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Questions and Answers
What does shear strength of soil refer to?
Which of the following is NOT a problem related to shear strength?
How is shear failure of soil defined?
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?
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Which type of soil possesses bonding among particles?
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In what ways can shear strength be conventionally studied?
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What factor is emphasized as very important for shear strength?
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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?
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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?
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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 (Ï„): 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.
