Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2154003 Geotechnical Engineering I Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2154003 Date:27/11/2018
Subject Name:Geotechnical Engineering - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) A given cohesion less soil has emax = 0.85, emin = 0.5. In the field, the soil is
compacted to a mass density of 1800 kg/m
3
at water content of 8%. Take the
mass density of water as 1000 kg/m
3
and GS = 2.7. What is the value of
relative density, RD?
03
(b) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
04
(c) Prove the following using soil 3 phase diagram representation. (Any 3)
(1) ?? =
????
?? ?? (2) ?? =
(?? ?? +???? )?? ?? 1+??
(3) ?? ?? =
?? ??
?? ?? (1+?? )
(4) ?
?? = (1 ? ?? )?? ?? ?
??
07
Q.2 (a) As per the Indian Standard soil classification system, a sample of silty clay
with liquid limit of 75% and plasticity index of 45% is classified as? (Refer
to Figure 1)
03
(b) The results of sieve analysis of a soil are given below:
Total Wt.: 500 gm
IS sieve (mm) 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Mass Retained (gm)
0.08 0.81 1.67 2.15 9.09 132.45 310.3
Draw Particle Size Distribution curve on graph.
04
(c) By referring to Question 2 (b) above Calculate percentage of gravel, coarse
sand, Medium sand, fine sand, and fines (clay and silt). And Classify the
soil.
07
OR
(c) Explain the procedure of estimation of pre-consolidation stress using
Casagrande?s graphical method?
07
Q.3 (a) Draw a neat sketch for the consistency limits as proposed by Atterberg? 03
(b) A soil sample brought from the field was noted to have a volume of 40 cc
weight of 63 g. On oven drying, the weight of the sample was reduced to 55
g. The weight of the dry soil pat with paraffin wax coating was 60 g. The
volume of spilled out water due to immersion of pat was 40 cc. Calculate
the shrinkage limit and the specific gravity of solids? [Specific Gravity of
Wax = 0.83]
04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2154003 Date:27/11/2018
Subject Name:Geotechnical Engineering - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) A given cohesion less soil has emax = 0.85, emin = 0.5. In the field, the soil is
compacted to a mass density of 1800 kg/m
3
at water content of 8%. Take the
mass density of water as 1000 kg/m
3
and GS = 2.7. What is the value of
relative density, RD?
03
(b) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
04
(c) Prove the following using soil 3 phase diagram representation. (Any 3)
(1) ?? =
????
?? ?? (2) ?? =
(?? ?? +???? )?? ?? 1+??
(3) ?? ?? =
?? ??
?? ?? (1+?? )
(4) ?
?? = (1 ? ?? )?? ?? ?
??
07
Q.2 (a) As per the Indian Standard soil classification system, a sample of silty clay
with liquid limit of 75% and plasticity index of 45% is classified as? (Refer
to Figure 1)
03
(b) The results of sieve analysis of a soil are given below:
Total Wt.: 500 gm
IS sieve (mm) 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Mass Retained (gm)
0.08 0.81 1.67 2.15 9.09 132.45 310.3
Draw Particle Size Distribution curve on graph.
04
(c) By referring to Question 2 (b) above Calculate percentage of gravel, coarse
sand, Medium sand, fine sand, and fines (clay and silt). And Classify the
soil.
07
OR
(c) Explain the procedure of estimation of pre-consolidation stress using
Casagrande?s graphical method?
07
Q.3 (a) Draw a neat sketch for the consistency limits as proposed by Atterberg? 03
(b) A soil sample brought from the field was noted to have a volume of 40 cc
weight of 63 g. On oven drying, the weight of the sample was reduced to 55
g. The weight of the dry soil pat with paraffin wax coating was 60 g. The
volume of spilled out water due to immersion of pat was 40 cc. Calculate
the shrinkage limit and the specific gravity of solids? [Specific Gravity of
Wax = 0.83]
04
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(c) Liquid limit of Soil A is 38% , Soil B is 60% and Plastic limit of soil A is
25% and plastic limit is 30% then,
a) Which soil will be a better foundation material upon remoulding?
b) Which soil is more compressible?
c) Which Soil shows a higher rate of loss in shear strength upon increase
in water content?
07
OR
Q.3 (a) The compaction of an embankment is carried out in 300 mm thick lifts
(layers). The rammer used for compaction has the foot of area 0.05 m
2
. The
energy developed per drop of the rammer is 40 kg-m. Assuming 50 percent
more energy in each pass over the compacted area due to overlap, calculate
the number of passes to develop compactive energy equivalent to IS heavy
compaction for each layer ?
