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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FOURTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: CE208
Course Name: GEOTECHNICAL ENGINEERING I

Max. Marks: 100 Duration: 3 Hours

b)

b)

b)

(Graph sheets may be supplied on request)
PARTA
Answer any two full questions, each carries 15 marks Marks

Define void ratio, porosity, air content and percentage of air voids. 5

An embankment having total volume of 2500 ‏“مر‎ is to be constructed having bulk 10
density of 1.98 gm/em* and placement water content of 18%. The soil is to be
obtained from either borrow area A or borrow area B which has void ratio of
0.78 and 0.69 respectively. The water contents of these areas 16% and 12%
respectively. If the cost of excavation is Rs. 36/17 from each area. The cost of
transportation is Rs.33 and Rs.37 per ന from borrow area A and borrow area ए
respectively. Which area is more economical? Take specific gravity of soils as
2.66.

With the help of particle size distribution graph, define the following (i) Well 5
graded soil (ii) poorly graded soil (iii) gap graded soil

The wet weight of the soil specimen having size 40 mm diameter and 80 mm_ 10
height is 1.6N. Its weight after 24 hrs of oven drying is 1.4N. Determine the
water content, dry unit weight, bulk unit weight, void ratio and degree of
saturation. The specific gravity of soil can be taken as 2.7.

Sketch the plasticity chart used for classifying a fine-grained soil. Classify the 7
soil as per IS classification system

Percentage of soil finer than 75-micron sieve = 14%

Percentage of soil finer than 4.75 mm sieve = 63%

Liquid limit = 28%

Plasticity index = 12%

An air-dried soil sample weighting 500 gm was sieved in the laboratory. The 8
results are given below. Draw the grain size distribution curve and find the
uniformity coefficient, coefficient of curvature, effective size, percentage of

gravel and percentage of sand.

Mass

retained
(gm)

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