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

(65 m, 30 m). The toe is at the origin (0, 0).

(1) Determine the average cohesion, friction angle, and unit weight of

the slope and foundation soils.

(2) Determine the factor of safety of the slope along the assumed fail-

ure circle.

(3) Determine the minimum factor of safety of the slope, using Taylor’s

chart (Figure 5.41).