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03000CE364052105

footing at the centre, assuming it to be (i) a flexible footing (ii) a rigid footing.
Given that I; 1.52 fora flexible footing and 1.20 for a rigid footing.
Explain the concept of floating foundation with neat sketch.
PART ‏تا‎

Answer any two full questions, each carries 15 marks.
A 12m long 300mm diameter pile is driven in a uniform deposit of sand (ம்‌ =
40°). The water table is at a great depth and not likely to rise. The average dry
unit weight of sand is 181/17". Take Ng = 137. Calculate the safe load capacity
of the pile with a factor of safety of 2.5. Use IS code method. K=2 and d=
What are undreamed piles? What are the applications of under reamed piles?
A concrete pile of 45 cm diameter is driven through a system of layered soils.
The length of the pile is 15m. The following data are available. The water table
is close to the ground surface.
Top layer 1: Soft clay, thickness = 9m, unit cohesion Cy = 30kN/m? and
adhesion factor a = 0.90.
Layer 2: Medium stiff, thickness = 4m, C, = 50kN/m? and a = 0.75.
Layer 3: Stiff stratum extends 10 a great depth, ಲೃ = 110kN/m’ and a = 0.50.
Compute Q, and Q, with factor of safety 2.5.
Write the detailed procedure to separate point resistance and skin friction
resistance from the cyclic pile load test data.
The following data refers to a pile load test carried out on a 300mm diameter and

10 m long pile.

Total settlement of

pile top (mm)

Net settlement of pile | 0.40 | 0.65 ⋅ 1.0 1.70 | 5.25 | 22.80
top (mm)

Plot the load settlement curve and estimate the allowable load of the pile as per
Indian Standard Code of Practice.

Differentiate between CRP and MLT related to pile load testing.

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