Table 1 given below presents the results of a conventional oedometer consolidation test conducted on a saturated clay sample with an initial height (thickness) and void ratio of H, = 20 mm and e, = 0.866, respectively. (a) Plot the consolidation curve in the semi-logarithmic space of void ratio and effective stress (or e-logo'). Determine the compression index C, recompression index C, and swell/rebound index C,. (b) Determine the past maximum effective stress (or pre-consolidation pressure) using the (maximum curvature) graphical method. (c) Determine the coefficient of compressibility m, for each of the loading/unloading stages.
Table 1 given below presents the results of a conventional oedometer consolidation test conducted on a saturated clay sample with an initial height (thickness) and void ratio of H, = 20 mm and e, = 0.866, respectively. (a) Plot the consolidation curve in the semi-logarithmic space of void ratio and effective stress (or e-logo'). Determine the compression index C, recompression index C, and swell/rebound index C,. (b) Determine the past maximum effective stress (or pre-consolidation pressure) using the (maximum curvature) graphical method. (c) Determine the coefficient of compressibility m, for each of the loading/unloading stages.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Table 1 given below presents the results of a conventional oedometer consolidation test conducted on
a saturated clay sample with an initial height (thickness) and void ratio of H, = 20 mm and e, = 0.866,
respectively.
(a) Plot the consolidation curve in the semi-logarithmic space of void ratio and effective stress (or
e-logo'). Determine the compression index C., recompression index C, and swell/rebound index C,.
(b) Determine the past maximum effective stress (or pre-consolidation pressure) using the
(maximum curvature) graphical method.
(c) Determine the coefficient of compressibility m, for each of the loading/unloading stages.
(d) Using the data provided in Table 2, which shows the relationship between displacement and
time for the loading stage 160 kPa → 320 kPa, determine the coefficient of consolidation C, (using
both methods discussed in the class) and the coefficient of permeability k for this loading stage.
Table 2
Time, t (min) | Displacement, d (mm)
Table 1
0.389
0.10
0.407
Type Stage, n Effective Stress, o' (kPa) | Displacement, d (mm)
0.25
0.416
0.000
0.50
0.427
1
20
0.024
1
0.443
2
40
0.140
2
0.465
3
80
0.251
4
0.498
4
160
0.389
8
0.541
320
0.871
16
0.601
6
640
1.821
32
0.672
7
1280
2.829
60
0.734
320
2.551
120
0.779
80
2.175
240
0.812
10
20
1.751
480
0.840
11
0.699
1440
0.871
Unloading
Buipeo7
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