he data shown in the table below were obtained in two triaxial compression tests on identical soil samples.
Sample No. |
Minor Principal Stress (kPa) |
Major Principal Stress (kPa) |
1 |
60 |
130 |
2 |
100 |
200 |
1) Draw the Mohr circle for these tests on graph paper. On your plot, (i) show the scale that you have chosen, and (ii) clearly label the axes with appropriate variable names and units.
2) Draw the Mohr-Coulomb strength envelope on the plot prepared in part (a).
3) Graphically estimate the friction angle, the cohesion, and the angle of the failure plane for Sample 2 and enter your answers in boxes 1,2, and 3 below. Type answers to the nearest whole number.
4) Based on the data provided, analytically calculate the friction angle, the cohesion, and the angle of the failure plane for tested samples and enter your answers in boxes 4,5, and 6 below. Show all work for these calculations. Type your answers to 3 significant figures.
5) Based on you answers from Part 4, if a sample of soil was tested in a direct shear test under a normal stress of 50 kPa what would be the expected shear strength? Enter your answer into box 7 using 3 significant figures.