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WorksheetsDay 35-Oct 24-worksheet-PWD-Foundation engineering part 1
Total questions: 15
Worksheet time: 8mins
In site investigation, significant depth is generally taken as the depth corresponding to what percentage of the vertical stress?
5%
10%
20%
25%
Which boring method is NOT suitable for gravelly soil due to circulation loss of drilling mud?
Percussion
Auger boring
Rotary boring
None
The SPT sampler collects soil samples which are:
Undisturbed
Completely undisturbed
Highly disturbed
Partially undisturbed
The area ratio (AR) of a thin-walled undisturbed sampler should be:
> 30%
< 10%
< 25%
15–20%
Toe failure in slopes is most common when:
Slope is flat with weak soil below
Slope is steep and homogeneous
Soil at toe is strong
Slip surface non-circular
Critical void ratio refers to:
Volume ratio at failure
Void ratio at zero shear
Void ratio when loose and dense sand reach same volume after shear
Ratio of dry and moist voids
In vane shear test, drainage condition is controlled and therefore Mohr circle can be drawn.
True
False
Assertion (A): In SCPT, Dutch cone gives point resistance of soil. Reason (R): Cone is driven dynamically using repeated blows of a hammer.
A true, R true and R is correct explanation
A true, R true but R not correct explanation
A true, R false
A false, R true
In Mohr–Coulomb failure criterion, the shear strength S = (a) .
In unconfined compression test, undrained shear strength Cu = (a) .
In infinite slopes, the failure surface is (a) to the slope face.
Depth factor (DF) = 1 indicates (a) failure in finite slopes.
An SPT test in granular soil gave raw N = 32 at a depth where σ₀ = 200 kN/m². Corrected N = 15 + 0.5(N − 15). Find the corrected N-value.
(a)
A UU triaxial test on clay fails at deviator stress = 180 kN/m² under confining pressure 50 kN/m². Find Cu
(a)
A cohesive slope has c = 25 kN/m² and τm=8 kN/m². Find the factor of safety with respect to shear strength.
(a)
