lu 38 mass movement

    Subdecks (6)

    Cards (94)

    • what is mass movement?
      geomorphic process by which materials, including sand, soil, weathered and rock move downslope, under the influence of gravity
    • how are materials held?
      materials held on the slope by friction in a state of dynamic equilibrium
    • when is a slope stable?
      if the shear strength of the material is equal to or exceeds the shear stress acting on the slope
    • what is shear stress?

      force exerted by the weight of the material under the influence of gravity acting in the downslope direction
    • what is shear strength?
      • measure of the resistance of earth materials to be removed downhill
      • refers to internal cohesiveness of material on slope and how susceptible the material is to shearing
    • when does a slope become unstable?
      shear stress> shear strength causing due to fall in shear strength or increase in shear stress -> mass movement
    • how does mass movement vary?
      a result of slope instability, varies in scale, rate and type of movement
    • what are the types of mass movement?
      • heave (creep)
      • flow
      • slide
      • fall
    See similar decks