REP06340

• Permit No: C1981033
• IBM Index Class Name: Report
• Doc Date: 4/22/1982
• Doc Name: 1982 STABILITY ANALYSIS OF PORTAL & ACCESS ROAD AREAS
• From: ROCKY MOUNTAIN GEOTECHNICAL
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

FEAR `1I NE ^:0. 3

'

' Conditions Analyzed:
Colluvium - c = 210
Bedrock (other than
shear strength
Seepage condition -
psf, 3 = 16° (Residual strength)
massive sandstone) - c = 4000 psf., $ = 33° (Typical overall triaxix:
performance for interbedded siltstone, sandstone, and shale)
no subsurface seepage.
X Coord. Y Coord.
Slope (Et.) (Et.) R (f t.) F SFI(°)
Section A:
Existing Condition:
Above portal area S1 320 6316 161 0.620 31.28
W1 0.634 30.77
Below bench area 52 540 6246 239 0.596 32.37
W2 0.548 34.48
' Future condition:
20 ft. bench with 53 320 6316 161 0.553 36.98
1:1 backslope W3 0.560 33.65
' 40 ft. bench with S4 388 6330 196 0.662 39.45
1:1 backslope W4 0.579 37.21
t 40 ft. bench with
1:1 backslope-
below bench WS 0.612 31.40
Section B:
Existing condition:
' Above portal area S1 318 6498 328 2.141 24.32
S2 326 6488 333 2.148 24.84
W1 1.453 45.04
W2 4.925 33.47
Below bench area S3 590 6266 252 0.812 24.64
W3 0.985 23.51
Future condition:
' Above portal area 54 280 6278 105 2.614 11.41
SS 328 6492 337 2.138 24.84
W4 6.001 38.72
' Below bench area S6 492 6268 183 0.804 29.23
(reclaimed) S7 590 6266 252 0.812 24.64
' Section C:
Existing condition:
Above portal area S1 390 6328 182 0.819 29.04
W1 0.803 29.01
t Below bench area 52 450 6220 127 0.876 24.13
W2 1.429 26.23
S3 580 6288 256 0.876 23.30
' W3 0.698 23.39
W4 1.423 16.79
' Future condition:
Above
ortal area
S4
390
6328
182
0.913
26.23
p W5 0.811 28.89
Below bench area SS 450 6220 127 0.838 25.26
(reclaimed) W6 1.321 -27.45 - - -
' S6 580 6288 256 0.876 23.30
W7 0.894 23.32
' Wg 1.417 16.88