GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII EXAMINATION — SUMMER 2020
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Subject Code: 2180609 Date: 27/10/2020Subject Name: Foundation Engineering
Time: 02.30 pm to 05.00 pm Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Define following terms; 03
Bearing capacity, Ultimate bearing capacity, Safe bearing capacity
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(b) Enlist the objectives of site exploration program. 04
(c) Describe the standard penetration test used in soil exploration, with 07
neat diagram. Comment on the correction factor for N- values for the
dry sand and submerged fine sand.
Q.2 (a) What are the assumptions made in the derivation of Terzaghi’s 03
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bearing capacity theory? Write the equation for the ultimate bearingcapacity.
(b) Explain the design criteria for satisfactory performance of 04
foundation.
(c) Determine the net allowable load and gross allowable load for a 07
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square footing of 1.75m side and 1.25m deep. The soil below having;y=16kN/m3, ¢’=18 kN/m* & @’=25°. Take factor of safety =3 & use
Terzaghi’s theory. The values of Nc¢’=14.8, Nq’=5.6, Ny’=3.2 for
@’=25".
OR
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(c) Enlist the factors affecting bearing capacity. Explain each factor in 07
detail.
Q.3 (a) Describe limitations of plate load test. 03
(b) Explain Feld’s rule for the efficiency of pile grouped with 3,4, 5 & 04
6 piles.
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(c) Draw neat sketch of gravity retaining wall with forces acting on it. 07
Discuss various stability checks for gravity retaining wall.
OR
Q.3 (a) Differentiate between general shear failure and local shear failure 03
with neat sketch.
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(b) Differentiate between the end bearing pile and friction pile. 04
(c) Why drainage in backfill of retaining wall is provided? Explain 07
different methods of providing drainage of retaining wall.
Q.4 (a) Discuss the characteristics of the expansive soils. 03
(b) Enlist the factors influencing the selection of piles. 04
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(c) A group of 9 piles, 9mlong is used as the foundation of column. The 07
piles are 30cm in diameter with centre to centre spacing 90cm. the
subsoil consists of clay with unconfined compressive strength
170kN/m?. Estimate safe load. Take factor of safety = 3, a = 0.55 &
Nc=9.
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OR
(a) Explain different identification tests for field identification of 03
soils.
(b) What is Negative skin friction? What is its effect on the pile? 04
(c) A square concrete pile 30cm x 30cm is driven into homogeneous sand 07
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layer, (@=30°, y=18 kN/m?) for a depth of 12 m. calculate the ultimateload. Take K=1.3, 6 =18°, Nq=29 & Critical depth = 15B.
Q.5 (a) Define geosynthetics. Enlist the major types of geosynthetics. 03
(b) Write short note on bentonite slurry. 04
(c) Explain different functions of geosynthetics, with neat sketches. 07
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OR
Q.5 (a) Explain different foundations systems of expansive soils. 03
(b) What is retaining wall? In which situations it is necessary? 04
(c) Describe measures required for treatment of expansive soils. 07
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