Mass Movement
- Created by: Holl van Driel
- Created on: 08-01-15 14:45
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- Mass Movement
- 'downslope movement of regloith by gravity'
- Shear Strength
- - the internal resistance of a body to movement
- Factors contributing to reduce shear strength
- Weathering effects
- Disintegration of rocks;hydration of clay minerals;solution of minerals in rocks or soil
- Changes in soil and ground-water pressure
- Saturation, softening of material
- Changes of structure
- Creation of fissures in clays, removal of sands and clays
- Biological effects
- Burrowing of animals, growth and decay of roots
- Weathering effects
- Shear Stress
- - the force acting on a body that causes movement of the body down slope
- Factors contributing to increased shear stress
- Removal of suuport through undersutting or slope steepening
- -e.g. erosion by rivers, glaciers, wave action, faulting, previous rockfalls or slides
- Removal of underlying support
- Undercutting by rivers waves, subsurface solutuion
- Loading of slope
- Weight of water, vegitation, accumulation of sediments
- Lateral pressure
- water in cracks, freezing in cracks, swelling, pressure release
- Short term stresses
- Earthquakess, movement of trees in wind
- Removal of suuport through undersutting or slope steepening
- Types of mass movements
- very slow movement (soil creep)
- Fast movement (avalanches)
- Dry movement (rockfalls)
- Very fluid movements (mudflows)
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