Analytical Chem Soil HW Solutions 68

Analytical Chem Soil HW Solutions 68 - Μ , λ , κ and φ...

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68 Determination of critical state and Cam clay parameters Q5.4 Define in terms of principal stresses and the quantities measured during a conventional undrained compression test the parameters q, p and p'. Data from both consolidation and shear stages of an undrained triaxial compression test on a sample of reconstituted London clay are given below. Plot the state paths followed by the sample on graphs of q against p', q against p and v against lnp', and explain their shapes. CP,kPa 50 100 200 150 150 150 150 150 q, kPa 0 0 0 0 21 39 61 86 u, kPa 0 0 0 0 7 13 43 82 v 2.228 2.116 2.005 2.023 2.023 2.023 2.023 2.023 CP: cell pressure q: deviator stress u: pore water pressure v: specific volume Stating clearly the assumptions you need to make, estimate the soil parameters
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Unformatted text preview: Μ , λ , κ and φ ' crit . [University of London 2nd year BEng (Civil Engineering) examination, Queen Mary and Westfield College] Q5.4 Solution q = deviator stress = σ 1 – 3 = ' 1- ' 3 q = the ram load Q divided by the current sample area A. In an undrained test the total volume V t is constant = A .h = A.h = A.h .(1 – ε ax ) where ax is the axial strain Δ h/h , hence A = A /(1 – ax ) and q = Q.(1 – ax )/A p = average total stress = 1 / 3 ( 1 + 2 + 3 ) p' = average effective stress = p – u u = pore water pressure (measured); 2 = 3 = cell pressure CP (measured); 1 = cell pressure CP + q, so p = CP + q/3 The processed data (to obtain p' and lnp') are tabulated below...
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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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