Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2154003 Geotechnical Engineering I Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2154003 Date: 06/06/2019
Subject Name:Geotechnical Engineering - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Semi-log papers & Arithmetic graph papers can be requested from the invigilator.
MARKS
Q.1 (a) What are the Scope and limitation of geo-technical engineering in civil
engineering?
03
(b) Explain Saturated and Dry state of soil by using phase diagram system. 04
(c)
Derive: ?? =
?? ?? ?? ?? ?? (1+?? )?
1
?? ??
07
Q.2 (a) 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)
13.1 4.64 2.26 1.08 1.95 364.54 107.8
Draw Particle Size Distribution curve on graph.
03
(b) By referring to Question 2 (a) above Determine uniformity coefficient
and coefficient of curvature.
04
(c) By referring to Question 2 (a) above Calculate percentage of gravel,
coarse sand, Medium sand, fine sand, and fines (clay and silt). And
Classify the soil.
07
OR
(c) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
07
Q.3 (a) A sampler with a volume of 45 cm
3
is filled with a non-cohesive dry soil
sample. When the soil is poured into a graduated cylinder, it displaces
25 cm
3
of water. What is the porosity and void ratio of the soil?
03
(b) Define Consistency Limits as per Atterberg with necessary sketch. 04
(c) In a proctor compaction test, the soil specimen of one of the observation
had a bulk density of 19 kN/m
3
with a moisture content of 15%.Gs =
2.7.Determine,
1. Degree of Saturation of the specimen
2. Additional moisture content required for saturating the soil
specimen.
07
FirstRanker.com - FirstRanker's Choice
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2154003 Date: 06/06/2019
Subject Name:Geotechnical Engineering - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Semi-log papers & Arithmetic graph papers can be requested from the invigilator.
MARKS
Q.1 (a) What are the Scope and limitation of geo-technical engineering in civil
engineering?
03
(b) Explain Saturated and Dry state of soil by using phase diagram system. 04
(c)
Derive: ?? =
?? ?? ?? ?? ?? (1+?? )?
1
?? ??
07
Q.2 (a) 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)
13.1 4.64 2.26 1.08 1.95 364.54 107.8
Draw Particle Size Distribution curve on graph.
03
(b) By referring to Question 2 (a) above Determine uniformity coefficient
and coefficient of curvature.
04
(c) By referring to Question 2 (a) above Calculate percentage of gravel,
coarse sand, Medium sand, fine sand, and fines (clay and silt). And
Classify the soil.
07
OR
(c) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
07
Q.3 (a) A sampler with a volume of 45 cm
3
is filled with a non-cohesive dry soil
sample. When the soil is poured into a graduated cylinder, it displaces
25 cm
3
of water. What is the porosity and void ratio of the soil?
03
(b) Define Consistency Limits as per Atterberg with necessary sketch. 04
(c) In a proctor compaction test, the soil specimen of one of the observation
had a bulk density of 19 kN/m
3
with a moisture content of 15%.Gs =
2.7.Determine,
1. Degree of Saturation of the specimen
2. Additional moisture content required for saturating the soil
specimen.
07
OR
Q.3 (a)
Derive, ?? =
?? 1+??
03
(b) During a hydrometer analysis a soil with a Gs=2.7 Is immersed in a water
suspension with temperature of 24?C, An R=41 cm is obtained after 60
minutes of sedimentation.
What is the diameter of D of the smallest-size particles that have the
settled during that time?
For an ASTM 152 H hydrometer, the value of L for any reading R
(corrected for meniscus) may be obtained from L=16.3-0.1641R.
Refer to constant K vs T table given in Appendix
04
(c) What are the factors affecting compaction? Explain it precisely? Explain
OMC and Zero Air Void Density? Write the relationship of dry unit
weight in terms of water content and Degree of Saturation?
07
Q.4 (a) What is consolidation? 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) Derive Terzaghi?s one dimensional consolidation equation for
computing the rate of consolidation?
07
OR
Q.4 (a) What are the assumptions made in the derivation of Terzaghi?s 1D
Consolidation Equation?
03
(b) During a consolidation test, a sample of fully saturated clay 3 cm thick
is consolidated under a pressure increment of 200 kN/m
2
. When
equilibrium is reached, the sample thickness is reduced to 2.60 cm. The
pressure is then removed and the sample is allowed to expand and absorb
water. The final thickness is observed as 2.8 cm and the final moisture
content is determined as 24%. If the specific gravity of the soil solids is
2.70, find the voids ratio of the sample before and after consolidation?
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
Q.5 (a) Explain Mohr Circle of stresses? 03
(b) An excavation was made in a clay stratum having ?
t
= 2 T/m
3
. When
the depth was 7.5m, the bottom of the excavation cracked and the pit was
filled by a mixture of sand and water.
04
FirstRanker.com - FirstRanker's Choice
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2154003 Date: 06/06/2019
Subject Name:Geotechnical Engineering - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Semi-log papers & Arithmetic graph papers can be requested from the invigilator.
