Shear Strength of Soil Quiz

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Questions and Answers

What does shear strength of soil refer to?

  • Resistance perpendicular to particle surfaces
  • Resistance along a plane through the particles
  • Resistance in the vertical direction
  • Resistance along a plane between particle surfaces (correct)

Which of the following is NOT a problem related to shear strength?

  • Ultimate bearing capacity for foundation design
  • Stability of slopes
  • Development of friction in piles
  • Compressibility of soil (correct)

How is shear failure of soil defined?

  • Expansion of soil due to tension forces
  • Lateral movement of soil particles
  • Sliding of soil particles causing volume changes (correct)
  • Vertical compression of soil particles

What factor affects the shear strength of soils related to the water content?

<p>Optimum water content for maximum shear strength (C)</p> Signup and view all the answers

Which force leads to soil sliding upon each other due to exceeding shear strength?

<p>Compression forces (D)</p> Signup and view all the answers

Which type of soil possesses bonding among particles?

<p>Clayey soils (A)</p> Signup and view all the answers

In what ways can shear strength be conventionally studied?

<p>Through laboratory tests on site samples (A)</p> Signup and view all the answers

What factor is emphasized as very important for shear strength?

<p>Type of soil (D)</p> Signup and view all the answers

What is the force developed among particles in clayey soils?

<p>Cohesion force (D)</p> Signup and view all the answers

Which theory is related to the shear strength components c & φ?

<p>Mohr-Coulomb theory (A)</p> Signup and view all the answers

What consists of the components of shear resistance related to friction in soils?

<p>Rolling resistance, interlocking resistance, sliding resistance (C)</p> Signup and view all the answers

What do principal stresses act on in a soil element according to the text?

<p>'Normal planes' (B)</p> Signup and view all the answers

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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 = Ï„ = c + σn*tanÏ….
  • Where: S = shear strength of soil, c = cohesion of soil, Ï… = 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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