标题：EFFICIENT TECHNOLOGY OF COAL EXPLOITATION IN JIU VALLEY IN APPLICATION OF LONG HOLES BLASTING PROCEDURE FOR LOOSENING AND PRE-CRUSHING OF ROCK AND COAL MASSIF
期刊名称：Constantin Brancusi University's Annals, Letters and Social Sciences Serie
印刷版ISSN：1844-6051
出版年度：2011
期号：2
出版社：Academica Brancusi Publisher
摘要：Once with the application of the undermined bed exploitation method of Jiu Valley’s coal, which increased up to 3 times the thickness of extraction slices compared with classical exploitation methods, appeared the need of directional weakening and pre-crushing of coal, in order of gravity trip and coal discharge form the undermined bed. Also, directional weakening and pre-crushing of coal it is necessary for unloading and discharge areas of the bed layer, where the tilt is below the natural slope angle, and dragging of breaking line at stope start from a natural alignment. All these requirements of operation require the use of solution with mine shooting long holes of “coal – rock” massif, through security explosive cargo with great length. In the paper there is presented the necessity and opportunity of application of undermined bed coal precrushing works, as well as the technique of mine long holes shooting, rendering of safety explosive loads construction and results of laboratory tests performed for various simulated mines atmospheres.
