Annamalai University December 2014 Question Paper B.Sc Construction Management : Soil Science

Annamalai University december 2014 question paper
B.Sc. DEGREE EXAMINATION December 2014
(CONSTRUCTION MANAGEMENT)
(FOURTH SEMESTER)
410: SOIL SCIENCE
Time: Three hours Maximum: 75 marks
 Answer ONE FULL question from each UNIT (5 × 15 = 75)
UNIT-I
1. Describe briefly the origin of soils and bring out the factors which control
their formation.
(OR)
2. Give reasons for determining the grain-size distribution of a soil mass. Why
is the study generally confined to coarse-grained soils?
UNIT-II
3. Explain the field and laboratory method of determination of co-efficient of
permeability.
(OR)
4. What constitutes a flow net? State any four methods of obtaining flow net in
any given case?
UNIT-III
5. Discuss the essential differences between Boussinesq’s and Westergaard’s
theories. For which condition do both these theories yield approximately the
same value of vertical stress?
(OR)
6. A circular area of 7.5m in dia. on the ground surface carries a uniformly
distributed load 3kN/m2. Find the intensity of vertical pressure below the
centre of the loaded area at a depth of 6m below the ground surface. Use
Boussinesq analysis.
UNIT-IV
7. List out the various factors affecting compaction. Explain in detail.
(OR)
8. How do you estimate the field “e-p curve” of an over-consolidated clay?
UNIT-V
9. Define critical void ratio. Explain the shear behaviour of a soil whose void
ratio is less than the critical void ratio.
(OR)
10. Discuss atleast three factors which govern the shear strength of
cohesionless soils.
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