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Homework_17

# Homework_17 - d Determine the preconsolidation pressure...

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CEEN 641 – ADVANCED SOIL MECHANICS HOMEWORK ASSIGNMENT #17 1. The following results were obtained from a one-dimensional consolidation test: Pressure ( σ z ), kPa Specimen height at end of consolidation, mm 10 24.618 25 24.321 50 24.082 100 23.622 200 22.629 400 21.186 800 19.802 1600 18.362 800 18.522 400 18.829 200 19.035 100 19.263 The specimen has the following characteristics: initial height = 25.400 mm, diameter = 63.508 mm, Gs = 2.70, and dry mass = 97.8 g. Do the following: a. Determine the initial void ratio (to three decimal places) b. Plot the consolidation curve in terms of void ratio (e) versus logarithm of pressure (log p’) c. Plot the consolidation curve in terms of percent vertical strain ( ε %) versus logarithm of pressure (log p’)
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Unformatted text preview: d. Determine the preconsolidation pressure using Casagrande’s method e. Determine the compression index (c c ) from the laboratory consolidation curve f. Determine the compression ratio (c’ c = c c ε = CR) from the laboratory consolidation curve g. Determine the recompression index (c r ) from the laboratory consolidation curve h. Determine the recompression ratio (c’ r = c r ε = RR) from the laboratory consolidation curve i. Determine the modulus of volume compressibility for loading (not unloading) compatible with σ ’ z = 800 kPa; explain how this parameter is similar and yet different to the compression ratio j. Determine the constrained modulus of elasticity for loading (not unloading) compatible with σ ’ z = 800 kPa...
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