chapter6 - Slope Processes, Landslides and Subsidence...

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Slope Processes, Landslides and Subsidence
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Movement of Portuguese Bend slide was continuous from 1956 to 1978 At the rate of 1cm/day and then increased to 2.5 cm/day Total displacement 200m
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Some houses moved as much as 25m, some 50m
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Introduction • Loss of 25 lives and destruction of $1 billion of property per year • Land slide is a natural process • Human intervention has increased frequency of landslides • Mass wasting is the downslope movement of earth materials • Subsidence is ground failure characterized by vertical deformation • Landslide refers to rapid downslope movement of rock and soil as a more or less coherent mass • Other terms used are slope failure and mass wasting
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Slope Processes • Free face vertical slope segment – hard granite • Talus slope rock fragments that fall from free face and accumulate on the slope • Gentler slope, accumulation of soil; rocks are not strong as in free face; more humid • Convex slope • Straight slope • Concave slope
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Types of landslides • Sliding downslope movement of coherent rock • Slumping sliding along curved plane • Falling free falling from face of cliff • Flowage or flowdownslope movement of unconsolidated material • Subsidence sinking of mass below surrounding material • Rates: cms/year to 1.5m/day to 30m/sec
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Slope stability • Forces on slopes • Role of earth material • Role of slope and topography • Role of climate • Role of vegetation • Role of water • Role of time
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chapter6 - Slope Processes, Landslides and Subsidence...

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