2014-10-10_PERMIT FILE - C1996083 ‎(8)‎

• Permit No: C1996083
• IBM Index Class Name: Permit File
• Doc Date: 10/10/2014
• Section_Exhibit Name: Volume IIIA Exhibit 15 Subsidence Prediction
• Media Type: D
• Archive: No

Table 15 -3
Predicted Subsidence Bowie #1 Mine
Panels 11 and 12 North thru Jan 1991
Monument
Stations
Measured
Subsidence
Predicted
Subsidence
Comments
41
0.62
2.6
Barrier pillar
40
0.93
2.6
Barrier pillar
39
1.83
2.5
38
2.34
2.6
Panel Center
37
1.26
2.6
52
1.32
2.6
53
1.22
2.7
Barrier pillar
54
1.22
2.7
Barrier pillar
55
1.25
2.1
Barrier pillar
56
1.27
2.1
57
1.34
2.2
58
1.50
2.4
59
1.81
2.4
Panel Center
60
1.73
2.4
Panel Center
61
1.32
2.4
62
0.95
2.5
63
0.70
2.6
64
0.71
2.6
Barrier pillar
65
0.59
2.6
Barrier pillar
66
0.49
2.7
Barrier pillar
67
0.56
1.6
Mains
68
0.38
1.6
Mains
69
0.46
1.6
Mains
Surface curvatures and strains approximately four times larger than those typically
experience in Britain have been measured in the U.S. (O'Rourke and Turner, 1981). This
may be due to rock mass characteristics which result in steeper limit angles under U.S.
conditions than those observed in Britain. As a consequence, the subsidence profile under
U.S. conditions should generally be sharper and narrower than that predicted using the
SEH methods. However, using profile functions would not necessarily provide a better
estimate of the subsidence profile unless site - specific experience in selection of input
parameters is available.
PR -14 _10- 03/14