Direct Shear Test: Effect of Shearing Rate on Clayey Soil Strength
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Questions and Answers

Granular soils, such as sand, typically exhibit which of the following properties?

  • High cohesion and low internal friction
  • Low cohesion and high internal friction (correct)
  • Low cohesion and low internal friction
  • High cohesion and high internal friction
  • Which parameter describes the resistance of soil to shear deformation due to friction between soil particles?

  • Density
  • Cohesion
  • Angle of internal friction (correct)
  • Porosity
  • Which criterion is commonly used to describe the relationship between shear stress and normal stress on a plane within a soil mass?

  • Mohr-Coulomb failure criterion (correct)
  • Archimedes' principle
  • Bernoulli's principle
  • Hooke's Law
  • Failure in soil occurs when the shear stress on a plane reaches a critical value determined by which of the following?

    <p>Cohesion and angle of internal friction</p> Signup and view all the answers

    Which type of soil is primarily composed of organic matter and lacks significant cohesion?

    <p>Peat</p> Signup and view all the answers

    What effect does an increase in moisture content typically have on the shear strength of cohesive soils?

    <p>It decreases the shear strength</p> Signup and view all the answers

    What type of stresses does a triaxial shear test involve?

    <p>Combined normal and shear stresses</p> Signup and view all the answers

    What is indicated by the Mohr-Coulomb failure envelope passing through the origin for a soil sample with no cohesion?

    <p>The soil's shear strength is dependent on the angle of internal friction only</p> Signup and view all the answers

    What does the intersection point of the Mohr-Coulomb failure envelope with the shear stress axis represent?

    <p>The maximum possible shear stress the material can withstand</p> Signup and view all the answers

    What are the primary shear strength parameters of soil?

    <p>Cohesion and angle of internal friction</p> Signup and view all the answers

    What type of soils are often tested using the triaxial shear test?

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

    What is the main purpose of a consolidation test?

    <p>To determine the settlement of a soil</p> Signup and view all the answers

    What is the effect of faster shearing rates on the measured shear strength of clayey soils?

    <p>Increased shear strength due to rapid pore pressure build-up</p> Signup and view all the answers

    What is the primary reason for applying a confining pressure in a triaxial shear test on a sandy soil sample?

    <p>To simulate the in-situ lateral stress conditions the soil experiences</p> Signup and view all the answers

    What is a limitation of the direct shear test in determining failure planes?

    <p>The failure plane is artificially created and may not represent the plane of weakness in situ</p> Signup and view all the answers

    What is the effect of slower shearing rates on the shear strength of clayey soils?

    <p>Increased shear strength due to soil consolidation</p> Signup and view all the answers

    Why is the triaxial shear test preferred over the direct shear test for some soil types?

    <p>The triaxial shear test can simulate in-situ lateral stress conditions</p> Signup and view all the answers

    What is the effect of confining pressure on the shear strength of a sandy soil sample?

    <p>Increases the shear strength by simulating in-situ lateral stress conditions</p> Signup and view all the answers

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