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Wednesday, February 1, 2017




Roll No­­­­­­­­­_________
SOIL AND FOUNDATION ENGG.
4th Exam /Civil/5109/May’07
                                                             
Duration 3 Hrs.
1.     Fill in the blanks
a.     Loess is _____ transported soil.
b.     In sands, shrinkage is ____ on drying.
c.      Surface area of sand particle is __
d.     Cohesion in sands is ________
e.      Clay particles can be seen with______
State true of false
f.       Soil in the field is subjected to direct sheer stress.
g.     In direct shear, specimen fails at the weakest plane.
h.     Sheer strength is given by S=C – ten
i.       Shear strength is given of cohesion less soil is determined by unconfined compression test.
j.       Vane shear test cannot be perfumed in the field.
Choose the correct one
1.     Which to the following piles are mostly used in India?
a.     Driven piles
b.     Bored piles
c.      Screwed piles
d.     Driven and cast in situ piles
2.     Which is not the element of well foundation?
a.     Staining
b.     Curb
c.      Bottom plug
d.     Driving shoe
3.     Contribution due to skin friction is maximum in
a.     Sands
b.     Soft clays
c.      Piles resting on rock
d.     None of the above
4.     The maximum size of plate for plate load test is  
a.     30cm2
b.     45cm2
c.      60cm2
d.     75 cm2
5.     The continuous soil deformation is highly plastic soils due to constant shearing is
a.     Creep
b.     Swelling
c.      Heaving
d.     Plastic flow
Section –B
Note: Attempt any ten questions.
2.      
a.     Explain ‘tilt’ in sinking of wells.
b.     What are under reamed piles?
c.      Define recovery ratio ad area ratio
d.     What are the drainage conditions for shear tests?
e.      Compare an isobar and pressure bulb.
f.       What is net safe B.C and gross safe bearing capacity?
g.     In which soils, vibratos are useful?
h.     What are the disadvantages of vane shear tests?
i.       What is soil profile? Compare sand with clay (give any five points )
j.       Compare sand with clay (give any five points)
k.     Why Darcy’s law is applicable for laminar flows only?
l.       Define seepage velocity
Section-C
Note : Attempt any three questions.
3.     A soil has a porosity o 40% the specific gravity of soil solids 2.65 and a water content of 12% determine the weight of water required to be added to 100 cc of the soil for full saturation.
4.     A soil sample of 10 cm length was tested in a variable head permeameter. The total head of water in the burette is 0.1 times of the soil sample, then calculate the co-efficient of permeability.
5.       
a.     What are effective and neutral stresses?
b.     Explain the concept of effective stress in detail and its importance in engg. Problems
6.       
a.     Give the concept of shear strength
b.     Explain with examples shear failure in soils.
c.      What is degree of compaction? How it can be controlled ?







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