MARKS
Q.1 (a) What are the Scope and limitation of geo-technical engineering in civil
engineering?
03
(b) Explain Saturated and Dry state of soil by using phase diagram system. 04
(c)
Derive: ?? =
?? ?? ?? ?? ?? (1+?? )?
1
?? ??
07
Q.2 (a) 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)
13.1 4.64 2.26 1.08 1.95 364.54 107.8
Draw Particle Size Distribution curve on graph.
03
(b) By referring to Question 2 (a) above Determine uniformity coefficient
and coefficient of curvature.
04
(c) By referring to Question 2 (a) above Calculate percentage of gravel,
coarse sand, Medium sand, fine sand, and fines (clay and silt). And
Classify the soil.
07
OR
(c) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
07
Q.3 (a) A sampler with a volume of 45 cm
3
is filled with a non-cohesive dry soil
sample. When the soil is poured into a graduated cylinder, it displaces
25 cm
3
of water. What is the porosity and void ratio of the soil?
03
(b) Define Consistency Limits as per Atterberg with necessary sketch. 04
(c) In a proctor compaction test, the soil specimen of one of the observation
had a bulk density of 19 kN/m
3
with a moisture content of 15%.Gs =
2.7.Determine,
1. Degree of Saturation of the specimen
2. Additional moisture content required for saturating the soil
specimen.
07
OR
Q.3 (a)
Derive, ?? =
?? 1+??
03
(b) During a hydrometer analysis a soil with a Gs=2.7 Is immersed in a water
suspension with temperature of 24?C, An R=41 cm is obtained after 60
minutes of sedimentation.
What is the diameter of D of the smallest-size particles that have the
settled during that time?
For an ASTM 152 H hydrometer, the value of L for any reading R
(corrected for meniscus) may be obtained from L=16.3-0.1641R.
Refer to constant K vs T table given in Appendix
04
(c) What are the factors affecting compaction? Explain it precisely? Explain
OMC and Zero Air Void Density? Write the relationship of dry unit
weight in terms of water content and Degree of Saturation?
07
Q.4 (a) What is consolidation? 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) Derive Terzaghi?s one dimensional consolidation equation for
computing the rate of consolidation?
07
OR
Q.4 (a) What are the assumptions made in the derivation of Terzaghi?s 1D
Consolidation Equation?
03
(b) During a consolidation test, a sample of fully saturated clay 3 cm thick
is consolidated under a pressure increment of 200 kN/m
2
. When
equilibrium is reached, the sample thickness is reduced to 2.60 cm. The
pressure is then removed and the sample is allowed to expand and absorb
water. The final thickness is observed as 2.8 cm and the final moisture
content is determined as 24%. If the specific gravity of the soil solids is
2.70, find the voids ratio of the sample before and after consolidation?
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
Q.5 (a) Explain Mohr Circle of stresses? 03
(b) An excavation was made in a clay stratum having ?
t
= 2 T/m
3
. When
the depth was 7.5m, the bottom of the excavation cracked and the pit was
filled by a mixture of sand and water.
04
The thickness of the
clay layer was 10.5
m, and below it was a
layer of pervious
water-bearing sand
(Refer Figure). How
much was the
artesian pressure in
the sand layer?
(c) Results of consolidated undrained strength from ????
? ? ? ?
tests conducted on
two saturated normally consolidated clay samples are given below.
Determine the shear strength parameters by using Mohr-Coulomb
failure criterion?
Sample1 Sample2
Confining pressure 4.8
kg/cm
2
6.3
kg/cm
2
Axial stress at failure 6.8
kg/cm
2
9.3
kg/cm
2
Pore water pressure at failure
(Stage 2 specimen is sheared in undrained
condition)
3.8
kg/cm
2
4.8
kg/cm
2
07
OR
Q.5 (a) Define:
a) Immediate settlement
b) Primary consolidation settlement
c) Secondary consolidation settlement
03
(b) For a field pumping test, a well was sunk through a horizontal stratum
of sand 14.5 m thick and underlain by a clay stratum. Two observation
wells were sunk at horizontal distances of 16m and 34m respectively
from the pumping well. The initial position of the water table was 2.2 m
below ground level. At a steady state pumping rate of 925 litres/ min, the
drawdowns in the observation wells were found to be 2.45 m and 1.20
m respectively. Calculate the coefficient of permeability of the sand?
04
(c) A UU test is carried out on a saturated normally consolidated clay sample
at a confining pressure of 3 kg/cm
2
.The deviator stress at failure is 1
kg/cm
2
.
a) Determine its total stress strength parameters.
b) If another identical sample is tested at a confining pressure of 4
kg/cm
2
, what will be the vertical axial stress at failure?
07
FirstRanker.com - FirstRanker's Choice
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2154003 Date: 06/06/2019
Subject Name:Geotechnical Engineering - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Semi-log papers & Arithmetic graph papers can be requested from the invigilator.
