Find the void ratio and the saturated unit weight of the soil. Find the total stress, effective stress, and pore water pressure at 5 m depth into the bottom of the lake.

Question

The soil profile shown consists of dry sand (7-m thick) which overlies a layer of clay (6-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water taable rises to the top of the ground surface, what is the change in effective stress (kpa) at the bottom of the clay layer? For sand layer: Void Ratio= 0.89 SG= 2.67 Degree of Saturation= 0.62 For claylayer: Void Ratio= 0.92 SG=2.72

Answer 1

Question

Chapter 8, Problem 8.11P

To determine

Find the void ratio and the saturated unit weight of the soil.

Find the total stress, effective stress, and pore water pressure at 5 m depth into the bottom of the lake.

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The soil profile shown consists of dry sand (7-m thick) which overlies a layer of clay (6-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water taable rises to the top of the ground surface, what is the change in effective stress (kpa) at the bottom of the clay layer? For sand layer: Void Ratio= 0.89 SG= 2.67 Degree of Saturation= 0.62 For claylayer: Void Ratio= 0.92 SG=2.72

Question 20 A soil profile consists of sand (5-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.82, Specific gravity = 2.68, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.92, Specific gravity = 2.86 Round off to two decimal places.

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