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9.22 A6mhigh retaining wall having a smooth vertical
back face retains a layered horizontal backfil
.
Top 3 m thick layer of the backfill is sand having
an angle of internal friction, 0 = 30° while the
bottom layer is 3 m thick clay with cohesion,
= 20 kPa. Assume unit weight for both sand
and clay as 18 kN/m. The total active earth
pressure per unit length of the wall (in kN/m) is
(a) 150
(b) 216
(C) 156
(d) 196
(2015: 2 Marks, Set-II]


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