Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3130606 Geotechnical Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3130606 Date: 26/11/2019
Subject Name: Geotechnical Engineering
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.
Q.1 (a) Explain briefly with diagram Geological Cycle.
03
(b) What is the scope of geotechnical engineering in the field
of civil Engineering?
04
(c) Define the following terms: (i) water content (ii) void
ratio (iii) porosity (iv) Unit weight of solids (v) Air
content (vi) Bulk Unit weight (vii)Specific gravity
07
Q.2 (a) What are the purposes of the soil classification?
03
(b) Explain the various factors affecting compaction.
04
(c) A soil sample has a porosity of 40 percent. The specific
gravity of solids is 2.70. Calculate (a) void ratio, (b) dry
density, (c) unit weight if the soil is 50% saturated and
(d) unit weight if the soil is completely saturated.
07
OR
(c) The following are the result of the standard compaction
test:-
Water content (%) 05 10
14 20 25
Bulk density
(kN/m
3
)
17.5
19.5 21 22 21.5
Plot the MDD-OMC curve and obtain the optimum water
content and maximum dry density.
07
Q.3 (a) Explain briefly each factor affecting permeability of
soils.
03
(b) Define term consolidation Explain with sketch
Terzaghi?s One Dimensional Consolidation using Spring
Analogy
04
(c) Define with sketch Flow net. Its characteristics and its
application.
07
OR
Q.3 (a) Differentiate between standard proctor and modified
proctor test.
03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3130606 Date: 26/11/2019
Subject Name: Geotechnical Engineering
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.
Q.1 (a) Explain briefly with diagram Geological Cycle.
03
(b) What is the scope of geotechnical engineering in the field
of civil Engineering?
04
(c) Define the following terms: (i) water content (ii) void
ratio (iii) porosity (iv) Unit weight of solids (v) Air
content (vi) Bulk Unit weight (vii)Specific gravity
07
Q.2 (a) What are the purposes of the soil classification?
03
(b) Explain the various factors affecting compaction.
04
(c) A soil sample has a porosity of 40 percent. The specific
gravity of solids is 2.70. Calculate (a) void ratio, (b) dry
density, (c) unit weight if the soil is 50% saturated and
(d) unit weight if the soil is completely saturated.
07
OR
(c) The following are the result of the standard compaction
test:-
Water content (%) 05 10
14 20 25
Bulk density
(kN/m
3
)
17.5
19.5 21 22 21.5
Plot the MDD-OMC curve and obtain the optimum water
content and maximum dry density.
07
Q.3 (a) Explain briefly each factor affecting permeability of
soils.
03
(b) Define term consolidation Explain with sketch
Terzaghi?s One Dimensional Consolidation using Spring
Analogy
04
(c) Define with sketch Flow net. Its characteristics and its
application.
07
OR
Q.3 (a) Differentiate between standard proctor and modified
proctor test.
03
2
(b) Differentiate between the process of consolidation and
compaction.
04
(c) Define Coefficient of compressibility, Coefficient of
Volume change, Compression Index.
During consolidation test, the void ratio is determined to
decrease from 0.80 to 0.40 under the stress increment of
100 kPa to 250 kPa. Compute coefficient of
compressibility, coefficient of volume compressibility &
compression index.
07
Q.4 (a) Differentiate between active and passive earth pressure
with relevant examples.
03
(b) Explain Rankine?s earth pressure theory for
determination of lateral earth pressure under different
conditions?
04
(c) Explain Newmark?s Chart and its application.
07
OR
Q.4 (a) Differentiate between General shear failure and Local
shear failure with neat sketch.
03
(b) Differentiate between Direct Shear Box and Triaxial
Test.
04
(c) Write a short note on ?soil water? and ?soil structure?.
Also explain about commonly observed soil structures.
07
Q.5 (a) Enlist factor affecting the bearing capacity and explain
anytwo in detail.
03
(b) Explain Modified Mohr Coulomb failure theory for shear
strength? Sketch typical strength envelop for different
type of soil.
04
(c) What are the three standard triaxial shear tests with
respect todrainage conditions? Explain with reasons the
situations for whicheach test is to be preferred.
07
OR
Q.5 (a) What are different factors of safety used in the stability
of slopes? Discuss briefly.
03
(b) Discuss briefly, different types of slope failures.
04
(c) Define Safe, Allowable and Ultimate bearing capacity of
soil. Write down Taraghi?s bearing capacity equation, its
assumption and limitation of analysis.
07
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This post was last modified on 20 February 2020