GEOL 111 Lecture Notes - Lecture 3: Subsidence, Lake Peigneur, Riprap
4 May 2017
School
Department
Course
Professor
Document Summary
Anatomy of a landslide: slip (rupture) surface: plane along which the detached material move, scarp: a wall-like feature produced where a block breaks away from the slip surface, leaving an exposed steep surface. Strength of the slope: internal structure of the slope material, loose sediments / rock layers, moisture content, effects strength of slope, vegetation, plants absorb excess water and roots stabilize the slope. Oversteepening and overloading: slope angle is increased when, fill is added above, slopes are undercut below, balance between forces acting on slope can be upset by, adding material or load at top, removing material from toe. Adding water: heavy or prolonged rainfall saturates soil, increases pore water pressure and causes slides, human actions add water to slopes, lawn-watering, crop irrigation, leaking water or sewer pipes, cracked swimming pools, filling reservoir behind dam. Mitigation of damages from landslides: not covered by most insurance policies, example: washington landslide (2014)
