**Soil Mechanics CE2251 Important Questions May June Anna Univ Exams 2013**

**Soil Mechanics 4th sem Civil Questions 2013**

**IMPORTANT QUESTIONS MAY OR MAY NOT BE ASKED FOR UNIVERSITY EXAMINATION**

Anna
University May/June 2013 Examinations

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Questions for Exams

CE2251 - SOIL MECHANICS

1. The mass of wet soil when compacted
in a mould was 19.55 kN. The water content of the soil was 16%. If the volume
of the mould was 0.95 m3. Determine (i) dry unit weight, (ii) Void ratio, (iii)
degree of saturation and (iv) percent air voids. Take G = 2.68

2.Sandy soil in a borrow pit has unit
weight of solids as 25.8 kN/m3, water content equal to 11% and bulk
unit weight equal
to 16.4 kN/m3.
How many cubic
meter of compacted fill could
be constructed of 3500 m3 of sand excavated from borrow pit, if required value of porosity in the compacted fill is 30%. Also calculate the
change in degree of saturation.

3.A soil has a bulk unit weight of
20.11 KN/m3 and water content of 15 percent. Calculate the water content
of the soil
partially dries to
a unit weight
of 19.42 KN/m3 and
the voids ratio
remains unchanged

4.Explain Standard Proctor Compaction
test with neat sketches.

5.Explain all the consistency limits
and indices.

6.Explain in
detail the procedure
for determination of
grain size distribution
of soil by
sieve analysis

7.The discharge of water collected
from a constant head permeameter in a period of 15 minutes is 500 ml. the internal diameter of the permeameter is 5 cm and the measured
difference in head between two
gauging points 15
cm vertically apart
is 40 cm.
calculate the coefficient
of permeability. If the dry
weight of the 15 cm long sample is 486 gm and the specific gravity of the solids is 2.65, calculate the seepage
velocity.

8. Explain in Detail About the methods of obtaining flow
nets

9. Explain the falling head
permeability test

10.Compute the total, effective and
pore pressure at a depth of 20 m below the bottom of a lake 6m deep.
The bottom of
lake consists of
soft clay with
a thickness of more
than 20 m.
the average water content of the
clay is 35% and specific gravity of the soil may be assumed to be 2.65

11.What are the applications of flow
net and explain briefly

12.Explain with a neat sketch the
Terzhaghi’s one dimensional consolidation theory

13.Explain the Newmark’s influence
chart in detail.

14. What are the various components of a
settlement? How are these estimated?

15. A stratum of clay with an average
liquid limit of 45% is 6m thick. Its surface is located at a depth of 8m below the ground surface. The natural
water content of the clay is 40% and the specific gravity is 2.7. Between ground surface and
clay, the subsoil consists of fine sand.
The water table is located at a depth of
4m below the ground surface. The average submerged unit weight of sand is 10.5 kN/m3 and unit weight of sand
above the water table is 17 kN/m3. The weight of the building that will be constructed on the
sand above clay increases the overburden pressure on the clay by 40 kN/m 2 . Estimate the
settlements of the building.

16.Explain the assumptions made by
Boussinesque in stress distribution on soils

17.Obtain the
relationship between the
principal stresses in
triaxial compression test
using Mohr-Coulomb failure theory

18.Explain with neat sketch Direct
Shear method of finding Shear Strength

19.Explain the direct shear test to
determine the shear strength of soil

20.Describe the triaxial shear test.
What are the advantages of triaxial shear test over the direct shear test?

21.Explain with neat sketches the
procedure of conducting direct shear test. Give its advantages over other methods of finding shear strength
of soil

22.Explain the
procedure to calculate
the factor of
safety of a
finite slope possessing
both cohesion and friction (c - Φ) by method of slices.

23.Explain with neat sketches the
Bishop’s method of stability analysis

24.What are different types of slope failures? Discuss
the various methods for improving the
stability of slopes

25.Explain the Swedish slip circle
method in detail.

26.Explain Taylor’s stability number
and its applicability.