Slope_processes_2

Slope_processes_2 - Slope Stability Driving force Resisting...

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Slope Stability Driving force Resisting force Safety factor (SF) force Driving force Resisting SF = Driving and resisting forces determined by: Type of earth materials Slope (topography) Climate Water Vegetation Human activities Increase of slope: increases driving force decreases resisting force Gravity Driving force Resisting force 1 Gravity Steeper slope 2
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A hidden (latent) instability may exist on a slope yet mass movement may not occur Commonly there is a “triggering event” that causes the mass movement to occur Typical triggering events are heavy rainfalls, earthquakes, and construction Slope Instability and Triggering Events
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Role of water in unconsolidated materials Unsaturated water between grains bind particles together; increases cohesion and strength Saturated pressure exerted through the water pushes grains apart; decreases cohesion and strength
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Quicksand is an extreme (but rare) example of excess pore water pressure Excess water pressure causes sand grains to move apart causing loss of strength
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Slope_processes_2 - Slope Stability Driving force Resisting...

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