Horizontal Total And Effective Stresses

A) A soll sample is known to be saturated and has a water content of
25.4%
. Assuming the soll grains have a specific gravity,
Gs
s

=2.65
, calculate the bulk unit welght and specific volume of the soll. [7 Marks] A stratum of clay at a site has a bulk unit weight,
y=18.5kN/m
3

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and the water table is 1.5 Horizontal Total And Effective Stresses
m
below ground level. Assuming a coefficient of earth pressure at rest,
K
0

=1.3
calculate the in situ vertical and horizontal total and effective stresses at the depth of
4 m.
[8 Marks] A saturated sample of soft clay was taken from the ground and placed in an oedometer. The initial water content of the sample was
34.5%
and the initial height was
20 mm
. The specific gravity of the clay is
2.74
. The sample was compressed one-dimensionally in the oedometer by adding increments of vertical effective stress, Horizontal Total And Effective Stresses
σ
v

‘. The observed changes in height at the end of each stage are given in Table Q2. Use the data in Table Q2 to plot a graph of voids ratio against
σ
v

and calculate the coefficient of compression, Cc. [20 Marks] Table Q2 Horizontal Total And Effective Stresses

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