 |
| Titel |
An explanation of large-scale coal and gas outbursts in underground coal mines: the effect of low-permeability zones on abnormally abundant gas |
| VerfasserIn |
F. H. An, Y. P. Cheng |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 8 ; Nr. 14, no. 8 (2014-08-21), S.2125-2132 |
| Datensatznummer |
250118602
|
| Publikation (Nr.) |
 copernicus.org/nhess-14-2125-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Large-scale coal and gas outbursts pose a risk of fatal disasters in
underground mines. Large-scale outbursts (outburst of coal and rock greater
than 500 t) in recent years in China indicate that there is abundant gas in
areas of outbursts containing large amounts of potential energy. The
adequate sealing properties of the roof and floor of a coal seam are
required for local abundant gas around the site of an outburst, but an
annular low-permeability zone in a coal seam, which prevents the loss by gas
migration through the coal seam itself, is also required. The distribution
of coal gas with this annular zone of low permeability is described, and it
is proposed that the annular zone of low permeability creates conditions for
confining the coal gas. The effect of this low-permeability zone on the gas
distribution is analyzed after allowing for simplifications in the model.
The results show that the permeability and length of the low-permeability
zone have a great impact on the gas distribution, and the permeability is
required to be several orders of magnitude less than that of normal coal and
enough length is also in demand. A steep gradient of gas pressure in the
low-permeability zone and the high-pressure gas in the abundant zone of gas
can promote coal mass failure and coal wall deformation, thereby
accelerating the coal and gas outburst. The high-pressure gas in abundant
zone of gas will lead to a large-scale outburst if an outburst occurs. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|