Question

The average effective overburden stress of a loessial soil deposit is 1565 lb/ft^2. An undisturbed specimen of this soil obtained from the middle layer was soaked for 24 hours and subjected to an oedometer test, where the preconsolidation pressure was determined as 2090.0 lb/ft^2. is the in situ soil normally consolidated or overconsolidated?

Answer #1

SITUATION 2: EFFECTIVE STRESS
An engineer investigates a granular soil deposit, 4 meters
thick, overlaying a 5 meter thick clay. The
water table is present between the interface of the granular soil
and the clay. The moist unit weight
of the sand is 15.6 kN/m3
, while the clay has a saturated unit weight of 17.8 kN/m3
a.) What is the vertical effective stress at the bottom of the
clay?
b.) If the water table rises to the level of...

The net stress increase due to a building at the middle of a 6
ft normally consolidated clay layer is 400 psf. The compression
index of the soil is 0.6 and its void ratio is 1.3. If the primary
consolidation settlement is 2.34 inch, the initial effective
consolidation stress (psf) is most nearly equal to
a) 1400 b) 1200 c) 1000 d) 1600
Please show all steps

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