Reg No.:

Max. Marks: 100

02000CE208052002

Pages: 3

Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fourth semester B.Tech examinations (S), September 2020

Course Code: CE208
Course Name: GEOTECHNICAL ENGINEERING I (CE)

Duration: 3 Hours

(Assume suitable data whereever necessary. Graph sheets may be supplied on request)

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PARTA

Answer any two full questions, each carries 15 marks
Explain with a neat sketch the three phase diagram for soil. Define air content
and percentage air voids with the help of phase diagram.
Derive from the first principle the expression y»=((G+Se)yw)/(1+e).
Calculate the void ratio and dry density of the soil sample with 25% prorosity if
the specific gravity is 2.75.
The insitu density of soil is 16kKN/m*. The weight of soil filled in a one litre
container in its loosest state and densest state are 1514 and 17N respectively.
What is the density index of the soil? G =2.67
The plastic limit and plasticity index of the soil are 13% and 10 respectively. If
the natural water content of the soil is 18%. Determine the following.
a) Liquid Limit b)Liquidity Index c) Consistency Index
Define uniformity coefficient and coefficient of curvature and its importance.
A partially saturated sample from a borrow pit has a natural water content of
14% and bulk unit weight of 19kN/m*. The specific gravity of solids is 2.70.
Determine the void ratio and degree of saturation. What will be the unit weight
of the sample on saturation?
Define Stoke's law and its limitations.
Classify the soil with justifications; Cu=7, Cc=2, % Gravel =20%, % Sand
=715%.

PART ‏تا‎

Answer any two full questions, each carries 15 marks
Define i)Effective stress 11) Quick Sand Condition iii)Phreatic Line
A 8m thick soil profile consists of 5m depth sand layer above a 3m depth clay

layer. The water table is at 3m below the ground level. The sand above water

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