= 10.5 Refer to Figure 10.8a. For the braced cut, given H = 6m; H, = 2.5 m; y, 16.5 kN/m²; angle of friction of sand, o = 35°; H = 3.5 m; y = 17.5 kN/m²; and unconfined compression strength of clay layer, q = 62 kN/m². a. Estimate the average cohesion (Ca) and average unit weight (y) for the con- struction of the earth-pressure envelope. b. Plot the earth-pressure envelope. Figure P10.3 3.5 m 1 m A Sand y= 18 kN/m³ 2 m '= 38° c'=0 B 2 m C 1.5 m H H Sand Ys Clay (a) Figure 10.8 Layered soils in braced cuts H (b) Clay Y1, C1 Clay Y2, C2 Clay Yn Cn