Analytical Chem Soil HW Solutions 80

Analytical Chem - Vt 15.5 cm3 Prediction of triaxial state paths using the Cam clay model Q5.8(a Describe by means of an annotated diagram the main

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80 Δ V t 15.5 cm 3 Prediction of triaxial state paths using the Cam clay model Q5.8 (a) Describe by means of an annotated diagram the main features of the conventional trixial compression test apparatus. (b) A sample of London Clay is prepared by isotropic normal compression in a triaxial cell to an average effective stress p' = 400 kPa, at which point its total volume is 86 × 10 3 mm 3 . The drainage taps are then closed and the sample is subjected to a special compression test in which the cell pressure is reduced as the deviator stress is increased so that the average total stress p remains constant. Sketch the state paths followed, in the q,p', q,p and v,lnp' planes. Give values of cell pressure, q, p, u, p' and specific volume v at the start of the test and at failure. (You must also calculate some intermediate values in order to sketch the state paths satisfactorily.) How do the values of undrained shear strength τ u and pore water presure at failure compare with those that would have been measured in a conventional compression test?
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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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