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Posted By: A santhosh Member Level: Diamond Posted Date: 29 Sep 2008
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2006 Jawaharlal Nehru Technological University Civil Engineering IV B.Tech II Semester Regular Examinations, Apr/May 2006,ADVANCED FOUNDATION ENGINEERING Question paper
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Code No: RR420101 Set No. 3
IV B.Tech II Semester Regular Examinations, Apr/May 2006
ADVANCED FOUNDATION ENGINEERING
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What are the differences between Terzaghi, Meyerhof and Hansen bearing
capacity theories? Discuss in detail.
(b) A wall footing has width and depth of 1.2m and 0.8m respectively, while the
surrounding soil has ? = 19kN/m3, cu = 48kN/m2 and ; = 200. Determine
the ultimate bearing capacity of the footing by Meyerhof’s method. Given
Nc= 14, Nq= 6.7 and N
= 2.8. [10+6]
2. (a) How does the settlement of a footing influence its design and how can a de-
signer take into consideration the settlement of a footing?
(b) A footing 1.5m square is located 1.5m below the surface of a uniform soil de-
posit of density 20 kN/m3. The void ratio of the soil is 0.8 and its compression
index is 0.07. If the total thickness of the deposit, which is underlain by rock
strata, is 3.5m, compute the primary consolidation settlement of the footing
when it carries a load of 225 kN. Use 2:1 ratio stress distribution method and
consider four layers. [8+8]
3. (a) Discuss the elastic settlement of pile groups in sandy soils.
(b) What inputs are required for the estimation of settlement of a group of friction
piles in clay? Mention the assumptions made. [8+8]
4. (a) What is downward drag force? How to determine the downward drag force of
piles?
(b) A bored pile with enlarged base is to be installed in a stiff clay, the undrained
shear strength at base level being 220 kN/m2. The saturated unit weight of
the clay is 21 kN/m3. The diameters of the pile shaft and base are 1.0m and
3.0m respectively. The pile extends from a depth of 4m to a depth of 22m,
the top of the under-ream being at a depth of 20m. Past experience indicates
that a skin friction coefficient of 0.70 is appropriate for the clay. Compute the
allowable load on the pile to ensure
i. an overall load factor of 2, and
ii. a load factor of 3 under the base, when shaft resistance is fully mobilized.
[6+10]
5. (a) Explain the design principles, with neat sketches showing typical reinforcement
in design of
i. Well cap
ii. Well steining
iii. Well curb
iv. Bottom plug
(b) Briefly explain the sinking operation of a well foundation. [10+6]
6. Discuss the method of designing a cantilever sheet pile wall in cohesive soils. [16]
7. (a) What are the factors influencing the swell pressure of soil?
(b) What are the tests available to determine the swell pressure of an expansive
soil and explain any one of them very clearly? [8+8]
8. (a) Explain the concept of CNS layer used in the foundations of black cotton soils.
(b) How to fix the number of bulbs in under-reamed piles? Discuss.
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