03
(b) Compare the compactive energy used in the IS heavy compaction test with
that of the IS light compaction test.
04
(c) Following data refers to a compaction test as per IS light Compaction.
Water Content
(%)
8.57 12.24 14.02 16.09 17.29 19.87
Wt. of wet sample (kg)
1.82 1.87 1.99 2.08 1.99 1.90
If the specific gravity of soil grains was 2.7, Plot the compaction curve and
obtain MDD and OMC with necessary detailed calculation.
07
Q.4 (a) What is the permeability of soil? How to determine permeability in
laboratory? What is the unit of Coefficient of permeability?
03
(b) In a falling head permeability test on a sample 12.2 cm high and 44.44 cm
2
in cross sectional area, the water level in a standpipe of 6.25 mm internal
diameter dropped from a height of 80 cm to 24.7 cm in 10 minutes. Find the
coefficient of permeability.
04
(c) Explain Casagrande?s Liquid limit determination method to determine
Liquid limit of Soil with neat sketch.
How you will find out liquid limit based on the test give suitable example
with graphical representation.
07
OR
Q.4 (a) What is consolidation? 03
(b) For the soil deposit shown below, draw the total stress pore water pressure
and effective stress diagrams. The water table is at ground level as shown
in the Figure below.
04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2154003 Date:27/11/2018
Subject Name:Geotechnical Engineering - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) A given cohesion less soil has emax = 0.85, emin = 0.5. In the field, the soil is
compacted to a mass density of 1800 kg/m
3
at water content of 8%. Take the
mass density of water as 1000 kg/m
3
and GS = 2.7. What is the value of
relative density, RD?
03
(b) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
04
(c) Prove the following using soil 3 phase diagram representation. (Any 3)
(1) ?? =
????
?? ?? (2) ?? =
(?? ?? +???? )?? ?? 1+??
(3) ?? ?? =
?? ??
?? ?? (1+?? )
(4) ?
?? = (1 ? ?? )?? ?? ?
??
07
Q.2 (a) As per the Indian Standard soil classification system, a sample of silty clay
with liquid limit of 75% and plasticity index of 45% is classified as? (Refer
to Figure 1)
03
(b) The results of sieve analysis of a soil are given below:
Total Wt.: 500 gm
IS sieve (mm) 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Mass Retained (gm)
0.08 0.81 1.67 2.15 9.09 132.45 310.3
Draw Particle Size Distribution curve on graph.
04
(c) By referring to Question 2 (b) above Calculate percentage of gravel, coarse
sand, Medium sand, fine sand, and fines (clay and silt). And Classify the
soil.
07
OR
(c) Explain the procedure of estimation of pre-consolidation stress using
Casagrande?s graphical method?
07
Q.3 (a) Draw a neat sketch for the consistency limits as proposed by Atterberg? 03
(b) A soil sample brought from the field was noted to have a volume of 40 cc
weight of 63 g. On oven drying, the weight of the sample was reduced to 55
g. The weight of the dry soil pat with paraffin wax coating was 60 g. The
volume of spilled out water due to immersion of pat was 40 cc. Calculate
the shrinkage limit and the specific gravity of solids? [Specific Gravity of
Wax = 0.83]
04
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(c) Liquid limit of Soil A is 38% , Soil B is 60% and Plastic limit of soil A is
25% and plastic limit is 30% then,
a) Which soil will be a better foundation material upon remoulding?
b) Which soil is more compressible?
c) Which Soil shows a higher rate of loss in shear strength upon increase
in water content?
07
OR
Q.3 (a) The compaction of an embankment is carried out in 300 mm thick lifts
(layers). The rammer used for compaction has the foot of area 0.05 m
2
. The
energy developed per drop of the rammer is 40 kg-m. Assuming 50 percent
more energy in each pass over the compacted area due to overlap, calculate
the number of passes to develop compactive energy equivalent to IS heavy
compaction for each layer ?
03
(b) Compare the compactive energy used in the IS heavy compaction test with
that of the IS light compaction test.
04
(c) Following data refers to a compaction test as per IS light Compaction.
Water Content
(%)
8.57 12.24 14.02 16.09 17.29 19.87
Wt. of wet sample (kg)
1.82 1.87 1.99 2.08 1.99 1.90
If the specific gravity of soil grains was 2.7, Plot the compaction curve and
obtain MDD and OMC with necessary detailed calculation.
