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Questions and Answers
What is the formula for vertical stress due to geostatic stress?
What type of stress increases linearly with depth?
What is the term for the normal stress acting on the soil grains in saturated soils?
Which component of total stress within a soil mass is denoted by 'u'?
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In what type of soil is the total stress equal to effective stress due to the absence of pore water pressure?
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What carries the shear stress in a soil element according to the provided text?
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Study Notes
Geostatic Stress
- Vertical stress due to geostatic conditions can be calculated using the formula: σ = ρgh, where σ is the vertical stress, ρ is the density of the soil, g is the acceleration due to gravity, and h is the depth.
Depth-Dependent Stress
- Vertical stress increases linearly with depth due to the weight of overlying material in the soil mass.
Stress in Saturated Soils
- The normal stress acting on the soil grains in saturated soils is known as effective stress, represented by the formula: σ' = σ - u, where σ is total stress and u is pore water pressure.
Total Stress Components
- The component of total stress within a soil mass that is represented by 'u' is the pore water pressure, which affects the effective stress and stability of the soil.
Soil and Effective Stress
- In dry soils, the total stress is equal to the effective stress due to the absence of pore water pressure, meaning that all stress is taken up by the soil skeleton.
Shear Stress in Soil
- Shear stress in a soil element is carried by the soil grains themselves, which provide resistance to shearing forces when subjected to external loads.
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Description
Explore the different types of stresses within the soil, such as geostatic stress and stresses due to surface loading. Understand how these stresses are calculated and their impact on soil behavior.
