Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 8th Sem New 2180609 Foundation Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2180609 Date:15/05/2019
Subject Name:Foundation Engineering
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) Answer the following. 03
1 Define: ultimate bearing capacity of soil mass.
2 What is a significant depth?
3 As the cohesion decreases, adhesion increases. (True/False)
(b) Give the classification of shallow foundations and deep foundations. 04
(c) Determine the gross safe load that can be carried out by a square footing
of size 2.2 m x 2.2 m , placed at a depth of 1.6 m below ground level. The water
table is at a great depth. Foundation soil has the properties: ?d =16.5 kN/m
3
, ? =
20?, Nc' = 11.8, Nq' = 3.8, Nr' = 1.3. C = 11 kN/m
2
. Assume F.S. = 2.5.
07
Q.2 (a) What is the effect of increase in width of a footing on bearing capacity of a
footing resting on (a) sand and (b) clay?
03
(b) What are the engineering tests usually conducted to assess the swelling potential
of an expansive soil. Discuss any one of them.
04
(c) What are the objectives of a soil investigation program? List the various methods
of soil investigation. What is a bore log?
07
OR
(c) Differentiate between flexible pavement and rigid pavement. Describe briefly the
various methods for design of flexible pavement.
07
Q.3 (a) What are the limitations of dynamic pile load formulas? 03
(b) Determine the area ratio for the following soil samplers and comment on the
nature of the samples obtained.
(i) Core cutter : 165 mm outer diameter, 150 mm inner diameter.
(ii) Seamless tube (Shelby) : 51 mm outer diameter, 48 mm inner diameter.
04
(c) Explain the Skempton's analysis for a clayey soil in detail. 07
OR
Q.3 (a) What are the different circumstances under which a pile foundation is used? 03
(b) Comment on the following statements:
1. Settlement of a group of vertical piles is usually more than that of a single
pile under equal axial load.
2. The principal effect of negative skin friction is to reduce factor of safety.
04
(c) Write step by step procedure to perform standard penetration test in the field.
How it differs from plate load test?
07
Q.4 (a) Explain the functions of (i) Batter pile (ii) Fender pile. 03
(b) Write assumptions made in the Terzaghi's theory of bearing capacity. 04
(c) A square pile group of 9 piles was driven in to soft clay extending to a large
depth. The diameter and length of the piles were 30 cm and 9 m respectively. If
the unconfined compressive strength of clay is 90 kN/m
2
and pile spacing is 90
cm centre to centre, what is the capacity of the group? Assume F.S. = 2.5 and
adhesion factor ? = 0.75.
07
OR
Q.4 (a) Which are the various parameters used for identification of expansive soil? 03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2180609 Date:15/05/2019
Subject Name:Foundation Engineering
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) Answer the following. 03
1 Define: ultimate bearing capacity of soil mass.
2 What is a significant depth?
3 As the cohesion decreases, adhesion increases. (True/False)
(b) Give the classification of shallow foundations and deep foundations. 04
(c) Determine the gross safe load that can be carried out by a square footing
of size 2.2 m x 2.2 m , placed at a depth of 1.6 m below ground level. The water
table is at a great depth. Foundation soil has the properties: ?d =16.5 kN/m
3
, ? =
20?, Nc' = 11.8, Nq' = 3.8, Nr' = 1.3. C = 11 kN/m
2
. Assume F.S. = 2.5.
07
Q.2 (a) What is the effect of increase in width of a footing on bearing capacity of a
footing resting on (a) sand and (b) clay?
03
(b) What are the engineering tests usually conducted to assess the swelling potential
of an expansive soil. Discuss any one of them.
04
(c) What are the objectives of a soil investigation program? List the various methods
of soil investigation. What is a bore log?
07
OR
(c) Differentiate between flexible pavement and rigid pavement. Describe briefly the
various methods for design of flexible pavement.
07
Q.3 (a) What are the limitations of dynamic pile load formulas? 03
(b) Determine the area ratio for the following soil samplers and comment on the
nature of the samples obtained.
(i) Core cutter : 165 mm outer diameter, 150 mm inner diameter.
(ii) Seamless tube (Shelby) : 51 mm outer diameter, 48 mm inner diameter.
04
(c) Explain the Skempton's analysis for a clayey soil in detail. 07
OR
Q.3 (a) What are the different circumstances under which a pile foundation is used? 03
(b) Comment on the following statements:
1. Settlement of a group of vertical piles is usually more than that of a single
pile under equal axial load.
2. The principal effect of negative skin friction is to reduce factor of safety.
04
(c) Write step by step procedure to perform standard penetration test in the field.
How it differs from plate load test?
07
Q.4 (a) Explain the functions of (i) Batter pile (ii) Fender pile. 03
(b) Write assumptions made in the Terzaghi's theory of bearing capacity. 04
(c) A square pile group of 9 piles was driven in to soft clay extending to a large
depth. The diameter and length of the piles were 30 cm and 9 m respectively. If
the unconfined compressive strength of clay is 90 kN/m
2
and pile spacing is 90
cm centre to centre, what is the capacity of the group? Assume F.S. = 2.5 and
adhesion factor ? = 0.75.
07
OR
Q.4 (a) Which are the various parameters used for identification of expansive soil? 03
2
(b) Differentiate between diaphragm walls and sheet pile walls 04
(c) What do you understand by contact pressure? On which factors it depends? Draw
contact pressure distribution diagram for flexible and rigid footings on sand and
clayey soil.
07
Q.5 (a) Explain the importance of drainage for backfill in retaining wall 03
(b) Classify the geosynthetic materials and explain any two of them. 04
(c) What is the ?active zone? in black cotton soil? Explain the properties of black
cotton soil.
07
OR
Q.5 (a) What are the field conditions that generally favours swelling in an expansive soil? 03
(b) Draw an under reamed pile with detailed configuration. 04
(c) Discuss the requirements which must be satisfied for the safe design of a
retaining wall.
07
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This post was last modified on 20 February 2020