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DAWSON COLLEGE CIVIL ENGINEERING TECHNOLOGY DEPARTMENT FALL 2019 221-665-DW SOILS II ASSIGNMENT #2: SHEAR STRENGTH OF SOILS ASSIGNMENT #2: SHEAR STRENGTH OF SOIL Due at the beginning of lab: Thursday September 12, 2018. 1. A Triaxial test was performed on a dry, cohesionless soil under a confining pressure of 144.0 kN/m 2 . If the sample failed when the deviator stress reached 395.8 kN/m 2 , determine the soil’s angle of internal friction using trigonometric relationships. 2. A sample of dry, cohesionless soil has an angle of internal friction of 35°. If the minor principal stress is 15 psi, at what values of deviator stress and major principal stress is the sample likely to fail? Use trigonometric relationships to determine your answer. 3. A Triaxial test was performed on a clayey soil under unconsolidated, undrained conditions. Find the cohesion of this soil using trigonometric relationships if major and minor stresses at failure were 144 and 48 kN/m 2 , respectively. 4. The data shown in the following table were obtained in triaxial compression tests of three identical soil specimens. Find the soil’s cohesion and angle of internal friction by graphical methods and find the angle of the failure plane, and the normal and shear stress of the failure plane of specimen #2 using trigonometric relationships. Specimen Number Minor Principal Stress  3 (lb/in 2 ) Major Principal Stress  1 (lb/in 2 ) 1 5 23.0 2 10 38.5 3 15 53.6 5. Assume that both a triaxial test and a direct shear test are to be performed on a sample of dry sand. When the triaxial test is performed, the specimen fails when the minor and major principal stresses are 20 and 80 psi, respectively. When the direct shear is performed, what shear strength can be expected if the normal stress is 4000psf? Draw the graph and then determine your answer using trigonometric relationships. Note: All of you answers should also include the appropriate diagrams drawn neatly to scale and at a scale appropriately large enough to be accurate .

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