07
Q.4 (a) What is the permeability of soil? How to determine permeability in
laboratory? What is the unit of Coefficient of permeability?
03
(b) In a falling head permeability test on a sample 12.2 cm high and 44.44 cm
2
in cross sectional area, the water level in a standpipe of 6.25 mm internal
diameter dropped from a height of 80 cm to 24.7 cm in 10 minutes. Find the
coefficient of permeability.
04
(c) Explain Casagrande?s Liquid limit determination method to determine
Liquid limit of Soil with neat sketch.
How you will find out liquid limit based on the test give suitable example
with graphical representation.
07
OR
Q.4 (a) What is consolidation? 03
(b) For the soil deposit shown below, draw the total stress pore water pressure
and effective stress diagrams. The water table is at ground level as shown
in the Figure below.
04
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(c) The following data refers to a compaction test as per Indian Standard (light
compaction):
Water Content (%) 8.50 12.20 13.75 15.50 18.20 20.20
Weight of wet sample
(kg)
1.80 1.94 2.00 2.05 2.03 1.98
If the specific gravity of soil grains was 2.65,
a) Plot the compaction curve and obtain the maximum dry unit weight
and the optimum moisture content;
b) Plot the 80% and 100 percent saturation lines;
c) If it is proposed to secure a relative compaction of 95% in the field,
what is the range of water content that can be allowed
Would the 20 percent air voids curve be the same as the 80 percent saturation
curve?
07
Q.5 (a) A specimen of sand from the subgrade of a road failed under following set
of conditions.
?3 (kg/cm
2
) ?1 (kg/cm
2
)
A 0.5 1.5
B 1.0 3.0
C 2.0 5.9
Find its friction angle?
03
(b) Referring to Q 5 (a) above when the subgrade was stabilized with cement
and the test was repeated. The results were:
?3 (kg/cm
2
) ?1 (kg/cm
2
)
A 0.5 2.2
B 1.0 3.9
C 2.0 7.0
Find the gain in the cohesion and also find the gain in the friction angle?
04
(c) Explain the laboratory measurement of permeability for both constant Head
flow method and falling head flow method. Derive the relationship of
coefficient of permeability for both constant head flow method and falling
head flow method?
07
OR
Q.5 (a) When an undrained Tri-axial compression test was conducted on specimens
of clayey silt, the following results were obtained.
Specimen No. 1 2 3
?3 (kN/m
2
) 17 44 56
?1 (kN/m
2
) 157 204 225
u (kN/m
2
) 12 20 22
Draw Stress Diagram for that by Mohr circle method.
03
(b) Referring to Q5 (a) above Determine the shear parameters considering
(i) Total stresses and (ii) effective stresses using Mohr-Coulomb failure
criterion?
04
(c) Derive Terzaghi?s one dimensional consolidation equation for computing
the rate of consolidation?
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2154003 Date:27/11/2018
Subject Name:Geotechnical Engineering - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) A given cohesion less soil has emax = 0.85, emin = 0.5. In the field, the soil is
compacted to a mass density of 1800 kg/m
3
at water content of 8%. Take the
mass density of water as 1000 kg/m
3
and GS = 2.7. What is the value of
relative density, RD?
03
(b) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
04
(c) Prove the following using soil 3 phase diagram representation. (Any 3)
(1) ?? =
????
?? ?? (2) ?? =
(?? ?? +???? )?? ?? 1+??
(3) ?? ?? =
?? ??
?? ?? (1+?? )
(4) ?
?? = (1 ? ?? )?? ?? ?
??
07
Q.2 (a) As per the Indian Standard soil classification system, a sample of silty clay
with liquid limit of 75% and plasticity index of 45% is classified as? (Refer
to Figure 1)
03
(b) The results of sieve analysis of a soil are given below:
Total Wt.: 500 gm
IS sieve (mm) 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Mass Retained (gm)
0.08 0.81 1.67 2.15 9.09 132.45 310.3
Draw Particle Size Distribution curve on graph.
04
(c) By referring to Question 2 (b) above Calculate percentage of gravel, coarse
sand, Medium sand, fine sand, and fines (clay and silt). And Classify the
soil.
07
OR
(c) Explain the procedure of estimation of pre-consolidation stress using
Casagrande?s graphical method?
