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B4E542 Pages: 3

Reg. No. Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY FOURTH SEMESTER B.TECH
DEGREE EXAMINATION, JUNE 2017 CE208: GEOTECHNICAL ENGINEERING I (CE)

Max.Marks : 100 Duration : 3 Hours

1.

3.

(Assume any missing data, Graph sheets can be used.) PART A

Answer any two questions in full.
(a) Using phase diagram, define the terms (i) void ratio (ii) Degree of saturation (iii) water

content and (iv) specific gravity. (7)
(b) A partially saturated soil sample obtained from an earth fill has a natural water content
of 26% and unit weight 19.74 kN/ 73. Assuming specific gravity of solids is
2.68. Compute: (i) Degree of saturation (ii) void ratio (iii) porosity and (iv) air content.
(8)

(a) Sketch the plasticity chart used for classifying fine grained soil according to IS
classification system. Give the group symbol for the following soil according to IS
classification system

i) percentage of soil passing 75 micron sieve = 3% ii)

Percentage of coarse fraction passing 4.75 mm sieve = 70% iii)

Uniformity coefficient = 7

iv) Co efficient of curvature = 3 (7) (b) What is the
use of particle size distribution curve? With the help of particle size distribution curve define
the following terms (i) well graded soil (ii) poorly graded soil
(iii) gap graded soil and (iv) effective size. (8)
(a) Following are the results obtained from the liquid and plastic limit tests for a soil.

Observations of liquid limit:
No. of blows | Moisture content(%)

13
| 18 |
29

The plastic limit is 15.5%. (i) draw the flow curve and obtain the liquid limit (ii)

Determine the liquidity index of soil when the insitu moisture content is 18% (iii)

Plasticity index . (7)
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