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- A landslide or Landslip isa geological phenomenon whichincludes a wide range of groundmovement
HELP!!!!
Landslides occur when thestability of a slope changes from a stable to an unstable condition. A  change in the stability o...
   groundwater pressure acting to destabilize the    slope.   Loss or absence of vertical vegetative    structure, soil ...
“Landslides areaggravated byhuman activities”
   deforestation, cultivation and construction, which    destabilize the already fragile slopes.   vibrations from machi...
- Sand boils or SandVolcanoes occur when water underpressure wells up through a bed ofsand. The water looks like it is"boi...
Sand boils can be a mechanism contributing to levee failure during floods. This effect is  caused by a difference in press...
A sand boil is difficult to stop. Themost effective method is by creating abody of water above the boil to create enough p...
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Land slides

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Land slides

  1. 1. - A landslide or Landslip isa geological phenomenon whichincludes a wide range of groundmovement
  2. 2. HELP!!!!
  3. 3. Landslides occur when thestability of a slope changes from a stable to an unstable condition. A change in the stability of a slope can be caused by a number of factors, acting together or alone. Natural causes of landslides include:
  4. 4.  groundwater pressure acting to destabilize the slope. Loss or absence of vertical vegetative structure, soil nutrients, and soil structure (e.g. after a wildfire). erosion of the toe of a slope by rivers or ocean waves. weakening of a slope through saturation by snowmelt, glaciers melting, or heavy rains. earthquakes adding loads to barely stable slope. Earthquake- caused liquefaction destabilizing slopes. volcanic eruptions.
  5. 5. “Landslides areaggravated byhuman activities”
  6. 6.  deforestation, cultivation and construction, which destabilize the already fragile slopes. vibrations from machinery or traffic. Blasting. earthwork which alters the shape of a slope, or which imposes new loads on an existing slope in shallow soils, the removal of deep- rooted vegetation that binds colluvium to bedrock. Construction, agricultural or forestry activities (logging) which change the amount of water which infiltrates the soil.
  7. 7. - Sand boils or SandVolcanoes occur when water underpressure wells up through a bed ofsand. The water looks like it is"boiling" up from the bed of sand
  8. 8. Sand boils can be a mechanism contributing to levee failure during floods. This effect is caused by a difference in pressure on two sides of a levee or dike, most likely during a flood. This process can result in piping, whereby the removal of soil particles results in a pipe through the embankment. The creation of the pipe will quickly pick up pace and will eventually result in failure of the embankment.
  9. 9. A sand boil is difficult to stop. Themost effective method is by creating abody of water above the boil to create enough pressure to slow the flow ofwater. A slower flow will not be able tomove soil particles. The body of water is often createdwith sandbags forming a ring around the boil

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