ENSC 2001 Lecture Notes - Lecture 5: Srf 1, Subsidence, Mass Wasting
16 Oct 2017
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Downslope movement of rock or soil slope failure, mass wasting, debris avalanches. Movement may be slow (soil creep), or very fast (rock falls or avalanches) 4 distinct elements on a slope that will control the slope process. 1st- convex slope: slow movement of soil or material (creep movement) 2nd under the extreme, free face (cliff): straight down face. 3rd straight slope: fast movement of material. 4th concave slope: other extreme side, water washed material, rock collection (talus slope) Complex: combination of two or more types of movement. Sf = 1 at an equilibrium point, but fail or become unstable due to progressive ware, If sf > 1, then safe or stable slope. If sf < 1, then unsafe or unstable slope overtime. Driving and resisting forces determined by the interrelationships of the following variables: Existing slip surfaces (inclined with the slope or not) Type of earth materials (consolidated or unconsolidated) (loosely packed unconsolidated materials give out easily)
