外文翻译--现有开采方法在矿井深部开采中应用的评估
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1、 中文 2975 字 英文原文 PROSPECTS ESTIMATION OF KNOWN SYSTEMS APPLICATION FOR COAL SEAMS MINING AT GREAT DERTH Prof.w.p.Zubov Leningrad Mining Institute Abstract: Estimation of present and future situation in technological schemes on coal mining at great depth applying highly productive mechanized complexes
2、 is presented here, Stis shown that the decrease both in operation concentration and the share of pillar mining at deep mines is connected with increasing difficulties in development working support behind the face as well as prevention of roof caving in face area. Introduction: Underground coal min
3、ing efficiency depends at Iarge extent on technical economic indices of deep mines, the level of their development being steadily increased. In transition to deeper levels specific expenditures increase parallel with the deterioration of geological conditions in coal seams mining. At mines of Donets
4、k basin where seams are mined at a depth of 500m ad more, the depth increase for every 100m results in production cost to 3-4%,here labour productivity of miners decreases in 6-8%1. One of the main effective ways to neutralize negative depth influence on under-round coal mining efficiency is to incr
5、ease average daily face output on the basis of using complex mechanization in stopping. At non-gassy mines the application of long pillar mining leads to face output in 1.2-1.65 times compared to average daily face output in longwall combined methods. Even more effective appeared to be long pillar m
6、ining in stopping under condition characterized by increased gas emission in goaf. In gassy mines the face output is determined taking into account the requirement of methane dilution up to permissible concentration, with methane emitting into ventilation current. In long wall and combined methods t
7、he intake air should enter the face along one of the development workings and the return air runs along the other development working. Maximum intake air quantity to the stope depends on both air current veloclty, regulated by safe security rules in working area and cross section area of the face wh
8、ich is free for air current passage. The factors mentioned above being of non-regulated nature, if becomes practically impossible to increase the quantity of intake air to he panel. According to the reasons discussed at mines with increased methane emission the actual average daily face output in lo
9、ngwall and combined methods in 3-5 times less than the face output level which may be reached using in full modern highly productive methods of mining. The application of long pillar mining permits prior to stopping to carry on some measures for seam degasification and use more effective schemes of
10、panel ventilation. Thus in applying both long pillar mining in the variant “face-sub-panel” and in shuttle scheme of panel ventilation relatively high face output (1000-1500t/day)may be reached at mines with relative gas emission up to 15m3/t, as well as at mines with higher gas emission when methan
11、e does not emit from the goaf. In estimating the prospects of long pillar and longwall mining as the space and plan basis for technological schemes in stopping operations at great depths, it is also necessary to evaluate the following factors. With the increase of coal seams depth, the methane conte
12、nt both in workings and in seams changes according to hyperbolic curve approaching to some limited value. The stronger influence of depth is more evident in gassy zones associated with developed areas of coal-bearing deposits containing seams composed of coal marks, high collector properties of coal
13、-earing measures and, hence ,the propogatlon of gas zone emission to greater depth are responsible for this. The mentioned regularity of methane-bearing capacity change in workings of Donetsk basin is also notieed at mines of Donetsk-Makeevsk, krasnoarmelsk, Almazno-Marjevsk,Voroshllov-gradsk and kr
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