geology_22

geology_22 - Chapter 8: SLOPE PROCESSES, LANDSLIDES, and...

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Chapter 8: SLOPE PROCESSES, LANDSLIDES, and SUBSIDENCE Introduction: Landslide and other ground failures posting substantial damage and loss of life In U.S., average 25 deaths; damage more than $1 billion For convenience, definitions of landslide includes all forms of mass-wasting movements Landslide and subsidence: naturally occurred and affected by human activities Role of gravity and slope angle: Gravitational force acts to hold objects in place by pulling on them in a direction perpendicular to the surface The tangential component of gravity acts down a slope: it causes objects to move downhill Shear stress is the downslope component of the total stress involved Steepening a slope by erosion, jolting it by earthquake, or shaking it by blasting, can cause an increase in shear stress Normal stress is the perpendicular component The role of water: Water is almost always present within rock and regolith near the Earth’s surface Unconsolidated sediments behave in different ways depending on whether they
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This note was uploaded on 04/08/2011 for the course GEOL 2001 taught by Professor Babaie during the Winter '09 term at UGA.

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geology_22 - Chapter 8: SLOPE PROCESSES, LANDSLIDES, and...

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