体条件,研究了大倾角厚煤层综放开采矿压显现规律。
- Using modified distinct element method, simulation research is conducted on top coal movement at fully -mechanized working face in No2 Coalmine of Dayan Coal Bureau. 用改进的离散元法对大雁矿务局二矿综采放顶煤工作面顶煤活动规律进行模拟研究,分析支架围岩作用关系,找到顶煤丢失原因。
- Its grains are composed of small crystals in high toughness and strong strength and of excellent self-sharpening performance. 特点:磨粒由微小晶体组成,韧性大,强度高,磨粒自锐性好。