In a tri-axial test of silty soil, the sample failed at normal stresses of 521 kPa and a shear stress of 200 kPa. Compute the maximum failure stress. a. 781 kPa b. 510 kPa c. 838 kPa d. 812 kPa
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- : In a tri-axial test of a silty soil, the sample failed at normal stress of 475 kPa and a shear stress of 350 kPa. Which of the following gives the angle of internal friction? Compute the angle that the failure plane makes with the x-axis. Compute the maximum failure stress.9. A consolidated drained test was carried out on a sandy clay under a cell pressure of 250 kPa. A constant back pressure of 120 kPa applied throughout the test. The dimensions of the sample were 76 mm x 38 mm. Addional test data recorded at failure were: Load transducer force = 368 N 3 Measured change in volume = 2.42 x 10 m³ Axial deformation = 2.05 mm Determine the major principal stress, o, at failure. (455 kPa)3 A sample of soil was subjected to a series of triaxial tests. The results were as shown in the table. If a third test is made with a cell pressure of 250 kPa. Determine the value of the maximum principal stress (in kPa) for the third test. 03 (kPa) 60 01 (kPa) 165 130 280 The value must be a number
- A direct shear test was carricd out on a cohesive soil sample and the following results were obtained. Normal stress (kN/m*) Shear stress at failure (kN/m) What would be the deviator stress at failure if a Triaxial test is carried out on the same soil with cell pressure of 150 (kN/m). 150 250 110 120A direct shear test was conducted on a dried sand sample in a test box of 60mm x 60mm normal load of 400N. The soil sample failed at an applied shear force of 250N. a. Determine the shear strength parameters of the soil. b. Estimate the required shear force to cause a shear failure under a normal load of 600N. (Show all working calculations.)Two undrained triaxial tests were conducted on soil specimen, and they gave the following results: Sample Confining Pressure Deviator Stress A 350 kN/m² B 500 kN/m² 150 kN/m² 300 kN/m² The shear strength of sample A in the plane of it's normal stress is A 588 kPa B 283 kPa C 730 kPa D 165 kPa Correct Option
- An undisturbed soil sample, 100 mm in diameter and 200 mm high was tested in a tri-axial 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 deg. to the horizontal and the cell pressure was 300 kPa. a.) Determine the angle of internal friction. b.) Determine the deviator stress in kPa. c.)Determine the cohesion of the soil in kPa.Import your data for FREE Buy now c. An undisturbed soil sample, 110 mm in diameter and 220 mm in height, was tested in a triaxial machine. The sample sheared under an additional axial load of 3.35 kN with a vertical deformation of 21 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m². 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. ii. A further undisturbed sample of the soil was tested in a shear box under the same drainage conditions as used for the previous test. If the area of the box was 3600 mm² and the normal load was 500 N, what would you expect the failure stress to have been? Q Search IN 9 quickbooks N quickbooks in reports 9:52 an 29/04/202ZAIN IQ I. Homework 4... During an oedometer test on a specimen of saturated clay, the thickness of the specimen decreased from 19.931 mm to 19.720 mm under an increment of stress from 200 to 400 kPa which was maintained for 24 hours. The stress was then removed from the specimen, its thickness was measured water content determined as 26.8%. 19.842 mm, and its Taking Gs of the particles to be 2.70, calculate the void ratio before and after the application of the stress increment, and the coefficient of volume decrease (m,) for this stress range. (Ans: e,= 0.731, e2= 0.713, m, = 0.052 m/MN)
- A series of three direct shear tests have been conducted on a certain saturated soil. Each test was performed on a 2.375-inch diameter, 1.0 inch tall sample. The test had been performed slowly enough to produce drained conditions. The results of the tests are as follows: Determine the friction angle and cohesion intercept. Test No. Normal Stress (psf) Shear Stress (psf) 2435 1656 2 4870 3571 3 7305 4578The following results were obtained in a series of consolidated undrained test on saturated clay: Sample No. All round pressure (03 ) (kN/m²) Deviator stress Pore water pressure (kN/m³) (kN/m²) 1 17 140 12 44 160 20 3 56 169 22 Determine the strength parameters c, c', o and '.The table shows the results of a consolidated undrained (CU) test on a overconsolidated clay soil sample. Sample No Cell Pressure (kPa) Deviator stress at failure (kPa) Pore water pressure at failure (kPa) 1 15 20 10 2 30 25 15 For the given data, plot the effective stress Mohr's circles at failure. Estimate the effective shear strength parameters C' amd phi'.