1. Your lab conducts direct shear tests shown in Table 1. Determine the peak and residual drained strength parameters.

2. For the same project, you are asked to determine an appropriate strength envelope using the CU triaxial test results in Figure 1.

Test No. 1 2 3 4 5 07 Initial Water Content, % Dry Density, pcf Saturation, % Void Ratio Height, in 70.9 71.8 72 56.91 56.93 56.47 97.6 98.9 98 1.96 1.96 1.99 1 1 1 71.9 57.27 99.9 1.95 1 71.9 56.83 98.7 1.97 1 Final Water Content, % Dry Density, pcf Void Ratio Height 52.7 68.78 1.453 0.827 46.6 41.6 74.98 79.44 1.25 1.124 0.759 0.711 39.6 84.52 0.996 0.678 35 92.07 0.833 0.617 Normal Stress, tsf 0.25 0.5 1 3 6 Max Shear Stress, tsf 0.1437 0.2473 0.458 0.6785 1.2447 Displacement, in 0.2271 0.2382 0.2382 0.2142 0.2352 Strain Rate, in/min 7.5e-005 8e-005 0.00017.5e-005 0.00014 Sample Type: Reconstituted using ERDC blenderized technique LL= 75 PL= 26 PI= 49 Specific Gravity: 2.704 Remarks: 1200 1200 1000 1000 0 0 0 0 800 800 Doo a Deviatoric stress (kPa) 600 *** o Excess pore water pressure (kPa) 600 ooo ** ** AAD 400 400 200 200 78889900 AAAA 0 0 2 6 1 3 4 5 Axial strain (%) OS 7 1 7 0 1 2 1 3 4 5 Axial strain (%) 6 8 A A 100 kPa = 200 kPa o 400 kPa * 600 kPa = 800kPa o 1000 kPa A 1200 kPa A 100 kPa 200 kPa o 400 kPa * 600kPa 800 kPa o 1000 kPa A 1200 kPa Test No. 1 2 3 4 5 07 Initial Water Content, % Dry Density, pcf Saturation, % Void Ratio Height, in 70.9 71.8 72 56.91 56.93 56.47 97.6 98.9 98 1.96 1.96 1.99 1 1 1 71.9 57.27 99.9 1.95 1 71.9 56.83 98.7 1.97 1 Final Water Content, % Dry Density, pcf Void Ratio Height 52.7 68.78 1.453 0.827 46.6 41.6 74.98 79.44 1.25 1.124 0.759 0.711 39.6 84.52 0.996 0.678 35 92.07 0.833 0.617 Normal Stress, tsf 0.25 0.5 1 3 6 Max Shear Stress, tsf 0.1437 0.2473 0.458 0.6785 1.2447 Displacement, in 0.2271 0.2382 0.2382 0.2142 0.2352 Strain Rate, in/min 7.5e-005 8e-005 0.00017.5e-005 0.00014 Sample Type: Reconstituted using ERDC blenderized technique LL= 75 PL= 26 PI= 49 Specific Gravity: 2.704 Remarks: 1200 1200 1000 1000 0 0 0 0 800 800 Doo a Deviatoric stress (kPa) 600 *** o Excess pore water pressure (kPa) 600 ooo ** ** AAD 400 400 200 200 78889900 AAAA 0 0 2 6 1 3 4 5 Axial strain (%) OS 7 1 7 0 1 2 1 3 4 5 Axial strain (%) 6 8 A A 100 kPa = 200 kPa o 400 kPa * 600 kPa = 800kPa o 1000 kPa A 1200 kPa A 100 kPa 200 kPa o 400 kPa * 600kPa 800 kPa o 1000 kPa A 1200 kPa