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WorksheetsDay 36-Oct 25-worksheet-PWD-Foundation engineering part 2
Total questions: 15
Worksheet time: 9mins
In Swedish Slip Circle method, the slip arc chosen as the critical surface is the one having —
Maximum radius
Maximum cohesion
Minimum factor of safety
Maximum shear
When Taylor’s Stability Number increases, the factor of safety —
Increases
Decreases
Becomes 1
Becomes independent
Active earth pressure occurs when a retaining wall —
Moves toward the backfill
Moves away from the backfill
Tilts forward
Remains at rest
For piles in sand, unit skin resistance is calculated using —
Nc*γ*B
k*σv*tanδ
σv / δ
Nc*σh
In a closely spaced pile group, the group efficiency ηg is —
> 1
Always 1
< 1
Infinite
Punching shear failure in footings generally occurs in —
Dense sand at shallow depth
Medium clay
Loose sand or soft clay at deeper depth
Rocky soil
Friction circle becomes a point for φ = 1 soils.
True
False
Passive pressure develops when the wall moves away from the soil.
True
False
Assertion (A): Negative skin friction acts upward along the pile. Reason (R): It occurs when the surrounding soil settles more than the pile.
A true, R true, R correct explanation
A true, R true, but R not explanation
A true, R false
A false, R true
In Taylor’s stability chart, Sn = 0.261 corresponds to a slope of (a) degrees.
For concrete piles δ = (a) Φ (in sand).
Punching shear shows no visible bulging.
True
False
Skempton’s Nc for a strip footing in pure clay when D/B = 0 is (a) .
A retaining wall supports 4 m dry cohesionless soil, γ = 18 kN/m³, φ = 30°. The total active earth pressure at base is —
(a)
Match the following
DF < 1
Face failure
DF = 1
Toe failure
DF >1
Base failure
