EOSC 114 Lecture 15: LANDSLIDES 2
20 Apr 2018
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Document Summary
Angle of repose (mediocre definition better one later) Steepest angle a slope can maintain w/o collapsing. The exact angle varies depending on material. Shearing is motion from side to side, but across a plane. Component of the force of gravity parallel to the slope. Friction - resistance to sliding (proportional to normal force/stress) Cohesion - how the material holds together. Shear strength is the slope"s ability to resist shearing motion. We can model the stability of any slope by comparing resisting forces (shear strength - t(v)f) to driving forces (shear stress-t) If driving forces are greater than resisting - motion can occur. In other words, when shear strength is surpassed by shear stress. The ratio of shear strength (t(v)f resisting forces) to shear stress (t driving forces) At the angle of repose, shear stress is exactly balanced by shear strength. Fos is equal, or just above 1. 0. Causes are factors (often long term) leading to instability of a given slope.
