Table 4: Material Properties used for Sliding Stability Analyses
Material
Total Unit Weight (pcf)
Friction Angle (?, degrees)
Earth Pressure Coefficients
Friction Factor
Active (Ka)
Passive (Kp)
(tanδ)
Sand
115
29°
0.3
3.25
0.55
Silt
120*
28°
0.71*
n/a
n/a
Water
62.5
n/a
n/a
n/a
n/a
RCC
150
n/a
n/a
n/a
n/a
* For silt, we adopted a total unit weight in the vertical direction of 120 pcf and an equivalent fluid pressure in the horizontal direction of 85 pcf in general accordance with recommendations in Ref. 3. The resulting Ka for 85pcf/120pcf is 0.71.
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