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- 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"。
- 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。
- 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
- 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
- hard top coal 坚硬顶煤
- hard top coal and roof seam 两硬煤层
- An automobile designed to look like a convertible but having a rigidly fixed, hard top. 金属顶盖式汽车具有看似篷式汽车但却有固定的顶篷设计的汽车
- An automobile designed to look like a convertible but having a rigidly fixed,hard top. 金属顶盖式汽车具有看似篷式汽车但却有固定的顶篷设计的汽车
- The top coal's recovery ratio in fully-mechanized sublevel caving face controls the stowing degree of the goaf, thereby influences the stability of hard and massive overlying roof. 摘要综放采场顶煤放出率控制着采空区的充填状况,从而影响着大厚度坚硬顶板的稳定性。
- An automobile designed to look like a convertible but having a rigidlyfixed, hard top. 金属顶盖式汽车具有看似篷式汽车但却有固定的顶篷设计的汽车。
- 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。
- The Z4 bucks the trend among modern convertibles by forgoing a retractable hard top. 宝马Z4不顾近两年的硬顶潮流,独爱软质顶篷,是其不随波逐流的另一前卫表现。
- These editions feature a removable hard top, Grand Prix White paint scheme, red leather interior, and numbered plaques. 这些版本的功能可拆卸硬顶,大奖赛白漆计划,红色真皮内饰,和编号斑块。
- 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;
- Differences with the hard top include a wider windscreen and daytime running lights. 差异与硬顶包括更广泛的挡风玻璃及日间运行灯。
- 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。
- Butterfly tails by cutting lengthwise through centers of hard top shells and meat. 沿纵向中心线将虾尾里层的壳和肉剖开,成蝴蝶状。
- Hard top and soft top.Gunmetal grey.Imported from UK, only one owner (me). 14k on the clock.MP3 ipod stereo. 棍波炭灰色恒温冷气合金铃合金铃皮位防盗雨档音响私让保养佳性能良好牌费至.
- 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。