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Slope Stability Example with Pore Pressures

Slope Stability Example - Non-homogeneous Stratigraphy


The soil parameters of this problem, the external loadings and the piezometric surface are shown in Tables 1, 1 and 3 respectively. The effect of the tension crack is to be ignored.  The factor of safety and its corresponding critical non-circular failure surface is required.


Table 1: Material Properties


c΄ (kN/m2)

φ΄ (deg.)

γ (kN/m3)

Soil 1

28.5

20.0

18.84

Soil 2


10.0

18.84


Table 2: External Loading

X (m)

Y (m)

Normal Stress (kN/m2)

23.00

27.75

20.00

43.00

27.75

20.00

70.00

40.00

20.00

80.00

40.00

40.00


Table 3: Data for Piezometric surface

Xc (m)

Yc (m)

20.00

27.75

43.00

27.75

49.00

29.8

60.00

34.00

66.00

35.80

74.00

37.60

80.00

38.40

84.00

38.40


Figure 1- Model of the problem


Method: SPENCER

Factor of Safety

Normal model

0.693

Reversed model

0.693

Note: Referee Factor of Safety = 0.78 [Giam]

Mean Non-circular FOS (20 samples) = 0.808

Referee GLE Factor of Safety = 0.6878 [Slope 2000]


Figure 2– SPENCER - Normal model solution


Figure 3– SPENCER - Reversed model solution


 


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