Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem Old 160606 Geotechnical Engineering Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:160606 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.
Q.1 (a) Explain active earth pressure, passive earth pressure and earth pressure at rest. in
detail.
07
(b) What are the assumptions made in the theory of Terzaghi?s analysis? 07
Q.2 (a) Differentiate between strip footing and strap footing. 07
(b) Describe with neat sketch wash boring method of sub- soil exploration. What are
its merit and demerits?
07
OR
(b) Explain briefly Boring Log and sub-surface profile 07
Q.3 (a) Explain any one penetration tests and its outcomes. 07
(b) Determine the size of square footing if it is placed at 1.8m depth on sandy soil
has following property: ?=37?, ? =18kN/m
3
. Neglect the water table effect.
Footing has to carry 2000kN.Ultimate load use Terzaghi?s equation.
07
OR
Q.3 (a) A retaining wall of height 6.0 m has a horizontal backfill with C=22 kPa, ? = 20?
& ?t = 19 kN/m
3
. Compute the total passive thrust acting on the wall.
07
(b) What are the graphical method available for the determination of active earth
pressure? Explain any one in detail.
07
Q.4 (a) Differentiate between Finite and Infinite slope. Explain the method of checking
the stability of a finite slope by Swedish method of Slices for a Cohesive
frictional soil.
07
(b) The results of the plate load test conducted on a 0.3m square plate at a depth of
1.2m on dry sand is given below.
Load
intensity
(kN/m2
0 50 100 150 200 250 275 300 325 350
Settlement
(mm)
0 3 5 10 13 19 22 28 39 65
Determine net allowable bearing capacity for footing of size 2.4m x 2.4m with
factor of safety 3 and settlement not to exceed 50mm. Foundation is placed at
1.2m depth. Neglect water table effect.
07
OR
Q.4 (a) Define Under Reamed pile. Discuss its method of construction with help of a neat
sketch and give criteria for bulb design.
07
(b) Discuss various types of shallow foundation with neat figures. 07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:160606 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.
Q.1 (a) Explain active earth pressure, passive earth pressure and earth pressure at rest. in
detail.
07
(b) What are the assumptions made in the theory of Terzaghi?s analysis? 07
Q.2 (a) Differentiate between strip footing and strap footing. 07
(b) Describe with neat sketch wash boring method of sub- soil exploration. What are
its merit and demerits?
07
OR
(b) Explain briefly Boring Log and sub-surface profile 07
Q.3 (a) Explain any one penetration tests and its outcomes. 07
(b) Determine the size of square footing if it is placed at 1.8m depth on sandy soil
has following property: ?=37?, ? =18kN/m
3
. Neglect the water table effect.
Footing has to carry 2000kN.Ultimate load use Terzaghi?s equation.
07
OR
Q.3 (a) A retaining wall of height 6.0 m has a horizontal backfill with C=22 kPa, ? = 20?
& ?t = 19 kN/m
3
. Compute the total passive thrust acting on the wall.
07
(b) What are the graphical method available for the determination of active earth
pressure? Explain any one in detail.
07
Q.4 (a) Differentiate between Finite and Infinite slope. Explain the method of checking
the stability of a finite slope by Swedish method of Slices for a Cohesive
frictional soil.
07
(b) The results of the plate load test conducted on a 0.3m square plate at a depth of
1.2m on dry sand is given below.
Load
intensity
(kN/m2
0 50 100 150 200 250 275 300 325 350
Settlement
(mm)
0 3 5 10 13 19 22 28 39 65
Determine net allowable bearing capacity for footing of size 2.4m x 2.4m with
factor of safety 3 and settlement not to exceed 50mm. Foundation is placed at
1.2m depth. Neglect water table effect.
07
OR
Q.4 (a) Define Under Reamed pile. Discuss its method of construction with help of a neat
sketch and give criteria for bulb design.
07
(b) Discuss various types of shallow foundation with neat figures. 07
2
Q.5 (a) A 30 cm diameter concrete pile is driven in normally consolidated clay 15m
thick. Estimate the safe load Take Cu=70 kN/m
2
?=0.9 and F.S. =2.5.
07
(b) A 10m long concrete pile is driven into a medium dense sand (?=30?, ?=20kN/m
3
,
k=1.0,tan ?=0.5) Take Dc/B=10.0. Estimate the safe load (F.S. =2.5)
07
OR
Q.5 A reinforced concrete pile weighing 30 kN (inclusive of helmet and dolly) is
driven by a drop hammer weighing 40 kN and having an effective fall of 0.8m.
The average set per blow is 1.4 cm. The total temporary elastic compression is
1.8 cm. Assuming the co-efficient of restitution as 0.25 and a factor of safety of
2, determine the ultimate bearing capacity and the allowable load for the pile.
14
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This post was last modified on 20 February 2020