8. Design of Coastal Structures
287
Section modulus Z' = 597 cm3
Case 2: In case of low tide level
Calculation
Calculating coefficient of active earth pressure
Ka = tan2(45 - 32/2) = 0.307
Kp = 3.25/2 = 1.625
(As Kp value will not be fully mobilized applying factor of safety 2 to Kp
value)
Calculating the active earth pressure
Pa (at point O) = 0
Pa (at point E) = (7' x (H„ - H) x Ka} = 25.75 kN/m2
Pa (at point A) = 25.75 + 10 = 35.75 kN/m