Weight of wet soil in kgs 1.8 1.94 2.0 2.04 2.03
(06 Marks)
(06 Marks)
Plot the compaction curve and get maximum dry density and OMC. Also plot ZAV line.
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Important Note?
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Fourth Semester B.E. Degree Examination, Dec. RAJA' 020
Basic Geotechnicai Engineering
Time: 3 hrs. Max. Marks: 100
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Note: Answer any FIVE full questions, choosing ONE full question from each module.Module-1
1 a. With the help of 3-phase diagram define: void ratio, porosity, water content and degree of
saturation. (08 Marks)
b. Derive from first principles, the following phase relation:
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=? n
a
)G.y?,
d
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1 WG(06 Marks)
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c. With the help of particle size distribution curve explain: well graded soil, uniformly graded
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soil and gap graded soil. (06 Marks)? -?
OR
2 a. With a neat sketch, explain the salient features of a plasticity chart. (08 Marks)
b. The natural dry density of a soil deposit was found to be I 7.5kN/m
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3. A sample of soil was
brought to the laboratory and the minimum and maximum dry densities were found as
16kN/rn
3
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and 1901/mi respectively. Calculate the density index for the soil deposit.o (06 Marks)
c. How many cubic meters of soil can be formed with a void ratio of 0.5 from 100 cubic meters
of soil having void ratio of 0.7. (06 Marks)
0
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81
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(08 Marks)
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Module-3O a-2
5 a. Derive an expression to obtain coefficient of permeability under falling head condition.
(06 Marks)
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b. Explain with a neat sketch the method of locating the phreatic line in a homogeneous earthdarn with horizontal filter. (06 Marks)
c.
Calculate the coefficient of permeability of a soil sample, 6 ems in height and 50cm
2
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incross-sectional area, if a quantity of water equal to 430m1 passed down in 10 minutes, under
an effective constant head of 40cms. On oven drying the test specimen has a mass of
498 gins. Taking the specific gravity of soil solids as 2.65, calculate the seepage velocity of
water during the test.
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(08 Marks)1 oft
Take G = 2.75 and volume of mould as 995 c.c.
OR
4 a. Describe the three principal clay minerals. (08 Marks)
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b. Explain electrical diffuse double layer and adsorbed water. (06 Marks)c. What are the factors which affect compaction? (06 Marks)
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Module-2
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3 a. List and explain various soil structures.b. What is the effect of compaction on soil properties?
c. Following are the results of a standard proctor compaction test on a soil:
Water content, % 8.5 12.2 13.75 15.5 18.20
Weight of wet soil in kgs 1.8 1.94 2.0 2.04 2.03
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(06 Marks)(06 Marks)
Plot the compaction curve and get maximum dry density and OMC. Also plot ZAV line.
Important Note
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Fourth Semester B.E. Degree Examination, Dec. RAJA' 020Basic Geotechnicai Engineering
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
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1 a. With the help of 3-phase diagram define: void ratio, porosity, water content and degree ofsaturation. (08 Marks)
b. Derive from first principles, the following phase relation:
=
? n
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a)G.y?,
d
1 WG
(06 Marks)
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7c. With the help of particle size distribution curve explain: well graded soil, uniformly graded
soil and gap graded soil. (06 Marks)
? -?
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OR2 a. With a neat sketch, explain the salient features of a plasticity chart. (08 Marks)
b. The natural dry density of a soil deposit was found to be I 7.5kN/m
3
. A sample of soil was
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brought to the laboratory and the minimum and maximum dry densities were found as16kN/rn
3
and 1901/mi respectively. Calculate the density index for the soil deposit.
o (06 Marks)
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c. How many cubic meters of soil can be formed with a void ratio of 0.5 from 100 cubic metersof soil having void ratio of 0.7. (06 Marks)
0
8
1
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6
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(08 Marks)v:
F.5
Q
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47-
c
Module-3
O a-2
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5 a. Derive an expression to obtain coefficient of permeability under falling head condition.(06 Marks)
r-4
b. Explain with a neat sketch the method of locating the phreatic line in a homogeneous earth
darn with horizontal filter. (06 Marks)
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c.Calculate the coefficient of permeability of a soil sample, 6 ems in height and 50cm
2
in
cross-sectional area, if a quantity of water equal to 430m1 passed down in 10 minutes, under
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an effective constant head of 40cms. On oven drying the test specimen has a mass of498 gins. Taking the specific gravity of soil solids as 2.65, calculate the seepage velocity of
water during the test.
(08 Marks)
1 oft
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Take G = 2.75 and volume of mould as 995 c.c.OR
4 a. Describe the three principal clay minerals. (08 Marks)
b. Explain electrical diffuse double layer and adsorbed water. (06 Marks)
c. What are the factors which affect compaction? (06 Marks)
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OR6 a. State the characteristics and uses of flownets. (08 Man
b. Explain the terms superficial velocity and seepage velocity. Derive the relationship betwee,
them. (06 Marks)
c. If during a Variable head permeability test on a soil sample, equal time intervals are noted
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for drops of head from h[
to h
2
and again from h2 to h
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3. Find the relationship between h
1
,
and h
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3. (06 Marks)
Module-4
7 a. Explain mass-spring analogy of consolidation of soils. (06 Marks)
b. Explain Casagrande's method of determination of pre consolidation pressure. (06 Marks)
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c. The time to reach 40% consolidation of a two way drained saturated clay sample of 10mmthick in the laboratory is 40 secs. Determine the time required for 60% consolidation of the
same soil 12m thick on an impervious layer subjected to same loading conditions. (08 Marks)
OR
8 a. Explain square root of time fitting method for determination of coefficient of consolidation.
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(06 Marks)b. Explain under consolidated, normally consolidated and over consolidated soils. (06 Marks
c. A layer of clay..8m thick underlies a proposed new building. The existing overburden
pressure at the centre of clay layer is 290kN1 m
2
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and the load due to new building increasesthe pressure
.
by 100kN/m
2
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. Cc = 0.45, W = 50%, G = 2.71. Estimate consolidationsettlement.
(08 Marks)
Module-5
9 a. Explain Mohr-Coulomb theory of shear strength. (06 Marks)
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b. Explain the advantages and disadvantages of direct shear test over triaxial shear test.(06 Marks)
c. An unconfined compression test was conducted on an undisturbed sample of clay. The
sample had a diameter of 38mm and was 80mm long. The load at failure measured as 30N
and the axial deformation of the sample of failure was 12mm. Determine the unconfined
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compressive strength and undrained shear strength of clay. (08 Marks)OR
10 a. Explain sensitivity and thixotropy.
b. Explain vane shear test with a neat sketch.
c. The triaxial tests carried'Out on soil samples gave the following results:
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Confining pressure,,,kNim2
50 100 150
Deviator stress, kN/m
2
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76 132 186Pore water pressure , kNim
2
35 59 83
(06 Marks),
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(06 Marks)Plot Mohr's circle and obtain effective shear parameters. (08 Marks)
2 of 2
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