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Geotechnical Engineering Question Paper - Dec 17 - Civil Engineering (Semester 3) - Pune University (PU)
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Geotechnical Engineering - Dec 17
Civil Engineering (Semester 3)
Total marks: 50
Total time: 2 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
What are the major soil deposits of India ? Explain any two
in brief.
(6 marks)
00
1.b.
State how field permeability is determined. Explain any one
method.
(6 marks)
00
Or
1(a)
Define shrinkage limit. A shrinkage limit test gave the following
observations. Determine the shrinkage limit. Volume of dry
pat = 29.30 ml, Mass of dry pat = 48.32 gm, Initial volume
(wet) = 43.50 ml, Initial mass (wet) = 66.66 gm, Find the
shrinkage limit.
(6 marks)
00
2.b.
Explain flow net construction for seepage below earthen dam.
(6 marks)
00
3.a.
What are the advantages of triaxial compression test in comparison
with the direct Shear test ?
(6 marks)
00
3.b.
Write a short note on ‘‘Proctor needle in field compaction
control.’’
(6 marks)
00
Or
4.a.
Define sensitivity and thixotropy. [7]
A cohesive soil has an angle of shearing resistance of 15º &
cohesion of 35 kN/m2. If a specimen of this soil is subjected
to a triaxial compression test, find the value of lateral pressure
in the cell for failure to occur at a total axial stress of
300 kN/m2
(7 marks)
00
4.b.
Write the equations for stresses in soil for point loading by
Boussinesq’s and Westergaard’s theory and assumptions in these
theories.
(6 marks)
00
5.a.
Explain Coulomb’s Wedge theory for determination of earth
pressure
(6 marks)
00
5.b.
A vertical retaining wall retains the level backfill of sand. The
water level stands H1
metres below the top of the backfill.
Draw the pressure distribution diagram for the active conditions
(6 marks)
00
Or
6.a.
State the assumptions made in Rankine’s Earth Pressure theory
and derive the relation for earth pressure at rest condition.
(6 marks)
00
6.b.
Explain active state of earth pressure condition.
A wall 6 m high has a smooth vertical back and it retains
a non-cohesive level backfill with ? = 18.0 kN/m3, = 30º.
Determine the total lateral pressure in active state.
(6 marks)
00
7.a.
What is Stabilization-solidification ? How is chemical
decontamination carried out ?
(6 marks)
00
7.b.
What is infinite and Finite slopes ? Give examples.
Explain how the stability charts are used in the design of
slopes.
(7 marks)
00
Or
8.a
Derive the critical height of slope for a verical excavation in
a c- soil. What is the critical height of vertical excavation
that can be made without any lateral support in a cohesive
soil having the following properties-? ? = 18 kN/m3, c = 14 kN/m2,
= 12º
(6 marks)
00
8.b.
Write a short note on subsurface contamination and contaminant
transport.
(7 marks)
00
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