Refer to Figure 15.10b, which shows a braced cut in clay. Given: H = 25 ft, H1-5 ft, c1%=2125 lb/ft2, y1=111 lb/ft3, H2-10 ft, c2=1565 lb/ft2, y2=107 Ib/ft3, H3 = 10 ft, c3 = 1670 Ib/ft2, and y3 = 109 lb/ft3. a. Determine the average cohesion (cav) and average unit weight (gav) for the construction of the earth-pressure envelope. b. Plot the earth-pressure envelope. Reference: Clay H Clay Y2, C2 H2 H. Clay Ya Cn Activate Windows (b) Go to Settings to activate Wind