Tuesday, December 4, 2012

Important Questions In CE2305 Foundation Engineering For Nov/Dec 2012 Anna University,Chennai Examination

Anna University, Chennai Nov/Dec 2012 Examinations
Rejinpaul.com Important Questions
CE2305 Foundation Engineering
Unit I-V
1.     Explain dynamic cone penetration test
2.     Explain with neat sketch auger boring method of soil exploration
3.     Describe the types of samplers with neat sketch.
4.     Explain any two methods of site exploration in detail?
5.     Explain different types of shear failures of soil with neat sketch
6.     Size of an isolated footing is to be limited to 1.5 metres square. Calculate the depth at which the footing should be placed to take a load of 200 kN, with a factor of safety 3. The soil is having angle of internal friction _ = 30o. The weight of the soil is 21 kN/m3. Bearing capacity factor for _ = 30o, Nq=22 and N_ = 20.
7.      What is bearing capacity? What are the factors affecting bearing capacity? what are improving factors of bearing capacity?
8.     Explain Terzaghi’s analysis of bearing capacity of soil in general shear failure
9.     A footing rests at a depth of 1m has a size of 3m x 1.5m and it causes a pressure increment of 200 kN/m2 at its base. The soil profile at the site consists of sand for the top 3 m, which is underlined by a clay layer of 3m. Water table is at a depth of 2.5m from the ground surface. The unit weight of sand layer above and below water table are 16kN/m3 and 18 kN/m3 respectively. The unit weight of clay is 15 kN/m3. The initial void ratio is 0.8 and compression index is 0.3. Determine the consolidation settlement at the middle of the clay layer. Assume 2:1 pressure distribution and consider the variation of pressure across the depth of the clay layer
10.What are the different types of raft foundations?
11. Briefly explain how proportioning and structural design of trapezoidal combined footing is done with diagram
12.Briefly explain about the structural design of spread footing
13. What are different types of piles and their functions in detail
14.A group of 16 piles of 50 cm diameter is arranged with a center to center spacing of 1.0 m. The piles are 9m long and are embedded in soft clay with cohesion 30kN/m. Bearing resistance may be neglected for the piles. Adhesion factor is 0.6. Determine the ultimate load capacity of the pile group.
15. What are the various factors influencing the selection of pile?
16.What are group capacity by different method
17. Explain the active and passive states of earth pressure acting on a retaining wall
18.A masonry retaining wall of trapezoidal section has its top width equal to 0.75 m and height 6m. Its face which is in contact with the retained earth is vertical. The earth retained is level at top. The soil weighs l6 kN/m3 and its angle of friction is 30°. The masonry weighs 24 kN/m3. Determine the minimum width of the base to avoid tensile stresses and determine the maximum compressive stress for this base width. If the coefficient of friction between the base and the soil is 0.60 m, check the stability of the retaining wall against sliding
19.Explain the Rebhann’s graphical method and Culmann’s graphical method in detail
20.            Explain the Rankine’s theory for various backfill condition to calculate active state earth pressure