07
Q.3 (a) Draw a neat sketch for the consistency limits as proposed by Atterberg? 03
(b) A soil sample brought from the field was noted to have a volume of 40 cc
weight of 63 g. On oven drying, the weight of the sample was reduced to 55
g. The weight of the dry soil pat with paraffin wax coating was 60 g. The
volume of spilled out water due to immersion of pat was 40 cc. Calculate
the shrinkage limit and the specific gravity of solids? [Specific Gravity of
Wax = 0.83]
04
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(c) Liquid limit of Soil A is 38% , Soil B is 60% and Plastic limit of soil A is
25% and plastic limit is 30% then,
a) Which soil will be a better foundation material upon remoulding?
b) Which soil is more compressible?
c) Which Soil shows a higher rate of loss in shear strength upon increase
in water content?
07
OR
Q.3 (a) The compaction of an embankment is carried out in 300 mm thick lifts
(layers). The rammer used for compaction has the foot of area 0.05 m
2
. The
energy developed per drop of the rammer is 40 kg-m. Assuming 50 percent
more energy in each pass over the compacted area due to overlap, calculate
the number of passes to develop compactive energy equivalent to IS heavy
compaction for each layer ?
03
(b) Compare the compactive energy used in the IS heavy compaction test with
that of the IS light compaction test.
04
(c) Following data refers to a compaction test as per IS light Compaction.
Water Content
(%)
8.57 12.24 14.02 16.09 17.29 19.87
Wt. of wet sample (kg)
1.82 1.87 1.99 2.08 1.99 1.90
If the specific gravity of soil grains was 2.7, Plot the compaction curve and
obtain MDD and OMC with necessary detailed calculation.
07
Q.4 (a) What is the permeability of soil? How to determine permeability in
laboratory? What is the unit of Coefficient of permeability?
03
(b) In a falling head permeability test on a sample 12.2 cm high and 44.44 cm
2
in cross sectional area, the water level in a standpipe of 6.25 mm internal
diameter dropped from a height of 80 cm to 24.7 cm in 10 minutes. Find the
coefficient of permeability.
04
(c) Explain Casagrande?s Liquid limit determination method to determine
Liquid limit of Soil with neat sketch.
How you will find out liquid limit based on the test give suitable example
with graphical representation.
07
OR
Q.4 (a) What is consolidation? 03
(b) For the soil deposit shown below, draw the total stress pore water pressure
and effective stress diagrams. The water table is at ground level as shown
in the Figure below.
04
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(c) The following data refers to a compaction test as per Indian Standard (light
compaction):
Water Content (%) 8.50 12.20 13.75 15.50 18.20 20.20
Weight of wet sample
(kg)
1.80 1.94 2.00 2.05 2.03 1.98
If the specific gravity of soil grains was 2.65,
a) Plot the compaction curve and obtain the maximum dry unit weight
and the optimum moisture content;
b) Plot the 80% and 100 percent saturation lines;
c) If it is proposed to secure a relative compaction of 95% in the field,
what is the range of water content that can be allowed
Would the 20 percent air voids curve be the same as the 80 percent saturation
curve?
07
Q.5 (a) A specimen of sand from the subgrade of a road failed under following set
of conditions.
?3 (kg/cm
2
) ?1 (kg/cm
2
)
A 0.5 1.5
B 1.0 3.0
C 2.0 5.9
Find its friction angle?
03
(b) Referring to Q 5 (a) above when the subgrade was stabilized with cement
and the test was repeated. The results were:
?3 (kg/cm
2
) ?1 (kg/cm
2
)
A 0.5 2.2
B 1.0 3.9
C 2.0 7.0
Find the gain in the cohesion and also find the gain in the friction angle?
04
(c) Explain the laboratory measurement of permeability for both constant Head
flow method and falling head flow method. Derive the relationship of
coefficient of permeability for both constant head flow method and falling
head flow method?
07
OR
Q.5 (a) When an undrained Tri-axial compression test was conducted on specimens
of clayey silt, the following results were obtained.
Specimen No. 1 2 3
?3 (kN/m
2
) 17 44 56
?1 (kN/m
2
) 157 204 225
u (kN/m
2
) 12 20 22
Draw Stress Diagram for that by Mohr circle method.
03
(b) Referring to Q5 (a) above Determine the shear parameters considering
(i) Total stresses and (ii) effective stresses using Mohr-Coulomb failure
criterion?
04
(c) Derive Terzaghi?s one dimensional consolidation equation for computing
the rate of consolidation?
07
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Appendix
Figure 1: Plasticity chart as per Indian Standard Soil Classification System
*************
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This post was last modified on 20 February 2020