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Questions and Answers
What does shear strength of soil refer to?
What does shear strength of soil refer to?
Which of the following is NOT a problem related to shear strength?
Which of the following is NOT a problem related to shear strength?
How is shear failure of soil defined?
How is shear failure of soil defined?
What factor affects the shear strength of soils related to the water content?
What factor affects the shear strength of soils related to the water content?
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Which force leads to soil sliding upon each other due to exceeding shear strength?
Which force leads to soil sliding upon each other due to exceeding shear strength?
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Which type of soil possesses bonding among particles?
Which type of soil possesses bonding among particles?
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In what ways can shear strength be conventionally studied?
In what ways can shear strength be conventionally studied?
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What factor is emphasized as very important for shear strength?
What factor is emphasized as very important for shear strength?
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What is the force developed among particles in clayey soils?
What is the force developed among particles in clayey soils?
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Which theory is related to the shear strength components c & φ?
Which theory is related to the shear strength components c & φ?
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What consists of the components of shear resistance related to friction in soils?
What consists of the components of shear resistance related to friction in soils?
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What do principal stresses act on in a soil element according to the text?
What do principal stresses act on in a soil element according to the text?
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Study Notes
Shear Strength of Soils
- Shear strength is the resistance along a plane that passes between or along particle surfaces, but not through the particles.
- It's one of the most important characteristics of soils.
Types of Soils w.r.t. Shear Strength
- Cohesive soils: e.g., clayey soil, which possesses a bonding among particles.
- Cohesionless soils: e.g., sand, which has only friction factors among particles.
Components of Shear Resistance of Soils
- Friction resistance: developed due to friction that creates among particles under the applied stress, consisting of:
- Friction due to sliding of particles.
- Friction due to rolling of particles.
- Friction due to interlocking.
- Cohesion force: a force developed in clayey soils only among particles, which comes from bonding.
Mohr-Coulomb Theory
- The relation between shear strength and friction and cohesion as per Mohr-Coulomb law: S = τ = c + σn*tanυ.
- Where: S = shear strength of soil, c = cohesion of soil, υ = angle internal friction, σn = normal stress act on soil.
Stresses on Soil
- Normal stress (σ): a stress that acts perpendicular to a plane.
- Shear stress (τ): a stress that acts parallel to a plane.
- The state of stress at a point can be defined by nine components of stresses.
- There are three planes at right angles where only normal stresses acting, called principal planes.
Principal Stresses and Planes
- Principal stresses: σ1, σ2, σ3, acting on major, intermediate, and minor principal planes, respectively, where shear stresses = 0.
Factors Affecting Shear Strength of Soils
- Water content.
- Type and amount of loads (static or dynamic).
- Soil structures and disturbance effects.
Importance of Shear Strength in Soil Study
- Stability of slopes (e.g., hills slides, cuts, embankments, earth dams).
- Ultimate bearing capacity of a soil for foundation design.
- Lateral pressure against retaining walls, sheeting, or bracing.
- Friction developed by piles.
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Description
Test your knowledge on the ability of soil to support loading and shear strength properties. Learn about the resistance along a plane passing between particle surfaces.
