hard coal

1. The research on the fractured blocks of the top coal in the longwall top coal caving technique of the hard coal seam;
   对坚硬顶煤预裂中存在的问题，采用在地应力场控制下水力压裂的方法，研究了煤层地应力场控制参数。
2. Research and Application of Deep-hole Blasting Technology in Fully Mechanized Hard Coal Mining Face
   综采工作面坚硬煤体深孔松动爆破技术的研究与应用
3. The first caving roof sections in hard coal layers can effectively reduce the pressure during the course of caving and guarantee safe production and efficiency.
   坚硬煤层顶板分段初次放顶，能够有效缓解放顶期间的顶板压力，保证安全生产，提高生产效率。
4. The paper held that the two leg shield caving powered support would not be suitable for the top coal caving mining in the hard coal seam and the joint crack undeveloped medium hard seam.
   故两柱掩护式放顶煤支架不适用于硬煤层及节理裂隙不发育的中硬煤层放顶煤开采。
5. Surrounding Rock Controlling Technology and Practice of Large Mining-height Mining Face with Hard Roof and Hard Coal
   两硬大采高围岩控制技术及开采实践
6. Study on Top-Coal Caving and Drawing Capability and Roof Control in Hard Coal and Hard Roof Short Sub-Level Caving Fully Mechanized Face
   两硬短工作面综放开采顶煤冒放性及顶板控制技术研究
7. Gelsenkirchen was mentioned in a document for the first time in1147.The discovery of hard coal in mid-1900 triggered the industrialisation of the Gelsenkirchen area.
   盖尔森基兴首次被提起是在1147年的文件里，19世纪中在这里发现了丰富的煤矿资源使得这座城市工业化。
8. This paper uses the laboratory physical resembles to simulate the top coal caving property of the hard coal seam, puts forward the top coal caving property characteristics of hard coal, and the circumstance of the pressure distributes in front of the working face.
   采用实验室物理相似模拟试验对坚硬煤层顶煤冒放性进行了研究，提出了坚硬顶煤的冒放性特征及工作面前方压力分布情况。
9. The energy compensation principle of hard coal crack and Its Applications
   硬煤裂隙能量补偿原理与应用
10. Hard Coal Mining Water Injection softening Method
    双阳煤矿硬煤开采注水软化方法
11. One topic of high-performance underground hard coal production gaining increasing importance is that of efficient gas removal.
    高效率的井下硬煤生产受到越来越多的重视，其中的一个话题就是瓦斯的有效抽采。
12. Potential of Horizontal Mine Gas Drainage for Underground Hard Coal Mining
    水平井在地下硬煤开采中的瓦斯抽采潜力
13. The Simulation of the Top Coal Caving property of Hard Coal Seam
    坚硬煤层顶煤冒放性相似模拟试验研究
14. The adsorbability of hard coal in the pretreatment of water is studied, and some worthy parameters as the reference in engineering are obtained.
    本文研究了无烟煤作为纯水制备过程预处理中的吸附剂的性能，测定出工程上有一定参考价值的参数。
15. The Resource Analysis of High Grade Hard Coal of Xishui County, Guizhou
    贵州省习水优质无烟煤资源分析
16. Injecting Water Technique and Parameters for Hard Coal Bed
    较难注水煤层的注水工艺及参数
17. Study on Coal rock Caving Laws and Control in Hard Coal and Hard Roof Sub level Caving Fully Mechanized Face
    两硬综放面煤岩冒放规律及控制研究
18. Selecting Coal Plow by Measuring Cutting Resistance in Hard Coal Seam
    测试坚硬煤层截割阻力合理选型刨煤机
19. Caving mining under the condition of hard coal and rock
    坚硬煤岩条件下放顶煤开采
20. Analysis of the First Caving of Roof Sections in Hard Coal Layers
    坚硬煤层顶板段初次放顶分析
21. Cutting Resistance Test of Hard Coal Seam and its Difficulty Degree of Digging Research
    坚硬煤层截割阻力的测试和可刨性研究
22. Study of Pre-cracking Hard Coal by Water Infusion in Sub-level Caving Mining
    坚硬煤层放顶煤注水弱化研究
23. A new kind of technique weakening top hard coal body
    一种弱化坚硬顶煤的新技术
24. Top Coal Weakening Treatment during Fully Mechanized Caving of Super-Thick Hard Coal Seam
    坚硬特厚煤层综放开采过程中顶煤松动弱化处理
25. F.injection are measured and the experimental studies on the pulverized bituminous and hard coal mixing-injection are made.
    根据研究结果，讨论了烟煤混入量对高炉喷吹操作和喷吹效果的影响；
26. According to the purpose and characteristic of the weakening blast of hard top-coal in fully mechanized caving faces, that the dynamic breaking process of hard coal mass on blasting load is also a process to accumulate continuously damage is pointed out;
    根据综放开采坚硬顶煤预先弱化爆破作用的目的和特点，认为在爆炸载荷作用下坚硬煤体的动态断裂破坏也是一个连续损伤演化积累过程。
27. The mining depth has exceeded 1000m. The seam belongs to high burst liability item with three tough conditions including hard roof, hard coal seam and hard floor.
    该矿采深已超过1000m，属于坚硬顶板、坚硬煤层、坚硬底板的三硬强冲击煤层。
28. In general coal can be simply divided into hard coal seam and soft coal seam.
    一般可简单地将煤层分为正常煤体结构的硬煤层和构造发育的松软煤层两种类型。
29. Zhu set mine coal and the small sets 11-211-2 coal seam is very similar, are relatively hard coal, gas content and pressure is relatively small, tunnel roof stress under the weight of a large rock, is caused by the accident highlighted the main factors.
    朱集煤矿的11-2煤与丁集煤矿的11-2煤层很相似，煤都比较硬，瓦斯含量和压力相对较小，巷道顶板承受的岩体自重地应力大，是引起突出事故的主要因素。
30. For the full-mechanized mining of full height in "two-hard" coal seam, its big mining height and hard coal will cause a serious problem of coal wall caving during shearer coal mining process and often produce large pieces of coal.
    对于两硬煤层一次采全高的综采工作面而言，由于采高大，以及煤质坚硬等原因，造成采煤机割煤过程中煤壁片帮严重，频繁产生大块煤炭。

noun

1. a hard natural coal that burns slowly and gives intense heat

   Synonym:    anthraciteanthracite coal