Answered: Table 1 given below presents the…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.14P

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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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