A natural slope is shown in Figure 5.41. It contains two soil strata. The slope configuration and the soil characteristics are shown in the figure. A potential toe circle with radius of 70.0 m passes the coordinate of (65m, 30m). The toe is at the origin (0, 0).

• Determine the average cohesion, friction angle, and unit weight of the slope and foundation soils.
• Determine the factor of safety of the slope along the assumed failure circle.
• Determine the minimum factor of safety of the slope, using Taylor’s chart.

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(65m, 30m) Clayey sand Ya = 18.0 kN/m3 c', = 20 kN/m? O' = 38° H = 18 m H = 30 m Sandy clay V2= 19.5 kN/m3 c'2 = 60 kN/m? O'2 = 15° 40° (0, 0) (65m, 30m) Clayey sand Ya = 18.0 kN/m3 c', = 20 kN/m? O' = 38° H = 18 m H = 30 m Sandy clay V2= 19.5 kN/m3 c'2 = 60 kN/m? O'2 = 15° 40° (0, 0)

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