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Understanding Landslides and Slope Stability Dynamics

Explore the causes and processes of landslides, slope movements, and stability factors in this informative video. Learn about critical thresholds, forces on slopes, and different types of mass movements.

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Understanding Landslides and Slope Stability Dynamics

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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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