2008-01-16_APPLICATION CORRESPONDENCE - C2008086 ‎(2)‎

• Permit No: C2008086
• IBM Index Class Name: Application Correspondence
• Doc Date: 1/16/2008
• Doc Name: Preliminary Draft Environmental Impact Statement/Subsidence Figures 1 to 15
• Media Type: D
• Archive: No

RECTANGULAR COLLAPSE {Large area panels)
~ i _ h{100)
H
__ ; H- %S
~ ~ p ~r Li°I
H ~ ~~'
~ _ , '" ,.'
-a~~ L
~ ~ P ~-~
CONICAL COLLAPSE
H
H _ 3h(100)
%S
S = PERCENT SWELL = V Vo ° (100)
Vo = ORIGINAL VOLUME OF UNBROKEN ROOF STRATA
Vc = VOLUME OF COLLAPSED ROOF STRATA
Diagram showing notation for calculating
maximum height of collapse (H) in
relation to geometry of collapse.
H = 2h 100)
°i° s
(Four-way intersections)
30-
rti
.-.
= 25-
W (~
to w
a =
J z 20-
tO
V O
LL ~
0
~ J 15-
t~
w~
_ ~ 10-
~ ~
Q p^C 5
li
W
v
o-
-c•
..:....:.........:... ..:....:....:....:.... . ........:....:.... ...:....:....i....t--. ..;....;....;...
..j.... ~....~.....j... .j....}....j.... ~.... .... ~.... {....iy....j.... ... j.... ~.... ~....~.... ..y....j.... j...

ANC.~~~© P~~iGti~T•••

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~
~ ....j....j....j....iL..
~ O sentecl
m mum ~18~~~1

"o~
coilapse'~ri' ~....i........
'e~ rri~ne.
~---. ~~ ::j ........:....:....~..~

......~....~.... ...

ins ....y....~....~....

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.~
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.
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:
i .~....y....y.......

~i
+
- .
- ~
- -
--
-- --
--~
-

..i....~ ........ j.... i....;-... ..>....
0 10% 20% 30% 40% 50%
PERCENT SWELL %S
Graph showing variation in maximum
height of collapse for different modes
of failure and percent swell of rock.
(modified from Piggott & Eynon, 1977)
WEDGE COLLAPSE (Long narrow entries)