Figure 15.48 shows an infinite slope with H = 8.22 m, and the groundwater table coinciding with the ground surface. If there is seepage through the soil, determine the factor of safety against sliding along the plane AB. The soil properties are as follows: Gs = 2.73, e = 0.69, ( = 28°, (' = 18°, and c' = 47.8 kN/m2?

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Groundwater table 20° Direction of seepage ct 20°