Q. For a tri-axial shear test conducted on a sand specimen at a confining pressure of 100kN/m² under drained conditions, resulted in a deviator stress ($₁−$3) at failure of 100kN/m². The angle of shearing resistance of the soil would be
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- An undisturbed soil sample, 110 mm in diameter and 220 mm in height, was tested in atriaxial machine. The sample sheared under an additional axial load of 3.35 kN with avertical deformation of 21 mm. The failure plane was inclined at 50˚ to the horizontal and the cell pressure was 300 kN/m2. i. Draw the Mohr circle diagram representing the above stress conditions, and from it determine:− Coulomb’s equation for the shear strength of the soil, in terms of total stress;− the magnitude and obliquity of the resultant stress on the failure plane.An undisturbed soil sample, 100 mm in diameter and 200 mm high, was tested in a triaxial machine. The sample failed at an additional axial load of 3 kN with a vertical deformation of 20 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m2, Determine, from Mohr’s circle, the cohesion in kPa. a.117.8 b.91.3 c.125.6 d.87.2A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. Find the magnitude of the principal minor stress in kPa at failure for identical specimen of sand if it is tested under a cell pressure of 200 kPa. a.600 b.241 c.723 d.200
- A clayey soil has a drained angle of friction of 28° and cohesion of 30 kPa. In the triaxial test of the same sample, the maximum shearing stress is 70 kPa.1. Compute the all around pressure for failure to occur. a. 25.62 kPab. 28.62 kPac. 20.51 kPad. 22.68 kPa2. Calculate the normal stress at maximum shear. a. 86.51 kPab. 96.52 kPac. 46..51kPad. 92.68 kPa3. Determine the major principal stress at failure. a. 186.41 kPab. 136.52 kPac. 158.70 kPad. 162.68 kPaAn undisturbed soil sample, 100 mm in diameter and 200 mm high, was tested in a triaxial machine. The sample failed at an additional axial load of 3 kN with a vertical deformation of 20 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m2, Determine, from Mohr’s circle, the angle of friction. Pls include fbd.A dilatometer test (DMT) was conducted in a clay deposit. The water table was located at a depth of 3 mbelow theground surface. At 8 m depth the contact pressure (p1) was 280 kPa and the expansion stress (p2) was 350 kPa.Assume σo = 95 kPa at the 8 m depth and μ = 0.35. Determine (a) Coefficient of at-rest earth pressure Ko,(b) Overconsolidation ratio OCR and (c) Modulus of elasticity Es.
- A consolidated drained triaxial test was conducted on a granular soil. At failure (σ1^')/(σ3^' ) = 4.0. The effective minor principal stress at failure was 100 kN/m2. Compute the principal stress difference at failure in kPa. a. 100 b. 200 c. 300 d. 400 e. 500A sample of dry sand was tested in a direct shear device under a vertical pressure of 20 lb/in2 on the horizontal plane of shear. Failure occurred at a shearing stress of 14 lb/in2. Compute the angle of internal friction of the sand.A net contact pressure equals 160 kN/m2 is applied to a stiff clay layer 15 m thick. The footing is 6 m square founded at 2 m depth below ground surface. A layer of silty sand, 2 m thick, overlies the clay and a firm stratum lies immediately below the clay. Oedometer tests on specimens of the clay gave the value of mv =0 13 m2/MN, and triaxial tests gave the value of pore pressure parameter A = 0 35. The undrained Young’s modulus for the clay Eu was estimated equal 55 MN/m2. Determine the total settlement under the footing centre.
- A triaxial test conducted on cohesionless soil gives the following results: Deviator stress at failure = 410kPa The angle of shearing resistance = 32 degrees Determine the following: a. Confining pressure in kPa b. Shear stress at failure plane in kPa c. Angle that the failure plane makes with the principal plane (degrees)- The results of some drained triaxial tests on a clay soil are given below.Failure of each specimen was caused by increasing the axial stress while theradial stress was kept constant.(a) Determine ϕ for the soil(b) Determine Hvorslev’s parameter ϕc and ce at moisture content of 24.2,22.1, and 18.1%.A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. What would be the magnitude of the deviator stress in kPa at failure for identical specimen of sand if it is tested under a cell pressure of 200 kPa? a. 200 b. 241 c. 400 d. 600