For the soldier pile and lagging system shown in the figure below, determine the adequacy
of the HP14x89 soldier pile for the soil conditions shown. Determine the minimum depth
of penetration, required section modulus and timber lagging thickness. Use a safety factor
of 1.5 on the passive soil resistance. Assume the soldier pile is 50 ksi steel and has a
section modulus of 131 in3. The timber lagging has an allowable bending stress of 1,500
psi. Show all your work for each step.
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