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Engineering · Civil Engineering
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Answer the following true/ false questions: 1. A dense sand specimen will exhibit peak and critical states friction angles 2. Two saturated identical clay specimens (same clay and same density) were tested according to UU triaxial test. Specimen A was tested at 10 psi confining pressure whereas specimen B was tested at 20 psi confining pressure. Both specimens will exhibit the same undrained shear strength 3. Two saturated identical clay specimens (same clay and same density) were tested according to CU triaxial test. Specimen A was initially consolidated at 10 psi confining pressure whereas specimen B was consolidated at 20 psi confining pressure. Then both specimens were sheared under undrained condition at the same confining pressure of 20 psi. Specimen B will have higher undrained shear strength than specimen A 4. A loose sand specimen will exhibit only a critical states friction angle . A clay with undrained shear strength of 2200 psf is classified as a stiff clay Problem A certain saturated sand (S-100%) has a moisture content of 25.1% and a specific gravity of solids of 2.68. It also has a maximum index void ratio of 0.84 and a minimum index ratio of 0.33, Compute its relative density and classify its consistency (i.e, very loose, dense, very dense, etc.). Problem A sample of soil has a volume of 0.45 ft and a weight of 53.3 lb. After being dried in an oven, it has a weight of 45.1 lb. It has a specific gravity of solids of 2.70. Compute its moisture content and degree of saturation before it was placed in the oven.
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