3. For normally consolidated clay specimens, drained direct shear tests were conducted and the following data were obtained. Determine the drained angle of internal friction ợ of the clay. Applied Normal Stress, kPa Measured Peak Shear Stress, kPa 150 22.4 300 44.6 400 59.8 500 71.6

3. For normally consolidated clay specimens, drained direct shear tests were conducted and the following data were obtained. Determine the drained angle of internal friction ợ of the clay. Applied Normal Stress, kPa Measured Peak Shear Stress, kPa 150 22.4 300 44.6 400 59.8 500 71.6

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter6: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 6.12P: Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below...

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SITUATION 14: After conducting a tri-axial test on a sand sample, the normal and shearing stresses on the failure plane at failure were found to be 400 kPa and 350 kPa respectively.48. Which of the following gives the angle of shearing resistance? a. 38.79 b. 41.19 c. 48.81 d. 53.949. Which of the following most nearly gives the angle of failure plane measured from the major principal plane?a. 69.41 b. 64.40 c. 71.99 d. 65.5950. Which of the following most nearly gives the major principal stress? a. 1331.51 Kpa b. 1414.58 Kpa c. 1130.37 Kpa d. 1171.32 Kp
A sample of dry sand in relatively loose condi-tion is subject to a triaxial test. The sample failswhen the confining stress (minor principalstress) is 50 kPa and the axial stress (major prin-cipal stress) is 170 kPa. What is the angle ofinternal friction for the soil?
[Shear Strength,. speciments of a fully saturdated clay, the following results were obtained at failure. In a series of unconsolidated-undrained triaxial tests on Major Principal Stress Minor Principal Stress (kPa) 200 422 618 400 600 820 Calculate the following: a. Cohesion b. Angle of internal friction
Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below the center of the loaded area between depths of 3 m and 6 m. 6.1 A flexible circular area is subjected to a uniformly distributed load of 150kN/m2 (Figure 6.2). The diameter of the load area is 2 m. Determine the stress increase in a soil mass at points located 3 m below the loaded area at r = 0. 0.4 m, 0.8 m, and 1 m. Use Boussinesq’s solution. Figure 6.2 Increase in pressure under a uniformly loaded flexible circular area
Redo Problem 6.12 using Figure 6.15. 6.12 Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (av) below the center of the loaded area between depths of 3 m and 6 m. 6.1 A flexible circular area is subjected to a uniformly distributed load of 150 kN/m2 (Figure 6.2). The diameter of the load area is 2 m. Determine the stress increase in a soil mass at points located 3 m below the loaded area at r = 0, 0.4 m, 0.8 m, and 1 m. Use Boussinesqs solution. Figure 6.2 Increase in pressure under a uniformly loaded flexible circular area
In a series of unconsolidated-undrained triaxial tests on speciments of a fully saturdated clay, the following results were obtained at failure. Calculate the following:a. Cohesionb. Angle of internal friction
A consolidated drained tri-axial test was conducted on normally consolidated clay. The results were: the confining pressure is 300 kPa and the deviators stress is 300 kPa. Compute the shear stress in kPa on failure plane. a. 550 b. 119.03 c. 208.9 d. 141.42
2. A series of consolidated, undrained triaxial tests were carried out on specimens of a saturated clay under no backpressure. The test data at failure are summarized: Confining Pressure (kPa) Deviator Stress (kPa) Pore Water Pressure (kPa) 150 192 80 300 341 154 450 504 222 a. Draw the Mohr circles and find the cohesion and friction angles in terms of effective stresses. b. Compute Skempton’s A-parameter at failure for all three specimens. c. Is the soil normally consolidated or overconsolidated? Why? d. Another specimen of the same clay that was consolidated under a cell pressure of 250 kPa was subjected to a consolidated, drained triaxial test. What would be the deviator stress at failure?
A consolidated-undrained triaxial test on a specimen of saturated clay was carried out under an all-round pressure of 600 kPa. Consolidation took place against a back pressure of 200 kPa. The following results were recorded during the test. Draw the effective and total stress paths on p'-p an p - q space, respectively. 158 279 319 01- 03 (kPa) u (kPa) 200 277 388 433
Laboratory tests to determine shear strength parameters generally consists of direct shear and triaxial tests. Table 1 present data obtained from consolidated-undrained tests on a soft clay. Table 1: Triaxial test results At failure Pore water pressure (kN/m²) Cell pressure (kN/m²) Cu 200 400 800 Deviator stress (kN/m²) 117 242 468 110 227 455 Determine the shear strength parameters in terms of effective stress 3 90 ap uu im Cu to 207 415
Q-3: A consolidated-drained tri-axial test was conducted on a normally consolidated clay. The results are as follows: 03 = 276 kN/m² (Aod)f=276 kN/m² Determine a. Angle of friction, o' b. Angle that the failure plane makes with the major principal plane c. Find the normal stress o' and the shear stress ty on the failure plane d. Determine the effective normal stress on the plane of maximum shear stress Shear stress Š σí σí σ3 Effective stress failure envelope B σ3 = 276 kN/m² A Normal stress 20 σ = 552 kN/m² Ⓒ Cengage Learning 2014
24.A series of consolidated, undrained triaxial tests were carried out on specimens of asaturated clay under no backpressure. The test data at failure are summarized:Confiningpressure (kPa) Deviator stress(kPa) Pore waterpressure (kPa) 150 192 80300 341 154450 504 222 a. Draw the Mohr circles and find the cohesion and friction angles in terms of effectivestresses.b. Compute Skempton’s A- parameter at failure for all three specimens.c. Is the soil normally consolidated or over consolidated? Why?d. Another specimen of the same day that was consolidated under a cell pressure of 250 kPa wassubjected to a consolidated, drained tri axial test. What would be the deviator stress at failure?