EOSC 114 Lecture Notes - Lecture 15: Shear Strength, Failure Cause
17 Jul 2016
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Document Summary
Not as fast as a translational slide. At the angle of repose shear stress is exactly balanced. Manifests as shear stress (shearing is a motion from side to side, but across a plane. Friction: resistance to sliding (proportional to normal force/stress) We can model the stability of any slope by comparing resisting forces to driving forces. Factor of safety: ratio of shear strength to shear stress. The lower the factor of safety, the more likely it is to fall. Causes are factors (often long term) leading to instability of a given slope. They reduce the shear strength or increase shear stress of a slope. Triggers are factors (usually short events) that translate instability into motion. Many causes, but will only ever have one trigger. Causes: makes slope susceptible to movement without actually initiating failure. Factors outside the slope that affect stability a. slope angle. You must have a slope to have a mass movement.
