Figure below shows the zone of capillary rise within a clay layer above the grou
ID: 155184 • Letter: F
Question
Figure below shows the zone of capillary rise within a clay layer above the ground water table. If the degree of saturation in the capillary zone is 40%, calculate and plot the variation of total stress, pore water pressure, and effective stress with depth
Figure below shows the zone of capillary rise within a clay layer above the ground water table. If the degree of saturation in the capillary zone is 40%, calculate and plot the variation of total stress, pore water pressure, and effective stress with depthExplanation / Answer
Effective stress = (Height of thc soil column) x y', where y' equals the submerged unit weight
of soil.
= 8 x 2.73 = 21.84
u = HA x y' = pore water pressure = 18 x 2.73 = 49.14
Total stress = Hyw + (Ha -H) Yws
where total stress at the elevation of point A
yw = unit weight of water
Ysat = saturated unit weight of the soil
H = height of water table from the top of the soil column
HA = distance between point A and the water table
Hence Total stress = 34 x 0.89 + (18 - 10) x 2.73 = 30.26 + 21.84 = 52.1
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