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Questions and Answers
What is the decrease in void ratio of a 10-m thick layer of soft clay under a compressive load?
What is the primary factor affecting the consolidation of a clay layer?
What is the unit weight of a soil with a dry unit weight of 15.5 kN/m³ and a moisture content of 20%?
What is the reduction in thickness of a 10-m thick layer of soft clay when the void ratio decreases by one-half?
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What is the plastic settlement of a layer of plastic clay with an initial intergranular pressure of 200 kPa, an increase in intergranular pressure of 120 kPa, and a coefficient of consolidation of 0.315?
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What is the void ratio of a soil specimen with a moisture content of 50%, a degree of saturation of 90%, and a specific gravity of soil solids of 2.67?
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What is the reduction in thickness of the clay layer, in meters, when the void ratio decreases by one-half?
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A layer of plastic clay is subjected to an increase in intergranular pressure of 120 kPa. What is the resulting plastic settlement?
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What is the void ratio of a soil specimen with a moisture content of 50%, a degree of saturation of 90%, and a specific gravity of soil solids of 2.67?
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A certain soil has a dry unit weight of 15.5 kN/m³. What is the unit weight of the soil when water is added to a moisture content of 20%?
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What is the effect on the thickness of a clay layer when it is subjected to a compressive load?
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Study Notes
Soil Mechanics: Refresher Set 02
Compression of Soft Clay
- A 10-m thick layer of soft clay with an initial void ratio of 1.2 undergoes compression, resulting in a decrease in void ratio by one-half.
- This compression reduces the layer thickness by 2.73 meters.
Consolidation of Plastic Clay
- A layer of plastic clay is subjected to an initial intergranular pressure of 200 kPa, which increases by 120 kPa.
- The clay layer is 8 m thick, with a coefficient of consolidation of 0.315 and a void ratio of 1.125.
- The plastic settlement of the clay layer is 0.563.
Soil Properties
- A soil specimen has a moisture content of 50%, a degree of saturation of 90%, and a specific gravity of soil solids of 2.67.
- The void ratio of the soil specimen is 1.12.
Unit Weight of Soil
- A soil has a dry unit weight of 15.5 kN/m³.
- When water is added to a moisture content of 20%, the unit weight of the soil increases to 18.6 kN/m³.
Soil Mechanics
- A 10-m thick layer of soft clay with an initial void ratio of 1.2 reduces by half under a compressive load, resulting in a reduction of 2.37 m in thickness.
- The volume of the layer decreases by half, which means the layer thickness also decreases by half.
Consolidation of Clay
- A layer of plastic clay is subjected to an initial intergranular pressure of 200 kPa and an increase of 120 kPa, resulting in a plastic settlement of 0.365 m.
- The coefficient of consolidation is 0.315, and the initial void ratio is 1.125.
- The thickness of the clay layer is 8 m.
Void Ratio Calculation
- A soil specimen with a moisture content of 50%, a degree of saturation of 90%, and a specific gravity of soil solids of 2.67 has a void ratio of 1.12.
- The formula to calculate the void ratio is based on the given moisture content, degree of saturation, and specific gravity of soil solids.
Unit Weight Calculation
- A soil with a dry unit weight of 15.5 kN/m³ has a unit weight of 18.6 kN/m³ when water is added to a moisture content of 20%.
- The formula to calculate the unit weight is based on the given dry unit weight and moisture content.
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Description
Practice questions for the Civil Engineer Board Examination, focusing on soil mechanics and compression of clay layers. Review principles, techniques, and shortcuts for the exam.
