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WorksheetsDay 34-Oct 23-worksheet-PWD-Compaction & consolidation
Total questions: 15
Worksheet time: 10mins
Maximum vertical stress on a vertical plane due to point load occurs at
30°
39°15′
45°
60°
The contact pressure for rigid footing on cohesive soil is
Max. at centre
Uniform
Max. at edges
Zero at centre
Compaction reduces:
Density
Permeability
Shear strength
Stability
In heavy compaction test, the hammer weight is
2.5 kg
3.5 kg
4.9 kg
3 kg
The time-dependent reduction of volume in saturated soil is called
(a)
Degree of consolidation is U = 90% when Tv ≈
0.121
0.196
0.287
0.848
Consolidation takes place due to expulsion of air from voids.
True
False
Relative compaction is the ratio of field dry density to maximum dry density.
True
False
The moisture content at which maximum dry density is achieved is called (a) .
The compaction curve corresponding to 100% saturation is the (a) curve.
Modified Proctor test delivers approximately 4.55 times the energy of Standard Proctor test.Is this statement true?
(a)
Over-consolidated soils have OCR (a)
Secondary consolidation is mainly due to (a) adjustment in soil structure.
A clay layer is 2.0 m thick and drains on both top and bottom surfaces (double drainage). If the coefficient of consolidation is Cv = 0.010 m²/day, find the time for 50% consolidation.
(a)
A 20 mm thick oedometer specimen with double drainage reached 50% consolidation in 5 minutes. Find Cv in m²/day.
(a)
