2002-05-13_PERMIT FILE - C1981041 ‎(7)‎

• Permit No: C1981041
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: Colorado Ute Transmission Line Subsidence Prediction
• Section_Exhibit Name: TAB 20 Appendix 20-5
• Media Type: D
• Archive: No

• •
RECTANGULAR COLLAPSE
H I H_ h(loe)
--I ~ %.S
-f ~p L
WEDGE COLLAPSE
H \
~ '
;n~ ~ --~~ i L/
~ MAX. HEIGH7
Of COLLAPSE
(H~ 15
H, 2ti(10°t(expressed
%S as multiple of
exlrscted
{hickness h)
10
3h uoot
H'•°S
5'= Percen{ .Sall a V~ ~~ ~ 100)
Vo
Voa original volume of unbroken siratz
Vc . volume of colispsnd roof beds
FIGURE 2a Diagram showing notation for caleu.lating
maximwn height of collapse (H) in
relation to geometry of collapse.
(modified from Piggott 8 Eynon, 1917)
S
C~
Aa.nge of percent
Swell for
Co:I Messurt SGrit1
~-
Obstrvad maximum height
of toll>.pst In the mint
1 I
~ I I
y, !~ I
,fir I
20% ~0% 40Y.
PERCENT SWEII y°5
(eXpressecl as'a percerf[..ge)
FIGURE 2b. Graph showing variation 1n maximum
height of collapse for different modes
of failure and bulking factors,
(modified from Piggott b Eynon, 1917)

w- P -.r-
CONICAL COLLAPSE