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Landslides & Related Phenomena

Landslides & Related Phenomena. http://www.youtube.com/watch?v=mknStAMia0Q. Landslides & Related Phenomena. http://www.youtube.com/watch?v=mknStAMia0Q. http://www.youtube.com/watch?v=F31ywRvtNkY. Introduction to Landslides. Landslide – rapid downslope movement of “coherent” mass

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Landslides & Related Phenomena

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  1. Landslides & Related Phenomena http://www.youtube.com/watch?v=mknStAMia0Q

  2. Landslides & Related Phenomena http://www.youtube.com/watch?v=mknStAMia0Q http://www.youtube.com/watch?v=F31ywRvtNkY

  3. Introduction to Landslides • Landslide – rapid downslope movement of “coherent” mass • Slope failure/mass wasting- general term (e.g. mudflows, rockfalls, snow/debris avalanches) • Subsidence (downward movement)

  4. Introduction to Landslides

  5. Slope Processes and Slope Stability • “If it’s not a river or a beach, it’s a hillslope, of one ilk or another” • Most common landforms • Appear static; actually are dynamic • Valley • Moving downhill • Creep • Avalanche/rock fall • Moderate events are the most important • Magnitude • Frequency

  6. Slope Processes and Slope Stability • Processes • Slope elements • Convex slope/crest • Free-face • Angle of repose • Debris slope • Convex slope/wash slope

  7. Angle of Repose Angle of repose: particle size particle shape moisture content

  8. Slope Processes and Slope Stability • Processes • Slope movements or deformation • Flowage/flow • Sliding • Falling • Subsidence • Classification • Type of movement • Slope material • Amount of water present • Rate of movement

  9. Classification of Mass Movement Creep

  10. Types of Movement

  11. Slope Movements

  12. Slope Stability • When does a slope fail? • What is the critical threshold that’s exceeded? Variables: • Material type • Slope • Topography • Climate • Vegetation • Water** • Time.

  13. Landslides & Related Phenomena http://www.impactlab.com/2008/10/12/the-heyelan-land-slide/

  14. Potential slip plane (clay). C D A N W ROCK Slope Stability • Forces on Slopes • Driving forces--tend to move material down slope • Weight of material (includes water)* • Vegetation • Fill material • Building loads • D = W sin A = driving force • the downslope component of gravity.

  15. Potential slip plane (clay). C D A N W ROCK Slope Stability • Forces on Slopes • Resisting forces--forces that tend to resist movement • Shear strength • N = W cos A = the normal component of W • contributes to the shear strength along the slip plane • contributes to the resisting force.

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