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03000CE364052105

PART C

Answer any two full questions, each carries 20 marks.
What are the permissible limits of tilts and shifts? Describe any four methods to
prevent tilts and shifts.
With the help of neat sketch explain different components and functions of well
foundation.
List the steps involved in well sinking.
A group of 9 piles 400mm diameter and 12m long is arranged in a square pattern
is installed in a medium to dense sandy deposit of 13m thickness below which a
normally consolidated clay deposit of 3m thickness is found. The pile group
carries a load of 180011 in which 60% of the load is taken by skin friction.

Estimate the consolidation settlement of the clay layer, if it has got a liquid limit
of 55%, initial void ratio of 1.1.Water table is at ground level. १६ =18.5kN/m°

for sand and 2011/17” for clay.

List the different methods of construction of drilled piers and explain any one
method in detail.

A square pile group consisting of 16 piles of 40 cm diameter passes through two
layers of compressible soils. The thicknesses of the layers are : 1.1 = 2.5 m and 1.2
= 3 m. The piles are spaced at 100 cm center to center. The properties of the fill
material are: top fill cu = 25 124/2; the bottom fill (peat), cu = 30 2۰
Assume Y= 14 kN/m3 for both the fill materials. Compute the negative frictional
load on the pile group. Take adhesion factor 1.

With the help of equations define the terms thickness of well steining and grip
length.

Explain with a neat sketch, the basis of analysis of lateral stability of well

foundations.

TRB RR

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