Question
Asked Feb 4, 2019
524 views

subject: Geotechnical Engineering

book: principle of foundation engineering - Braja M Das

FIGURE P2.9
The soil profile at a site consists of 10 m of gravelly sand
underlain by a soft clay layer. The water table lies 1 m below
the ground level. The moist and saturated unit weights of the
gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively.
Due to some ongoing construction work, it is proposed to
lower the water table to 3 m below the ground level. What
will be the change in the effective stress on top of the soft
clay layer?
2.10
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FIGURE P2.9 The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer? 2.10

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Expert Answer

Step 1

Determine the effective stress at the top of the clay layer before lowering the water table using the relation

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Step 2

Determine the effective stress at the top of the clay layer after lowering the water table using the relation

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Step 3

Now, determine the change ...

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