A vane shear test was conducted in a saturated soft clay, using a 100 mm x 140 mm vane. When the vane was rotated at the standard rate of 0.1°/s, the torque measured in the torque meter increased to 60 N. m, and with further rotation reduced to 35 N. m. Determine the peak and residual undrained shear strengths of the clay. (Enter your answers to three significant figures.) Peak undrained shear strength = ☐ Residual undrained shear strength = kN/m² kN/m²

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Solve this problem graphically and then analytically. A CU triaxial test was performed on a dense sand specimen at a confining pressure 03=40 kPa. The consolidated undrained friction angle of the sand is =39°, and the effective friction angle is d'=34°. Calculate: (a) the major principal stress at failure, o1, (b) the minor and the major effective principal stresses at failure, o'3f and oʻır, and (c) the excess pore water pressure at failure, (Aua)f.

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A series of direct shear tests have been performed on a soil, using a circular shear box witha diameter D = 2.5 in. The data from these tests, in terms of normal force applied and maximum shearforce at failure, are listed below. Calculate the normal stress and the shear stress at failure in each test,graph the results on a σ−τ max plot and determine the cohesion and friction angle of this soil. Plot toscale, show units, and make sure to use the same scale for both axes.

Can TRIAXIAL TESTS be performed on sand samples? Briefly explain. The results of an undrained triaxial test on a clay soil sample are given in table below Cell Pressure (kN/m2) 200 400 600 Additional Axial Load at Failure (N) 342 388 465 Each sample, originally 76mm long and 38mm in diameter, experienced a vertical deformation of 5.1mm.  Evaluate the stress at failure for each cell pressure given in table above. Draw Mohr Circles and determine the shear strength parameters of the soil.

Q # 3. Following data are given for a direct shear test conducted on dry sand: Specimen dimensions: 63 mm x63 mm and 25 mm (height). Normal stress: 105 kN/m?. Shear force at failure: 300 N a. Determine the angle of friction, for a normal stress of 180 kN/m?. b. What shear force is required to cause failure?

Results of a shear box test are presented in Table 2. Shear stress (kN/m²) Normal stress (kN/m²) Table 2: Shear box test results 155 117 292 200 Determine the shear strength parameters, c and þ. What is the main limitation of the shear box test? 430 296 ч Lex N x

Problem 3: A vane shear test was conducted on a soft clay. The vane was 112 mm in height and 70 mm in diameter. It was pressed and fully penetrated into the clay with an applied torque, T. The test gave a result of corrected undrained shear strength of 34.65 kPa with a liquid limit of the soil equal to 60 and a plastic limit of 25. Determine the following: a) the torque T applied b) the unconfined compressive strength of clay c) the unconfined compression strength of clay in the remolded state if the soil sample has a sensitivity of 3.5.