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

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

Linear relationship between force and material extension

In Hooke's Law, what is the strain of the material proportional to?

Applied stress

When elastic materials are stretched and stress is applied, what happens to the atoms and molecules?

They deform until stress is applied, then return to initial state

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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