Mass Movement
- Created by: frankiemills
- Created on: 01-04-16 14:39
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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
- The internal resistance of a body to movement
- 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
- The force that attempts to pull the mass down
- Decrease in Shear Strength
- 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
- Creep
- 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
- Sea Walls
- 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
- Rocks are placed into the rock face to improve their strength
- Shotcrete
- Drainage
- Make underground water flow on the surface to reduce erosion from the inside
- Regrading
- 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
- Cost of Prevention
- Causes
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