REV04523

• Permit No: C1980007
• IBM Index Class Name: Revision
• Doc Date: 11/21/1996
• Doc Name: SYLVESTER GULCH STABILITY ANALYSIS FOR RECLAMATION
• From: GOLDER ASSOCIATES
• To: MOUNTAIN COAL CO
• Type & Sequence: PR7
• Media Type: D
• Archive: No

The most critical circular failure surface
is specified by 16 coordinate points
Point x-surf y-surf
No. (f t) (f t)
1 465.52 6839.97
2 522.08 6852.80
3 577.77 6869.0.1
4 632.38 6888.54
5 685.72 6911.31
6 737.60 6937.26
7 787.82 6966.27
8 836.21 6998.25
9 882.58 7033.08
10 926.79 7070.63
11 968.65 7110.77
12 1008.02 7153.36
13 1044.77 7198.24
14 1078.75 7245.24
15 1109.84 7294.21
16 1119.62 7311.87
**** Simplified BISHOP FOS = 1.596 ****
s
The following is a summary of the TEN most critical surfaces
Problem Description Sylvester Gulch - Section G-G'
FOS Circle Center Radius Initial Terminal Resisting
(BISHOP) x-coord y-coord x-coord x-coord Moment
(ft) (ft) (ft) (f t) (ft) (ft-lb)
1. 1.596 280.47 7786.58 964.54 465.52 1119.62 7.372E+09
2. 1.600 312.24 7727.82 902.70 458.62 1111.39 7.111E+09
3. 1.600 306.82 7717.74 892.00 465.52 1096.32 6.491E+09
4. 1.601 325.27 7739.67 906.64 472.41 1125.22 7.315E+09
5. 1.602 158.44 7995.62 1196.81 458.62 1147.03 8.881E+09
6. 1.603 234.29 7822.69 1010.83 458.62 1102.89 6.905E+09
7. 1.603 299.62 7809.19 986.81 451.72 1159.48 9.121E+09
8. 1.603 208.49 7943.52 1141.95 424.14 1171.62 1.033E+10
9. 1.604 302.61 7735.51 919.04 431.03 1117.76 7.748E+09
10. 1.604 252.46 7894.29 1081.93 437.93 1176.45 1.019E+10
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