kindly do it asap Two triaxial compression tests are conducted on identical spec
ID: 1732578 • Letter: K
Question
kindly do it asap
Two triaxial compression tests are conducted on identical specimens of the same saturated clay. In the first test the soil is first consolidated to 01-350 kPa and uo-200 kPa and then sheared under drained conditions increasing the axial stress while keeping the chamber pressure constant. At failure ?i-560 kPa. In the second test, the specimen is consolidated to de-600 kPa and uo-400 kPa, then it is sheared under undrained conditions increasing the axial stress while keeping the chamber pressure constant. At failure (?-c)-130 and the excess pore pressure ??-107 kPa. Draw the total and effective Mohr circles at failure for the two specimens and determine the Mohr-Coulomb strength parameters (c' and e). Do you believe this clay is normally or overconsolidated?Explanation / Answer
First Test : For Mohr circle plot, on X axis sigma i.e, normal stress. We have to plot 2 circles..one for total stress and other for effective stress.
Total stress Circle : sigmc =sigma3 = 350 , sigma1 = 560 kPA. Plot these 2 points on horizontal axis and then draw circle passiing through these 2 points...
Effective stress circle : sigmac'=sigma3'=350-200=150 kPa, sigma1'=560-200=360 kPA...Plot these 2 points on horizontal axis and then draw circle passiing through these 2 points...
Plot tangent to effective stress circle passing through origin based on assumption that this is normally consolidated soil.
Second Test :
Total stress circle : sigmac=sigma3=600 kPa, sigma1=600+130=730kPa...Plot these 2 points on horizontal axis and then draw circle passiing through these 2 points...Plot tanget which is horizontal line and intersects with vertical..This will give you Cu=65 kPA which is generally not observed for overconsolidated clay.
Effective stress circle : sigmaC'=600-400=200 kPA, sigma1'=730-400-107=223 kPA...Plot circle.
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