An SPT test was conducted in a dry sand (no ground water table) with a unit weight of 18kN/m3. The drill rig used had an energy efficiency rating of 60%. The recorded blow counts were 6, 7 and 8. The depth of testing was 6 m. Use the Liao and Whitman (1986) correction for overburden stress to determine the corrected SPT value at this depth. N60=? CN=? (use 3 decimals) N1(60)=? (truncated to an integer value)

An SPT test was conducted in a dry sand (no ground water table) with a unit weight of 18kN/m3. The drill rig used had an energy efficiency rating of 60%. The recorded blow counts were 6, 7 and 8. The depth of testing was 6 m. Use the Liao and Whitman (1986) correction for overburden stress to determine the corrected SPT value at this depth. N60=? CN=? (use 3 decimals) N1(60)=? (truncated to an integer value)

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.18P

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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 29/04/202
The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows Moisture content (%) 6 12 20 28 32 52.5 47.1 43.2 38.6 37.0 a) Determine the liquid limit b) If the natural water content is 38% and the plastic limit is 23%, calculate the liquidity index. c) Would you expect a brittle failure? WHY?
A CU triaxial test was carried out on a silty clay that was isotopically consolidated using a cell pressure of 125 kPa. The following data were obtained: Axial load (kPa) 0 5.5 11.0 24.5 28.5 35.0 50.5 85.0 105.0 120.8 Axial strain, &₁ (%) 0 0.05 0.12 0.29 0.38 0.56 1.08 2.43 4.02 9.15 Au (kPa) 0 4.0 8.6 19.1 29.3 34.8 41.0 49.7 55.8 59.0 (a) Plot the deviatoric stress vs. axial strain and excess porewater pressure vs. axial strain, respectively. (b) Determine the undrained shear strength (sµ). (Note: we assume that the sample reaches failure). (c) Determine the total principal stresses (0₁,03) and the effective principal stresses (0₁, 03') at the failure, respectively.
Question 2 The result presented in Table Q2a were obtained from a consolidated drained (CD) triaxial test on a normally consolidated clay sample of 75mm height x 38mm diameter tested at a confining pressure of 50 kPa. Table Q2a. CD triaxial test result Axial strain (%) 1 2 5 10 15 Applied force (kN) 0.01 0.03 0.05 0.08 0.10 Page 3 of 6 (a) Draw the Mohr circle for each stress state in the sample and the total stress path (TSP) throughout the test and determine the slope of the TSP to the horizontal.
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(a) A dry sand sample is tested in direct shear.The test procedure includes having a normal(compressive) stress of 200 kPa imposedwhile the sample undergoes shearing. Thesample fails when the shear stress reaches135 kPa. From this data, determine theangle of internal friction o for the soil.(b) A second sample of the same sand is also tobe tested in direct shear, but the applied nor-mal (compressive) stress will be 145 kPa.What shear stress is expected to cause thesample to fail?
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a. Explain the Mohr's circles shown in Figure Q2 for a series of undrained tests and consolidated undrained test carried out on the same clay. What are the strength parameters which can determined from each test? D. (a) (b) Figure Q2 b. Which is the third type of test not shown in the figure? What would you expect the Mohr's circles for this test to look like?
A consolidated drained tri-axial test was conducted on a normally consolidated day. The results were as foHows: 03 = 300 kPa (confining pressure) Deviators stress = 300 kPa o Compute the angle of shearing resistance. e Compute the angle that the failure plane makes with the major principal. stress. Compute the shear stress on the failure plane.
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