Fig. Ex. 20.18a gives the section of a long braced cut. The sides are supported by steel sheet pile walls with struts and wales. The soil excavated at the site is stiff clay with the following properties
c=800 lb / ft ^{2}, \phi=0, \gamma=115 lb / ft ^{3}Determine: (a) The earth pressure distribution envelope.
(b) Strut loads.
(c) The maximum moment of the sheet pile section.
The struts are placed 12 ft apart center to center horizontally.