Environmental Engineering Reference
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of 60 to the horizontal and a maximum height of 35 m. The
slope has been protected from infiltration of surface water
by a layer of soil cement and lime plaster which is locally
referred to as “chunam” plaster. Small but dangerous failures
have occurred periodically at the crest of the cut slope. This
condition prompted a detailed investigation.
A cross section of the cut slope (i.e., A - A ), as illustrated in
Fig. 12.91, was analyzed. The stratigraphy consists primarily
of weathered granite. A 4-5-m layer of granitic colluvium
was underlain by a 10-m layer of completely to highly
2.4
2.2
30.5 m
g t = 15.7 kN/m 3
φ′ = 25 °
φ
2.0
b = 20
°
c
= 0 kPa
1.8
1.6
1.4
1.2
1.0
0.8
0
5
10
15
20
25
Cohesion intercept, kPa
0 0 0 0 0 0 0 0
Matric suction ( u a - u w ), kPa
Figure 12.91 Cross
section used for
stability analysis
in
Figure 12.89 Factor of safety versus matric suction for simple
slope.
example 1.
Figure 12.90 Site plan for slope stability example 1.
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