A study of the cavities that form in dynamic phenomena in coal mines

1995 ◽  
Vol 77 (6) ◽  
pp. 3547-3550
Author(s):  
N. S. Khapilova
Keyword(s):  
Coal Mines ◽  
Dynamic Phenomena

scholarly journals Research on Temperature Variation during Coal and Gas Outbursts: Implications for Outburst Prediction in Coal Mines

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5526
Author(s):  
Chaolin Zhang ◽  
Enyuan Wang ◽  
Jiang Xu ◽  
Shoujian Peng
Keyword(s):  
Large Scale ◽  
Coal Mines ◽  
Prediction Method ◽  
Coal Temperature ◽  
Local Experience ◽  
Operation Process ◽  
Coal And Gas Outbursts ◽  
Short Time ◽  
Dynamic Phenomena ◽  
Main Factor

Coal and gas outbursts are among the most severe disasters threatening the safety of coal mines around the world. They are dynamic phenomena characterized by large quantities of coal and gas ejected from working faces within a short time. Numerous researchers have conducted studies on outburst prediction, and a variety of indices have been developed to this end. However, these indices are usually empirical or based on local experience, and the accurate prediction of outbursts is not feasible due to the complicated mechanisms of outbursts. This study conducts outburst experiments using large-scale multifunctional equipment developed in the laboratory to develop a more robust outburst prediction method. In this study, the coal temperature during the outburst process was monitored using temperature sensors. The results show that the coal temperature decreased rapidly as the outburst progressed. Meanwhile, the coal temperature in locations far from the outburst mouth increased. The coal broken in the stress concentration state is the main factor causing the abnormal temperature rise. The discovery of these phenomena lays a theoretical foundation and provides an experimental basis for an effective outburst prediction method. An outburst prediction method based on monitoring temperature was proposed, and has a simpler and faster operation process and is not easily disturbed by coal mining activities. What is more, the critical values of coal temperature rises or temperature gradients can be flexibly adjusted according to the actual situations of different coal mines to predict outbursts more effectively and accurately.

CLASSIFICATION OF DYNAMIC PHENOMENA IN COAL MINES

Ugol ◽  
2016 ◽  
pp. 47-53
Author(s):  
V.S. Zykov ◽  
◽  
T.I. Lazarevich ◽  
◽  
◽  
...  
Keyword(s):  
Coal Mines ◽  
Dynamic Phenomena

Possible causes of dynamic phenomena in coal mines

1975 ◽  
Vol 11 (1) ◽  
pp. 9-11
Author(s):  
M. S. Antsyferov ◽  
N. G. Antsyferova ◽  
T. I. Santalova
Keyword(s):  
Coal Mines ◽  
Dynamic Phenomena

Influence of Magnetic Fields on Solar Hydrodynamics: Experimental Results

1977 ◽  
Vol 36 ◽  
pp. 143-180 ◽  
Author(s):  
J.O. Stenflo
Keyword(s):  
Solar Activity ◽  
Energy Balance ◽  
Magnetic Fields ◽  
Solar Atmosphere ◽  
General Problem ◽  
Solar Rotation ◽  
Active Regions ◽  
Physical Conditions ◽  
Dynamic Phenomena

It is well-known that solar activity is basically caused by the Interaction of magnetic fields with convection and solar rotation, resulting in a great variety of dynamic phenomena, like flares, surges, sunspots, prominences, etc. Many conferences have been devoted to solar activity, including the role of magnetic fields. Similar attention has not been paid to the role of magnetic fields for the overall dynamics and energy balance of the solar atmosphere, related to the general problem of chromospheric and coronal heating. To penetrate this problem we have to focus our attention more on the physical conditions in the ‘quiet’ regions than on the conspicuous phenomena in active regions.

Sign in / Sign up

Export Citation Format

Share Document