SOIL MECHANICS Exam #3: Shear Strength.
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1 SOIL MECHANICS Exam #3: Shear Strength. Questions (2 Points Each - 20 Points Total): 1. Write the equation for the Mohr-Coulomb Failure Criteria for effective stresses in soils and detail the variables. 2. You have been given the results of a direct shear test on a well-graded sand (SW) sample. The Mohr-Coulomb effective stress failure criteria given to you from the test results are an effective friction angle of 33 degrees and an effective cohesion of 8.5 psi. Do you think these results are reasonable? Provide an explanation of your answer. 3. List the soil shear strength tests covered in class Exam 3 Page 1 of 7
2 4. Write the equation for the Mohr-Coulomb Failure Criteria for total stresses in soils and detail the variables. 5. You are given three soil samples. Soil Sample 1 is a silty sand. Soil Sample 2 is a fat clay. Soil Sample 3 is a lean clay. You are told to conduct the following triaxial tests on the samples: a slow test on Sample 1, a rapid test on Sample 2, and a quick test on Sample 3. What triaxial tests are you conducting on each sample? Provide the common test names and 2 letter abbreviations. 6. The direct shear test has been shown to be an effective test for determining the shear strength parameters (i.e. Mohr-Coulomb Failure Criteria) for coarse grained soils, especially sands. What is the major shortcoming of this test? 7. You have completed an unconfined compression test on a CL soil sample. The unconfined compression strength is 1120 psf. What is the undrained shear strength of this soil? Exam 3 Page 2 of 7
3 8. Write the equation that relates unconfined compressive strength to undrained shear strength and detail the variables. 9. Briefly describe soil sensitivity. Write any relevant equation(s) and detail the variables. 10. Identify the relative density of the sands in the direct shear test results shown on Page 4. What is the major cause of the shear strength difference between the two samples if you are told that they are from the same soil deposit? Exam 3 Page 3 of 7
4 Volume Change Expansion Shear Stress Shear Displacement Compression Shear Displacement Exam 3 Page 4 of 7
5 Problems: (1 25 points, 2-25 points, 3 15 points, 4 15 points, EC 5 Points) NOTICE: You must detail your answers (i.e. show your work) for these four problems for full credit. You must follow assignment guidelines for these problems. 1. Soil from a local contractors sand pit is proposed for use as backfill behind a retaining wall for a local project. The project specifications require that the backfill material have a minimum peak soil friction angle of 33 at the required minimum compaction (i.e. 90% Standard Proctor). The results from the direct shear testing performed at the minimum required compaction by a local testing firm are presented in Table 1: Soil Description: Silty Sand (SM). Table 1. Direct Shear Results conducted at 90% MMD (ASTM D698). Test Confining Stress ( ) Shear Stress ( ) Peak Residual Based on the provided information, answer the following: What are the peak and residual Mohr-Coulomb Failure Criteria for this material? Does this material meet the provided project specifications? Do you think this soil was tested in a loose or dense state? Explain your answer Exam 3 Page 5 of 7
6 2. Soil from another local contractors sand pit is proposed for use as backfill behind a Mechanically Stabilized Earth (MSE) Wall for another local project. The project specifications require that the backfill material have a minimum residual soil friction angle of 34 at the required compaction (i.e. 95% Modified Proctor). Table 2 provides the results from the direct shear testing on this sample performed at the minimum required compaction by a local testing firm: Soil Description: Poorly Graded Sand (SP) Table 2. Direct Shear Results conducted at 95% MDD (ASTM D1557). Test Confining Stress ( ) Shear Stress ( ) Peak Residual Figure B on Sheet 5 provides a graph for you to plot this data. Based on the provided information, answer the following: What are the peak and residual Mohr-Coulomb Failure Criteria for this material? Does this material meet the provided project specifications? Do you think this soil was tested in a loose or dense state? Briefly explain your answer Exam 3 Page 6 of 7
7 3. The results from three (3) Consolidated Undrained triaxial tests conducted on samples from a normally consolidated CL soil deposit are presented in Table 3. Table 3. CU Results on normally consolidated CL sample. Test Minor Principal Stress at Failure ( ' 3f ) (psi) Major Principal Stress at Failure ( ' 1f ) (psi) Pore Failure ( u df ) (psi) Determine the Effective Stress Mohr-Coulomb Shear Strength Parameters (i.e. effective friction angle and effective cohesion) for this soil. 4. Using the CU test data provided in Problem 3, determine the Total Stress Mohr- Coulomb Shear Strength Parameters (i.e. friction angle and cohesion) for this soil. EXTRA CREDIT (5 points): You are building a new embankment over cohesive soils. You need to determine the shear strength parameters to conduct slope stability and bearing capacity analyses at the end of construction (i.e. when the embankment is completed). What triaxial test(s) would you select to determine the shear strength parameters for these analyses? What would the shear strength parameter(s) be? Exam 3 Page 7 of 7
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