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- 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;
- top coal broken mechanism 顶煤破碎机理
- On the basis of industry test,this paper analyses mining feasibility of applying roadway caving method and caving broken mechanism in high gas steeply indined medium coal seams. 在工业性试验的基础上,分析了在高瓦斯急倾斜中厚煤层中应用巷道放顶煤法开采的可行性和顶煤的破碎机理。
- 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。
- The big molecule of coal break down by the additive affixture,it can accelerate releasing of coal volatiles,make the coal lower ignition temperature. 同时使用不同的添加剂,可以在不同温度下释放出活性氧,有利于煤的完全燃烧。
- Analysis of the mechanism of coal breaking by self-excited vibration water-jet;discussion on the influence of several parameters on pulverizing efficiency. 分析了自激振荡水射流超细粉碎系统对煤粉颗粒的粉碎机理,讨论了影响粉碎效率的几种因素。
- 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。
- 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。
- 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。
- 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。
- The bending and torsional properties of Aramid fiber are tested and are compared with other fibers. Their breaking mechanism is also discussed. 对芳纶纤维的弯曲和扭转疲劳进行了测试分析;并与其它纤维进行比较;对它们的破坏机理作了探讨.
- According to the spontaneous symmetry breaking mechanism, there is a vacuum boson is not material, and it took place after particles produced quality. 根据自发性对称破缺机制，真空中有并非玻色子的物质，它和粒子发生作用后产生了质量。
- 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。
- By using a coutact gone method the chip breaking mechanism of UG chip breakers of carbide turning insert has been experimentally studied in this paper. 本文采用接触图形法对硬质合金可转位车刀片UG型断屑槽的断屑机理进行了实验研究。
- A new type bolt is developed,and breaking mechanism of present bolt-end is analyzed,and proofed breaking mechanism of new type bolt is given. 分析了现行锚杆尾部的破断机制,研制了一种新型金属粗尾锚杆,阐明了新型金属粗尾锚杆的防破断机理。通过分析,得出金属粗尾锚杆较其它锚杆不易发生断裂
- Dam Break Mechanism and Hydromechanics 溃坝机理及溃坝水力学
