Homework_16

Homework_16 - CEEN 641 ADVANCED SOIL MECHANICS HOMEWORK...

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CEEN 641 – ADVANCED SOIL MECHANICS HOMEWORK ASSIGNMENT #16 1. A soil profile consists of recent alluvial materials overlying a soft lacustrine clay. A field and laboratory investigation was undertaken to define shear strength parameters for the clay. Through a series of consolidation tests, a preconsolidation stress ( σ vm = σ p ) profile was developed. This profile is shown below, together with a vertical effective stress profile ( σ vo ). Preconsolidation Vertical Effective Depth (ft) Stress (psf) Stress (psf) 10.5 6800 1080 13.0 5810 1440 15.5 5110 1555 18.0 4580 1699 23.0 3820 1958 25.5 3540 2074 A series of CK o U triaxial compression tests was also performed, producing the following data. Consolidation Vertical Effective Deviator Stress at Stress, σ vm (psf) Stress, σ vc (psf) Failure, ( σ 1 σ 3 ) f (psf) 13820 13820 8707 8640 4320 5141 8640 2160 4272 8640 1440 4026 a. Construct a plot of S u / σ vc versus OCR on a log-log plot and determine the “S”
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