MARKS
Q.1 (a) What are the Scope and limitation of geo-technical engineering in civil
engineering?
03
(b) Explain Saturated and Dry state of soil by using phase diagram system. 04
(c)
Derive: ?? =
?? ?? ?? ?? ?? (1+?? )?
1
?? ??
07
Q.2 (a) 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)
13.1 4.64 2.26 1.08 1.95 364.54 107.8
Draw Particle Size Distribution curve on graph.
03
(b) By referring to Question 2 (a) above Determine uniformity coefficient
and coefficient of curvature.
04
(c) By referring to Question 2 (a) above Calculate percentage of gravel,
coarse sand, Medium sand, fine sand, and fines (clay and silt). And
Classify the soil.
07
OR
(c) Derive the relationship of determining water content by Pycnometer
method? (Draw a neat sketch)
07
Q.3 (a) A sampler with a volume of 45 cm
3
is filled with a non-cohesive dry soil
sample. When the soil is poured into a graduated cylinder, it displaces
25 cm
3
of water. What is the porosity and void ratio of the soil?
03
(b) Define Consistency Limits as per Atterberg with necessary sketch. 04
(c) In a proctor compaction test, the soil specimen of one of the observation
had a bulk density of 19 kN/m
3
with a moisture content of 15%.Gs =
2.7.Determine,
1. Degree of Saturation of the specimen
2. Additional moisture content required for saturating the soil
specimen.
07
OR
Q.3 (a)
Derive, ?? =
?? 1+??
03
(b) During a hydrometer analysis a soil with a Gs=2.7 Is immersed in a water
suspension with temperature of 24?C, An R=41 cm is obtained after 60
minutes of sedimentation.
What is the diameter of D of the smallest-size particles that have the
settled during that time?
For an ASTM 152 H hydrometer, the value of L for any reading R
(corrected for meniscus) may be obtained from L=16.3-0.1641R.
Refer to constant K vs T table given in Appendix
04
(c) What are the factors affecting compaction? Explain it precisely? Explain
OMC and Zero Air Void Density? Write the relationship of dry unit
weight in terms of water content and Degree of Saturation?
07
Q.4 (a) What is consolidation? 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) Derive Terzaghi?s one dimensional consolidation equation for
computing the rate of consolidation?
07
OR
Q.4 (a) What are the assumptions made in the derivation of Terzaghi?s 1D
Consolidation Equation?
03
(b) During a consolidation test, a sample of fully saturated clay 3 cm thick
is consolidated under a pressure increment of 200 kN/m
2
. When
equilibrium is reached, the sample thickness is reduced to 2.60 cm. The
pressure is then removed and the sample is allowed to expand and absorb
water. The final thickness is observed as 2.8 cm and the final moisture
content is determined as 24%. If the specific gravity of the soil solids is
2.70, find the voids ratio of the sample before and after consolidation?
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
Q.5 (a) Explain Mohr Circle of stresses? 03
(b) An excavation was made in a clay stratum having ?
t
= 2 T/m
3
. When
the depth was 7.5m, the bottom of the excavation cracked and the pit was
filled by a mixture of sand and water.
04
The thickness of the
clay layer was 10.5
m, and below it was a
layer of pervious
water-bearing sand
(Refer Figure). How
much was the
artesian pressure in
the sand layer?
(c) Results of consolidated undrained strength from ????
? ? ? ?
tests conducted on
two saturated normally consolidated clay samples are given below.
Determine the shear strength parameters by using Mohr-Coulomb
failure criterion?
Sample1 Sample2
Confining pressure 4.8
kg/cm
2
6.3
kg/cm
2
Axial stress at failure 6.8
kg/cm
2
9.3
kg/cm
2
Pore water pressure at failure
(Stage 2 specimen is sheared in undrained
condition)
3.8
kg/cm
2
4.8
kg/cm
2
07
OR
Q.5 (a) Define:
a) Immediate settlement
b) Primary consolidation settlement
c) Secondary consolidation settlement
03
(b) For a field pumping test, a well was sunk through a horizontal stratum
of sand 14.5 m thick and underlain by a clay stratum. Two observation
wells were sunk at horizontal distances of 16m and 34m respectively
from the pumping well. The initial position of the water table was 2.2 m
below ground level. At a steady state pumping rate of 925 litres/ min, the
drawdowns in the observation wells were found to be 2.45 m and 1.20
m respectively. Calculate the coefficient of permeability of the sand?
04
(c) A UU test is carried out on a saturated normally consolidated clay sample
at a confining pressure of 3 kg/cm
2
.The deviator stress at failure is 1
kg/cm
2
.
a) Determine its total stress strength parameters.
b) If another identical sample is tested at a confining pressure of 4
kg/cm
2
, what will be the vertical axial stress at failure?
07
Appendix
Figure 1 Plasticity chart as per Indian Standard Soil Classification System
Table 1 Constant K versus Temperature T (?C)
*************
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This post was last modified on 20 February 2020