Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2164003 Geotechnical Engineering Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2164003 Date: 09/12/2019
Subject Name: Geotechnical Engineering - II
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.
Marks
Q.1 (a) What are disadvantages and advantages of SPT test? 03
(b) Explain the concept of earth pressure using Mohr?s circle. 04
(c) Derive an equation to determine the factor of safety of soil under sudden
drawdown condition.
07
Q.2 (a) What is negative skin friction in pile foundation? 03
(b) Explain Terzaghi?s bearing capacity theory with a neat sketch. 04
(c) Draw the passive earth pressure diagram for the retaining wall shown in
Figure 1.
Figure 1
07
OR
(c) Draw the active earth pressure diagram for the retaining wall shown in
Figure 1.
07
Q.3 (a) Explain the concept of floating foundation. 03
(b) A long natural slope of cohesion-less soil is inclined at 12? to the
horizontal. What will be the factor of safety of the slope if ? = 30??
04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2164003 Date: 09/12/2019
Subject Name: Geotechnical Engineering - II
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.
Marks
Q.1 (a) What are disadvantages and advantages of SPT test? 03
(b) Explain the concept of earth pressure using Mohr?s circle. 04
(c) Derive an equation to determine the factor of safety of soil under sudden
drawdown condition.
07
Q.2 (a) What is negative skin friction in pile foundation? 03
(b) Explain Terzaghi?s bearing capacity theory with a neat sketch. 04
(c) Draw the passive earth pressure diagram for the retaining wall shown in
Figure 1.
Figure 1
07
OR
(c) Draw the active earth pressure diagram for the retaining wall shown in
Figure 1.
07
Q.3 (a) Explain the concept of floating foundation. 03
(b) A long natural slope of cohesion-less soil is inclined at 12? to the
horizontal. What will be the factor of safety of the slope if ? = 30??
04
2
(c) An 8 m long and 300 mm-diameter precast concrete pile is driven into a
sand with ?= 37
0
and ? = 19.0 kN/m
3
. Estimate the maximum load
allowed on the pile. Nq=41. K=1.0, ?=1.0
07
OR
Q.3 (a) Explain the principles of preloading for soil treatment. 03
(b) Explain the mechanism of shallow foundation failure. 04
(c) A 500 mm-diameter and 20 meter long concrete pile is driven into the
ground where the top 5 m has cu = 50 kPa, which was underlain by clay
with cu = 200 kPa. Estimate the maximum load allowed safely on the
pile. Assume factor of safety to be 2.5.
07
Q.4 (a) Describe the methods of soil sampling suitable for cohesionless and
cohesive soils
03
(b) Explain Jumiki?s method to determine center of critical circle for a c-?
soil.
04
(c) A foundation, 2.0 m square is installed 1.2 m below the surface of a
uniform sandy gravel having a density of 19 kN/m
3
, above the water
table and a submerged density of 10 kN/m
3
. The strength parameters
with respect to effective stress are c? = 0 and ? = 30?. (Nq = 22 and N? =
20). Determine the change in gross ultimate bearing capacity if water
table rises from base of footing to ground surface.
07
OR
Q.4 (a) What is difference between bearing capacity failure and shear failure? 03
(b) Describe the factors affecting the selection of foundation?s type. 04
(c) A circular footing is resting on a stiff saturated clay with qu = 250 kN/m
2
.
The depth of foundation is 2 m. Determine the diameter of the footing if
the column load is 600 kN. Assume a factor of safety as 2.5. The bulk
unit weight of soil is 20 kN/m
3
. (Nc = 5.7, Nq = 1, N? = 0)
07
Q.5 (a) What is significant depth in soil exploration? 03
(b) What are different failure mechanism of pile foundation? 04
(c) Write short note on followings:
i) SCPT
ii) Compaction piles
iii) Hiley dynamic formulae
iv) Pile load test
07
OR
Q.5 (a) Explain the concept of soil reinforcement. 03
(b) Enlist various type of geosynthetics and provide their suitability in the
field.
04
(c) Write short note on followings:
i) Plate load test
ii) Pile group
iii) Grouting techniques
iv) wash boring
07
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This post was last modified on 20 February 2020