Lecture 5 - 9 Review of Consolidation (Oedometer) Test o...

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ρ 9 Review of Consolidation (Oedometer) Test o Objective to determine the following parameters: 1. C C = - Δ e / Δ log σ V = - Δ e / log (p 2 /p 1 ) 2. C R = - Δ e / Δ log σ V = - Δ e / log (p 2 /p 1 ) = C e (e xpansion) = C S (s well ) 3. σ C = p C (F / L 2 ) 4. c v = T (H/N) 2 / t (L 2 / T) 5. C α = - Δ e / Δ log t = - Δ e / log (t 2 /t 1 ) o One-dimensional (constrained) test: measure 1-D deflection under vertical load o Test Procedure: 1. Prepare and saturate soil specimen, typical height H=1” and diameter=2.5”. 2. Apply load increment Δ p every 24 hrs following geometric progression, e.g. ¼, ½, 1, 2, 4, 8, 16, 32 tsf Note: Both the load sequence and duration of loading affect the results. 3. Read dial gage deflection R for each load following geometric progression, e.g. ¼, ½, 1, 2, 4, 8, 15, 30, 60, 120, 240, 480, 720, 1440 min Rigid Ring Soil Specimen Load, Δσ V or p Porous Stone Porous Stone Dial Gage Reading, R Water Bath
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ρ 10 4. Plot dial gage readings R vs. log time for each load and fit a smooth curve for analysis. Calculate C v and C α using the Casagrande construction: a) Find R 0 : choose t 1 , calculate t 2 = t 1 /4, measure vertical distance “a” on curve from t 1 to t 2 , R
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This note was uploaded on 09/12/2011 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 5 - 9 Review of Consolidation (Oedometer) Test o...

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