A 5 m wide braced excavation is made in a saturated clay,as shown in Figure P19.1, with the following properties:c = 20 kN/m², o = 0, and y = 18.5

kN/m³. The struts are spaced at 5 m center to center in plan. a. Determine the strut forces. b. Determine the section modulus of the sheet pile required,assuming ơ al170 MN/m?. c. Determine the maximum moment for the wales at levels ers B and C.