Mining outbursts

Device which actuates electric primers by using main voltage - in openpit and potash mining, for example. The switch can be located in a surface stand(shelter outside a mine) e.g. if the danger of gas outbursts exists. 

Yang X and Zhang Y. 1995. Analysis on dynamics phenomena in mine water outburst. Mine Pressure Roof Management. Vol. 1, pp. 13-15. 

Figure 3. Velocity (m/s) contours during model outburst when mining through weak fault...

With the rapid development of the national economy and the increased mining depth coal and rock dynamic disaster is increasing ay by day. In order to ensure life safety, safe, reasonable and efficient mining method are very necessary. Then the research on dynamic mechanical properties of underground rock is also very importanti l Almost all of the dynamic disaster, such as broken rock, rock burst, coal and gas outburst and other dynamic disasters had certain correlation with the rock failure under impact load and stress wave s propagation in the rocU f Because research on the dynamic mechanical properties of rock is minimal in our country, many law needs to refer to foreign datal - l, which leads to the lack of theoretical basis in China. Rock burst and other dynamic disaster tend to occur in coal seam with limestone roof Therefore, in order to effectively control the mine dynamic disasters, we must reveal its dynamic mechanical properties, thus it is very important to do the comparative study on dynamic mechanical properties of coal and limestone. 

Lama R D, Bodziony J.1998. Management of outburst in underground coal mines. Int. J. Coal Geology 35(1) ... 

Li S, Zhang H W. 2002. Coal and gas outburst model recognition and regional prediction. Proceedings of Mining Science and Safety Technology. 331-334. 

Sato K, Fujii Y. 1989. Source Mechanism of a Large Scale Gas outburst at Sunagawa Coal Mine in Japan. Pageoph 129(3) 325-343. 

Zou Yin-Hui, et al. 2007. Trial research about forecasting outburst by making use of gas content. Mining Seifety and Environment Protection 34(4) 4-6. 

Coal rock dynamic disasters such as rock burst and coal and gas outburst have always been major problems in coal mining. A lot of researches prove that coal and rock dynamic disaster is a result of coal and rock rupture quickly, being subject to the comprehensive action of stress and the physical chemistry inside and outside the body. Coal/rock undergoing deformation and failure emits many forms of energy, among which is electromagnetic radiation (EMR) (Wang Zhao 2013). 

Affected by fault F2 geological structure, rocks within the scope of 50 m near 1311 mining face belt roadway fault F2 outburst, and the coal fractured has lost its integrity and continuity. When the face advancing to the position of fault, roof accident... 

When outburst occurs in mine, airflow catastrophic will occur in intake airways connected with the source of outburst because of the great impact force produced by gas flow transiently released and of the gas pressure after the dynamic of outburst disappears, of which the most typical is airflow reverse of side branches. Therefore, this paper will use one dimensional unsteady-state flow momentum equation established above to analyze law of airflow reversalof side branches induced by gas pressure when upward ventilation airflow catastrophic occuring. 

Basil B. Beamish, Pete J. Crosdale, 1998.Instantaneous outbursts in underground coal mines An overview and association with coal type [J].International Journal of Coal Geology, 35 27-55. 

Cheng, W Y, CHEN G7f., 2000. Shockwave formation and model estabhshment induced by coal and gas outburst [J]. Safety in Coal Mines, 2000(9) 23-25. (In Chinese)... 

Dziurzynski, W, Krawczyk, J., 2008. Computer simulation of air and methane flow following an outburst in transport gallery D-6, bed 409/4 [J]. The Journal of The Southern African Institute of Mining and Metallurgy, 108 139-145. 

Wang, K., Zhou A.T, Wei G.J., 2012.Study of the formation and propagation characteristics of shock wave and gas flow of outburst at straight roadway[J]. Journal of Mining Safety Engineering, 29(4) 559-563. (In Chinese). 

Zhang, IF, Wang K., Wei C.P., 2010. Formation and propagation of shock waves during coal and gas outbursts [J. Journal of Mining Safety Engineering, 27(1) 67 71. (In Chinese). 

ABSTRACT The gas pressure in coal seam is one of the important basic parameters. Accurate and quick determination of the gas pressure in the coal seam has not only great significance for the determination of gas content in coal seam, for the control of mine gas emission, for gas drainage, and for the prevention of coal and gas outburst, but also has economic and social benefits for the safe production of coal mine. There are direct method and indirect method on the determination of gas pressure in the coal seam. Direct determination method includes active manometry and passive manometriy. This paper, on the premise of active manometriy, explores a method to rapidly determine gas pressure. 

Low air permeability coal seam has account for more than 95% of coal seams mined by the high mines and outburst mines, permeability coefficient in coal seam is just I0-3 10-4 mD thus it dreamed big to gas drainage and drainage rate is low. (Yu 1992, Wang 2005, Qin et al. 2008). 

It can be seen from the contrast before and after the measures that content of gas has decreased from 6.29 mVt to 3.9 mVt, dropped below gas critical value, eliminate the phenomenon of gas transfmite which explained that hydraulic flushing is effective to eliminate the hazard of outburst on working face. Not only improve the working environment, but also guarantee the safety production on mining faces, the effect of gas control is obvious. 

Gas group of china mining college. Prevention and Control on Coal and Gas Outburst [M], Beijing Coal industry publishing house, 1979. 

Li Jian-ming. Coal and Gas Outburst Prevention and Control Technical Manuals [M]. Xvzhou China Mining University Press, 2006. 

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