A bridge abutment is constructed of cantilever sheet piling, retains a soil height of 12.0 m. and a depth of 4.0m. at th

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A bridge abutment is constructed of cantilever sheet piling,
retains a soil height of 12.0 m. and a depth of 4.0m. at the
passive side. The soil is sandy clay with a unit weight of 18.5 kN
cu.m . and has an angle of internal friction of 32 degrees.
a. Compute the active stress at the base Pa=? (in kPa)
b. Compute the passive stress at the base Pp=? (in kN)
c. Compute the active force Fa=? (in kN)
d. Compute the passive force Fp =? (in kN)
e. What is the factor of safety of the cantilever sheet
piling?
f. Is the structure safe if the specification requires F.S. =
1.50?
g. If not, what must be the required depth of embedment ( d+h )
of the sheet pile?