Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2164003 Geotechnical Engineering Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2164003 Date:16/05/2019
Subject Name:Geotechnical Engineering - II
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.
4. Support your answer with neat sketches wherever possible.
MARKS
Q.1 (a) Explain the active and passive Rankine states with the help of Mohr?s circle
diagram in a cohesion less soil.
03
(b) Illustrate different shear failure modes of a shallow foundation, with the
help of neat sketches.
04
(c) Illustarte load transfer mechanism of shallow foundation and pile
foundation.
07
Q.2 (a) Critically differentiate between Rankine and Coulomb theories of earth
pressure.
03
(b) Enlist various geosynthetic materials and their suitability in geotechnical
engineering work.
04
(c) Draw active earth pressure diagram acting on retaining wall.
07
10 m
15 m
?=20 kN/m
3
, c = 25 kN/m
2
, ?=25
0
? sat =21 kN/m
3
, c = 20 kN/m
2
, ?= 40
0
25 kN/m
2
WT
8 m
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2164003 Date:16/05/2019
Subject Name:Geotechnical Engineering - II
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.
4. Support your answer with neat sketches wherever possible.
MARKS
Q.1 (a) Explain the active and passive Rankine states with the help of Mohr?s circle
diagram in a cohesion less soil.
03
(b) Illustrate different shear failure modes of a shallow foundation, with the
help of neat sketches.
04
(c) Illustarte load transfer mechanism of shallow foundation and pile
foundation.
07
Q.2 (a) Critically differentiate between Rankine and Coulomb theories of earth
pressure.
03
(b) Enlist various geosynthetic materials and their suitability in geotechnical
engineering work.
04
(c) Draw active earth pressure diagram acting on retaining wall.
07
10 m
15 m
?=20 kN/m
3
, c = 25 kN/m
2
, ?=25
0
? sat =21 kN/m
3
, c = 20 kN/m
2
, ?= 40
0
25 kN/m
2
WT
8 m
OR
(c) Draw passive earth pressure diagram acting on retaining wall.
07
Q.3 (a) What are various components of foundation settlement? 03
(b) Describe the concept of earth reinforcement. 04
(c) Determine settlement of pile group of 3x3 and length of 8 m.
07
OR
Q.3 (a) What are criteria?s to differentiate between shallow and deep foundations
other than foundation depth.
03
(b) Explain variation of contact pressure under rigid and flexible footings
resting on cohesive and cohesionless soils using neat sketches.
04
(c) Nine piles of 300 mm diameter and 8 m length are arranged in a square
pattern in cohesive soil with unconfined compressive strength of 50 kN/m
2
.
Center to center spacing is 900 mm. Assume adhesion factor to be 0.9.
Evaluate the allowable bearing capacity of pile group assuming factor of
safety of 2.5.
07
15 m
20 m
?=18 kN/m
3
, c = 20 kPa, ?=25
0
? sat =21 kN/m
3
, c = 25 kPa, ?= 30
0
5 kN/m
2
WT
2 m
10 m
Clay, ? = 18 kN/m
3
e=0.45, c c =0.5
Clay, ?
sat
= 18 kN/m, e=0.40, c c =0.7
1500 kN
Sand, ? = 18 kN/m
3
10 m
5 m
WT
FirstRanker.com - FirstRanker's Choice
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2164003 Date:16/05/2019
Subject Name:Geotechnical Engineering - II
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.
4. Support your answer with neat sketches wherever possible.
MARKS
Q.1 (a) Explain the active and passive Rankine states with the help of Mohr?s circle
diagram in a cohesion less soil.
03
(b) Illustrate different shear failure modes of a shallow foundation, with the
help of neat sketches.
04
(c) Illustarte load transfer mechanism of shallow foundation and pile
foundation.
07
Q.2 (a) Critically differentiate between Rankine and Coulomb theories of earth
pressure.
03
(b) Enlist various geosynthetic materials and their suitability in geotechnical
engineering work.
04
(c) Draw active earth pressure diagram acting on retaining wall.
07
10 m
15 m
?=20 kN/m
3
, c = 25 kN/m
2
, ?=25
0
? sat =21 kN/m
3
, c = 20 kN/m
2
, ?= 40
0
25 kN/m
2
WT
8 m
OR
(c) Draw passive earth pressure diagram acting on retaining wall.
07
Q.3 (a) What are various components of foundation settlement? 03
(b) Describe the concept of earth reinforcement. 04
(c) Determine settlement of pile group of 3x3 and length of 8 m.
07
OR
Q.3 (a) What are criteria?s to differentiate between shallow and deep foundations
other than foundation depth.
03
(b) Explain variation of contact pressure under rigid and flexible footings
resting on cohesive and cohesionless soils using neat sketches.
04
(c) Nine piles of 300 mm diameter and 8 m length are arranged in a square
pattern in cohesive soil with unconfined compressive strength of 50 kN/m
2
.
Center to center spacing is 900 mm. Assume adhesion factor to be 0.9.
Evaluate the allowable bearing capacity of pile group assuming factor of
safety of 2.5.
07
15 m
20 m
?=18 kN/m
3
, c = 20 kPa, ?=25
0
? sat =21 kN/m
3
, c = 25 kPa, ?= 30
0
5 kN/m
2
WT
2 m
10 m
Clay, ? = 18 kN/m
3
e=0.45, c c =0.5
Clay, ?
sat
= 18 kN/m, e=0.40, c c =0.7
1500 kN
Sand, ? = 18 kN/m
3
10 m
5 m
WT
Q.4 (a) What do mean by disturbed and undisturbed soil sample? 03
(b) Enlist various field tests to determine the shear strength of soil? 04
(c) A strip footing with 3 m width is founded at a depth of 2 m below the
ground surface in a (c-?) soil having a cohesion c = 30 kN/m
2
and angle of
shearing resistance = 35?. The moist weight of soil above the water table is
17.25 kN/m
3
. Initially, water table is observed to be 1.25 m below ground
level, but after some time the water table lowered down to 1.25 m below
the foundation base. Determine the change in bearing capacity due to
change in water table. ?=35, N c=57.8, N q=41.4 and N y= 41.1.
07
OR
Q.4 (a) State the objectives of soil exploration. 03
(b) Explain Terzaghi?s method to determine bearing capacity. 04
(c) A square footing fails by general shear in a cohesionless soil under an
ultimate stress of 1687.5 kPa. The footing is placed at the ground level.
Given ? = 35?, and ? =20 kN/m
3
, determine the size of the footing if the
water table is at the base of footing. For, ?=35, Nc=57.8, Nq=41.4 and Ny=
41.1.
07
Q.5 (a) Explain friction circle and Swedish circle methods to determine stability of
slope.
03
(b) Derive an equation to determine the stability of circular slope of purely
cohesive soil under seismic loading.
04
(c) Describe the following: (a) Fender pile; (b) SPT; (c) Pile group efficiency
(d) Grouting
07
OR
Q.5 (a) Discuss various steps involved in soil exploration? 03
(b) Derive an equation for unsupported height in cohesionless soil. 04
(c) Describe the following: (a) Negative skin friction; (b) Significant depth; (c)
Geonet; (d) Plate load test,
07
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This post was last modified on 20 February 2020