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long drill
相关语句
  长钻头
     Long drill with high stiffness
     高刚性长钻头
短句来源
  “long drill”译为未确定词的双语例句
     Experiment of Gas Drilling with Horizontal Long Drill Bores in 1307 Mining Face
     1307工作面顺层长钻孔瓦斯抽放试验研究
短句来源
     MEASURES FOR ENHANCING THE EFFICIENCY OF PUMP-SUCTION REVERSE CIRCULATION BORING OF DEEP AND LONG DRILL HOLE CAST - IN - PLACE PILE
     提高深长钻孔灌注桩泵吸反循环钻进效率的措施
短句来源
     Study on Coal Seam Roof Gas Drainage from the Strike of Annular Fracture Areas by the Long Drill Method
     开采煤层顶板环形裂隙圈内走向长钻孔法抽放瓦斯研究
短句来源
     Technology and Application of Leading Control Coal Petrography by Long Drill Pipe
     长钻杆超前控制煤岩技术及其应用
短句来源
     Analyzed the movement law of unloading press of roof rock and the influence of the roof rock structure and the key seam changing on it,and put forward a method of long drill gas drainage to the unloading press area strike,by using the developing character of its cracks.
     分析了回采工作面回采过程中顶板覆岩卸压移动规律及其顶板覆岩结构与关键层层位对覆岩移动规律的影响,提出了利用采动煤层顶板覆岩卸压裂隙发育特征,实施覆岩卸压区走向长钻孔抽放瓦斯.
短句来源
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  相似匹配句对
     Long drill with high stiffness
     高刚性长钻头
短句来源
     Construction technique of super long drill-pouring pile
     超长钻孔灌注桩的施工技术
短句来源
     Long-span P.C.
     C.
短句来源
     Long Absence
     长时间缺席
短句来源
     The development of mountain drill
     国内外山地钻机的发展
短句来源
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  long drill
This paper deals with the investigation of the upper 11.6 m portion of a long drill core (KDP-01) taken from the bottom sediments of Lake Khubsugul.
      
Long drill cores are placed inside a fixed plastic tube with an inner diameter of 64 mm and a length of 2.2 m.
      
Again the inhibited response of the long drill string to ship movement slowed the operation.
      


On the basis of analysing the cause of the circulation break off and drilling speed lowering of the deep and long drill hole cast - in - place pile during the construction of the pump-suctuon reverse circulation boring, the paper presents the measures to enhance the effciency of this kind of boring.

在分析用泵吸反循环钻进施工深长钻孔灌注桩时循环中断、钻速低的原因基础上,提出了提高反循环钻进效率的措施。

To solve the problem of exceeding gas concentration in the mining and distressing areas, the method of simulated calculation of numerical value and industrialized experimental research is applied in the thesis in overlying formation. Due to its characteristics of floating and seepage, gas from large destressing areas would pass through facture aisles and gather in annular fracture areas and form a stock of gas. The method of long-drill of gas suction in the annular fracture areas, which can stop...

To solve the problem of exceeding gas concentration in the mining and distressing areas, the method of simulated calculation of numerical value and industrialized experimental research is applied in the thesis in overlying formation. Due to its characteristics of floating and seepage, gas from large destressing areas would pass through facture aisles and gather in annular fracture areas and form a stock of gas. The method of long-drill of gas suction in the annular fracture areas, which can stop the flowing of the gas to upper corners, properly solved the technical problem of gas suction in soft coal beds.

对于低透气性高瓦斯煤层群开采的首采工作面,或厚煤层开采一分层的工作面回风流中的瓦斯浓度超限问题是一大难题,为解决此难题,通常采用顺层钻孔、穿层钻孔抽放瓦斯措施,收到了一定的效果,问题尚得到较好解决。开采煤层工作面的瓦斯主要来源于本煤层、采空区和邻近层的卸压解吸瓦斯,由于煤层松软,顺层钻孔施工难,不便进行顺层钻孔抽放瓦斯,若对采空区实施大面积抽放,工程难度大,而且抽不出高浓度瓦斯。煤层回采后,采空区顶底板岩层卸压,产生裂隙。由于瓦斯的升浮漂移和渗流特性,来自于开采煤层和卸压煤层内卸压瓦斯,沿裂隙通道汇集到裂隙区,形成瓦斯积存库。把抽放钻孔或巷道布置在顶板裂隙内,实施瓦斯抽放,该抽放瓦斯技术起到了对开采工作面上隅角瓦斯的截流作用,解决了松软低透气性高瓦斯煤层群开采瓦斯抽放困难的关键技术难题。

Gas in working faces is mainly produced in the destressing and desorption process of the coal bed,gobs and adjacent strata.The coal beds are too soft to carry out bedding drilling and draw gas effectively.If gob gas suction is adopted in a large area,the project will prove not only extremely difficult,but also fail to draw out gas of high concentration.Therefore,efficient gas suction is technically determined by seeking fracture aisles for gas movement and gas zone of enrichment.In the course of mining and destressing,...

Gas in working faces is mainly produced in the destressing and desorption process of the coal bed,gobs and adjacent strata.The coal beds are too soft to carry out bedding drilling and draw gas effectively.If gob gas suction is adopted in a large area,the project will prove not only extremely difficult,but also fail to draw out gas of high concentration.Therefore,efficient gas suction is technically determined by seeking fracture aisles for gas movement and gas zone of enrichment.In the course of mining and destressing, gas originating from large destressing areas will go through the fracture aisles of the full development areas and gather in annular fracture areas.The similar material experiments in the laboratory,the numerical simulation and the in-situ study are applied in this work in order to find the location of annular fracture areas in overlying formation.The long-drill mehtod for gas suction along the strike of annular fracture areas is adopted.Mining in coal beds with gas of high conentration and low permeability and gas suction can be operatod separately. During mining activities in the working faces,gas released from roof fracture areas will not flow into upper corners,so the technically drilling problem in soft coal beds with low permeability and high concentration gas can be solved.The application of this technology in the working faces of the gassy mines in Huainan shows that gas suction rate is above 60 percent, making it possible to mine safely,efficiently and intensively.

开采煤层工作面的瓦斯主要来源于该煤层、采空区和邻近层的卸压解吸瓦斯。由于煤层松软 ,顺层钻孔施工难 ,不便钻孔抽放瓦斯。若对采空区实施大面积抽放 ,工程难度大 ,而且抽不出高浓度瓦斯。因此 ,寻找瓦斯运移的裂隙通道和瓦斯富集区 ,实施有效的瓦斯抽放工程是实现高效瓦斯抽放的技术关键。采用实验室相似材料试验、数值模拟计算和工业性试验研究方法 ,研究寻找采场上覆岩层中环形裂隙圈形成机理和位置 ,把抽放钻孔布置在环形裂隙圈内 ,进行“环形裂隙圈内走向长钻孔法”瓦斯抽放。这种瓦斯抽放技术使低透气性高瓦斯煤层的开采和瓦斯抽放分层区进行 ,在开采层工作面采煤 ,在顶板层裂隙区抽放卸压瓦斯 ,对流向工作面上隅角的瓦斯起到了截流作用 ,解决了松软低透气性高瓦斯煤层群开采瓦斯抽放困难的关键技术难题。该瓦斯抽放技术在淮南矿区高瓦斯工作面的应用结果表明 ,采煤工作面瓦斯抽放率达到 6 0 %以上 ,实现煤层群首采煤层安全、高效、集约化开采

 
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