Download GTU BE/B.Tech 2018 Winter 8th Sem New 2180609 Foundation Engineering Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018

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Subject Code: 2180609 Date: 26/11/2018
Subject Name: Foundation Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Define bearing capacity, gross bearing capacity and net bearing 03
capacity.
(b) Classify the different methods to determine bearing capacity of 04

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soil.
(c) A strip footing of width 3m is founded at a depth of 2.2m below 07
the ground surface in a c-φ soil having cohesion 30 kN/m² and
angle of internal friction 32°. The water table is at a depth of 5m
below ground surface. The moist soil above the water table is 17

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kN/m³. Determine the safe bearing capacity and safe load per m
length of the footing. Consider factor of safety is 3 and take bearing
capacity factor Nc = 57.8, Nq =41.4 and Nγ =42.4.

Q.2 (a) Differentiate between disturbed and undisturbed soil sample. 03
(b) What is site investigation? What are the purpose of site 04

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investigation?
(c) Describe the standard penetration test. How the observed N-value 07
is corrected?

OR

(c) Enlist the different geophysical method. Explain any one in detail 07

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with its limitations.

Q.3 (a) What are the necessity of pile foundation? 03
(b) Classify the piles on the basis of their function with sketches. 04
(c) A group of 9x9 piles, 9 m long is used as the foundation of 07
column. The piles are 30cm in diameter with centre to centre

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spacing 90cm. The subsoil consists of clay with unconfined
compressive strength 160 kN/m² Estimate safe load considering
factor of safety as 3.

OR

Q.3 (a) What are the advantages of steel pile, timber pile and composite 03

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pile?
(b) Differentiate between end bearing pile and friction pile. 04
(c) A drop hammer weighing 55kN and having an effective fall of 07
0.70m drives an RCC pile weighing 35kN. The average settlement
per blow is 1.3cm. The total temporary elastic compression is

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1.7cm. Assuming coefficient of restitution as 0.25 and factor of
safety 3.0, determine ultimate bearing capacity and allowable
bearing capacity.

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Q.4 (a) What is CNS layer? Explain concept of CNS layer. 03

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(b) What are the different type of the foundation provided on 04
expansive soil? Draw the detail sketch of any one foundation.
(c) Explain different function of geosynthetics in detail with figures. 07

OR

Q.4 (a) Define collapsible soil. How it is identified? 03

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(b) Draw the typical collapsible soil structure. 04
(c) What are the different application area of geosynthetics? Explain 07
each application in detail.

Q.5 (a) Name the different forces act on retaining wall. 03
(b) Name the types of retaining wall. Draw any two figures by 04

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showing all parts of the retaining wall.
(c) Explain construction method of sheet pile wall. 07

OR

Q.5 (a) What are the application of retaining wall? 03
(b) Prepare short note on drainage of the backfill. 04

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(c) Describe in detail construction of the diaphragm wall. 07

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