OUTBURST
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factors |
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coal |
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volumetric change |
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Volumetric Change
Interest in coal shrinkage and swelling dates back almost 100 years, the table below lists various studies undertaken from the turn of the last century to the present day.
Reference |
Gas |
swelling/shrinkage coefficient,MPa-1 |
| Moffat & Weale (1955) |
CH4 | 1.17 x 10-8 |
| Gunther (1968) |
CH4 | 1.90 x 10-8 - 4.76 x 10-8 |
| Wubben, Seewald and Jurgen (1986) | CH4 | 9.65 x 10-9 - 4.76 x 10-8 |
| Reucroft & Patel (1986) |
CO2 | 4.52 x 10-7 |
| Gray (1987) |
CH4 | 1.25 x 10-4 |
| Gray (1987) |
CO2 | 1.82 x 10-3 |
| Juntgen (1987) |
CH4 | 1.77 x 10-6 |
| Harpalani & Schraufnagel (1990) | CH4 | 4.27 x 10-8 |
| Harpalani & Chen (1997) |
CH4 | 2.30 x 10-8 |
| St. George & Barakat (2001) |
CH4 | 1.20 x 10-3 |
| St. George & Barakat (2001) |
CO2 | 5.20 x 10-3 |
| Seidle & Huitt (1995) |
CH4 | 1.96 x10-4 |
| Seidle & Huitt (1995) |
CO2 | 1.78 x10-4 |
| Levine (1996) |
CH4 | 1.30 x10-3 |
| Levine (1996) |
CO2 | 5.50 x 10-3 |
| Dunn & Alehossein (2002) |
CH4 | 1.77 x 10-3 - 1.95 x 10-3 |
| < | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | > |