Answer Happy

In an oedometer test on a specimen of saturated clay (Gs= 2.72)
the applied pressure was
2
increased from 107 to 214 kN/m
and the following compression readings recorded:
Time 1 1 1 1
(min) Gauge (mm) Time (min) Gauge (mm)
0 -
- 1 24 4 6- 9 16 424
7.82 7.42 7.32 7.21 6.99 6.78 6.61 6.49 6.37 25 36 49
64 81 100 300 1440
6.29 6.24 6.21 6.18 6.16 6.15 6.10 6.02
After 1440 min the thickness ofthe specimen was 15.30 mm and the
water content was 23.2%.
a) Detennine the values of the coefficient of
consolidation and coefficient of secondary compression from
the log time plot. Indicate initial compression, primary
consolidation and secondary compression on the plot. (10
marks)
b) Determine also the values o f the coefficient o f
volume compressibility and the
Question A3 (15 marks) In an oedometer test on a specimen of saturated clay (G, = 2.72) the applied pressure was increased from 107 to 214 kN/m² and the following compression readings recorded: 1 0 1 2 1 1 2 4 4 1 6 9 16 4. 7.82 7.42 7.32 7.21 6.99 6.78 6.61 6.49 6.37 Time (min) Gauge (mm) Time (min) Gauge (mm) 25 36 49 64 81 100 300 1440 6.29 6.24 6.21 6.18 6.16 6.15 6.10 6.02 After 1440 min the thickness of the specimen was 15.30 mm and the water content was 23.2%. a) Determine the values of the coefficient of consolidation and coefficient of secondary compression from the log time plot. Indicate initial compression, primary consolidation and secondary compression on the plot. (10 marks) b) Determine also the values of the coefficient of volume compressibility and the coefficient of perineability. (5 marks)