PERMFILE139682

• Permit No: C1981025
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: GEOTECHNICAL CHARACTERISTICS OF MINE 3 COAL
• Section_Exhibit Name: 3.0 APPENDIX 3-E
• Media Type: D
• Archive: No

• TABLE 3
PEAK INTACT ROCK PROPERTIES
Peak Intact.
Number Peak Intact Angle of
of 2 Cohesion Internal Friction
Rock Typel Samples r2 (psi) (degrees)
Floor Sandstone 11 0.95 3033 ~ 44.3
Main Coal 29 0.85 517 38.3
Top Coal 3 0.78 367 42.0
Immediate Roof
Siltstone Not Calculated
Roof Sandstone nl 8 0.87 2588 58.9
Roof Sandstone ~2 3 0.98 2610 51.4
Roof Sandstone r3 2 ---- 939 70.6
Roof Sandstone #'4 2 ---- 3265 48.1
Roof Sandstone ~5 4 0.98 2657 59.3
Roof Siltstone 3 0.22 3565 47.4
Notes•
1. See Figure 3 for location of these rock types.
Lithologic descriptions of rock types are
presented in Table 5.
2. Goodness of fit parameter for the linear
regression.
3. Conversion factor:
1 psi = 6.8948 x 10-a MPa
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