EM 104: Rock Mechanics - Rock Strength and Failure Criteria Quiz
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Questions and Answers

What property did Robert Hooke notice when studying springs and elasticity?

  • Non-linear relationship between force and material extension
  • Linear relationship between force and material extension (correct)
  • No relationship between force and material extension
  • Constant force for any material extension
  • In Hooke's Law, what is the strain of the material proportional to?

  • Material density
  • Temperature
  • Material volume
  • Applied stress (correct)
  • When elastic materials are stretched and stress is applied, what happens to the atoms and molecules?

  • They break apart
  • They remain unchanged
  • They shrink in size
  • They deform until stress is applied, then return to initial state (correct)
  • What did Robert Hooke study that led to the formulation of Hooke's Law?

    <p>Springs and elasticity</p> Signup and view all the answers

    Within which limit of a material does Hooke's Law state the strain is proportional to applied stress?

    <p>Elastic limit</p> Signup and view all the answers

    In the study of stress-strain behavior, what region exhibits a linear relationship between force and material extension?

    <p>Elastic region</p> Signup and view all the answers

    Which type of stress results in shortening or flattening?

    <p>Compressive Stress</p> Signup and view all the answers

    Which type of strain occurs when a rock bends but doesn’t break?

    <p>Plastic strain</p> Signup and view all the answers

    What type of rocks are most likely to undergo brittle deformation?

    <p>Igneous and non-foliated metamorphic rocks</p> Signup and view all the answers

    Which type of stress results in stretching and elongation?

    <p>Tensile Stress</p> Signup and view all the answers

    Which type of stress results in a sort of smearing?

    <p>Shear Stress</p> Signup and view all the answers

    Which type of deformation results in permanent deformation without fracture?

    <p>Plastic deformation</p> Signup and view all the answers

    What is the term for force per unit area in the context of stress?

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

    What is the maximum amount of stress a material can withstand before deforming permanently called?

    <p>Elastic limit</p> Signup and view all the answers

    Which type of rocks are likely to undergo plastic deformation?

    <p>Sedimentary rocks with well-developed zones of weakness</p> Signup and view all the answers

    Under what conditions does elastic strain occur?

    <p>When the material recovers its initial shape</p> Signup and view all the answers

    What influences how a rock mass accommodates strain?

    <p>Temperature and pressure</p> Signup and view all the answers

    In stress-strain behavior, which response involves the fracturing of a rock in response to stress with little or no permanent deformation?

    <p>Brittle response</p> Signup and view all the answers

    What does stress refer to in rock mechanics?

    <p>The force applied to a plane divided by the area of the plane</p> Signup and view all the answers

    What is the primary reason for mapping peak stress values in rock engineering?

    <p>To assess the strength of the rock</p> Signup and view all the answers

    How do rocks destress themselves according to the text?

    <p>By chipping off fragmentation</p> Signup and view all the answers

    What is strain in rock mechanics?

    <p>The deformation of rocks</p> Signup and view all the answers

    In engineering, what does failure mean for rocks?

    <p>Loss of intended function performance</p> Signup and view all the answers

    What is one way rocks can destress themselves according to the text?

    <p>Heaving upward or outward</p> Signup and view all the answers

    What type of stress is due to the effect of gravity on the overburden?

    <p>Gravitational Stress</p> Signup and view all the answers

    Which factor controls the behavior of rocks under tectonic stress, causing them to undergo plastic/ductile deformation?

    <p>Temperature &amp; Pressure</p> Signup and view all the answers

    What type of deformation occurs in rocks under low temperature and pressure when subjected to tectonic stress?

    <p>Brittle Deformation</p> Signup and view all the answers

    Under what condition do rocks tend to undergo permanent plastic/ductile deformation?

    <p>High Temperature &amp; Pressure</p> Signup and view all the answers

    What type of stress is due to previous or present-day straining in the earth's crust?

    <p>Tectonic Stress</p> Signup and view all the answers

    Which factor is more likely to result in permanent deformation when tectonic stresses are applied over a long period of time?

    <p>High Tectonic Stress</p> Signup and view all the answers

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