Civil Engineering Reference
In-Depth Information
(a)
Tension cracks
(b)
Shovel
operating
at toe
1.2
2050
Slide surfaces
2000
1.0
Failure on
pit crest
1950
0.8
1900
1850
Sandstone
0.6
Ta l u s
1800
0.4
1750
Siltstone
0
100 m
26
5
10
15
20
April
March 1975
Date
(c)
30
Acceleration
6
4
2
Failure
0
Detail
JJASO
ND J FMAM
J
1975
1976
Time (months)
(d)
0.5
0.4
0.3
0.2
0.1
0.05
Failure
0.02
0.01
10
20
30
40
50
60
Time (days)
Figure 13.6
Movement monitoring at open pit coal mine: (a) cross-section of pit and hillside showing geology
and extent of slope failure; (b) regressive slope movement when mining at 1840 m level; (c) slope movement
over 13 months leading to slope failure; (d) slope velocity over two months prior to failure (Wyllie and
Munn, 1979).
