Analytical Chem Soil HW Solutions 48

Analytical Chem Soil HW Solutions 48 - A B: reloading,...

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48 A – B: reloading, “elastic” (recoverable) deformation only B: maximum previous preconsolidation pressure, sample moves onto normal (first) compression line B – C: normal (first) compression: “elastic” plus plastic (irrecoverable) deformation. Plastic deformation is due to particle slip C – D: unloading; “elastic” component of deformation is recovered The soil is overconsolidated along AB and CD, and normally consolidated along BC. The slope of the reloading and unloading lines is – κ 0 ; the slope of the one-dimensional normal compression line is - λ 0 From the graph or the data, 035 . 0 50 ln 100 ln 639 . 1 590 . 1 ' ln = = Δ Δ = v o v σ (the slope of the unloading line), and 094 . 0 100 ln 200 ln 590 . 1 525 . 1 ' ln = = Δ Δ = v o v (the slope of the one dimensional normal compression line). (c) The initial vertical effective stress at the centre of the clay layer is approximately (20 kN/m 3 × 5 m) – (10 kN/m 3 5 m) = 50 kPa. The vertical effective stress is then increased
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.

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