Civil Engineering Reference
In-Depth Information
N-5500
N-5500
P5
N-5000
N-5000
West fault
N-4500
N-4500
Moderate
shear zone
N-4000
N-4000
P3
N-3500
N-3500
N-3000
N-3000
Intense shear
zone
Figure 10.15
Plan of Chuquicamata
open pit showing shear zone (modeled as
a time-dependent material), and Profiles
P3 and P5.
N-2500
N-2500
here demonstrates that the time-dependent beha-
vior of the west wall can be reasonably sim-
ulated when the sheared zone is represented
by a two-component power-law creep model
combined with a Mohr-Coulomb elasto-plastic
model. Measured slope movements and changes
in displacement rates over a period of six years are
compared to model predictions for two profiles
(see Figure 10.16).
Profile P3 is an east-west section located at
mine coordinate N3600; it is a good section for
calibration of behavior of the west wall for two
reasons. First, the location of P3 is near the
middle of the west wall and therefore is rep-
resentative of conditions in this wall. Second,
its orientation is perpendicular to the west wall
and the geology, allowing representative two-
dimensional analysis. Profile P5 is a good section
for calibration because mining with steep slope
angles within the shear zone led to a slope fail-
ure in February 2002. Both profiles have good
historical information about slope movement
from prism monitoring, as described in the next
section.
Records of slope movement were available
from monitoring records. The prism locations for
