Mass Movement

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  • Mass Movement
    • Causes
      • Decrease in Shear Strength
        • The internal resistance of a body to movement
          • Deforestation
          • Rock type
          • Disintergration
          • Root Decay
          • Weathering
      • Increase in Shear Stress
        • The force that attempts to pull the mass down
          • Added weight
          • Freezing of water in cracks
          • Change in slope angle
          • Earthquakes
          • Removal or support
    • Types
      • Creep
        • Very slow. On low sloping planes. Involves solifluction and wetting and drying
      • Fall
        • Instantaneous occurs on very hard rock which is near vertical. Mainly due to freeze thaw
      • Rotational Slide
        • Rapid as entrie mass moves as one. Less coherent rock which is weakened by water when saturated
      • Non- Rotational Slide
        • Rapid. Occurs on coherent rock dipping towards the sea, rock falls as one mass due to gravity
      • Flow
        • Sporadic, occurs mostly in mud and soil, when saturated
    • Management Strategies
      • Regrading
        • Change the angle of the slope to reduce stress under gravity
      • Vegetating the slope
        • Roots help hold the rock together and improve shear strength
      • Land use zoning
        • Limit building on slopes to reduceweight
      • Reduce slope foot processes
        • Sea Walls
          • Limit processes such as undercutting
      • Control slope face processes
        • Shotcrete
          • Cement sprayed onto the rock face to improve strength
        • Soil nailing
          • Rocks are placed into the rock face to improve their strength
            • Rock Bolting
      • Drainage
        • Make underground water flow on the surface to reduce erosion from the inside
    • Impacts
      • Cost of Prevention
        • Research into causes
        • Cost of monitoring
        • Coastal protection schemes
      • Immidiate
        • Treating injuries
        • Costs of repairs and investigations
        • Transport delays
        • Evacuation and temporary shelters
      • Personal
        • Loss of possessions
        • Physiological traum
        • Fatal accidents
        • Injuries
      • Untitled
        • Compenstaion
        • Lowered land/property value
        • Increased insurance

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