GEOL 21062 Lecture Notes - Lecture 13: Material Failure Theory, Milkshake, Surface Tension
31 Jan 2020
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Document Summary
Many geologic processes, including those shaping the land surface, are slow- acting, involving feedbacks that operate over many years. But surface processes can be rapid and episodic, too. In the previous lecture, we noted that the erosion of bedrock by river networks is the primary mechanism shaping many landscapes. We also noted that the river channels themselves occupy a small fraction of the landscapes, with the rest being hillslopes. We saw that gradual creep can move soil downslope. What happens to the landslide mass as it travels downslope: landslides, basic mechanism: frictional failure of soil or bedrock on a steep slope, sketch infinite-slope scenario for shallow landslides, coulomb failure criterion: Note that horizontal axis in plot should be eff: define factor of safety, fs. Resisting/driving " fs = (c + ( - p) tan ) / . 2# c = cohesion due to surface tension, tree roots, clays.
