EOSC 114 Study Guide - Final Guide: Rockfall, Quick Clay
31 Jan 2013
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Slides: a) rotational soil/rocks slides down curved surface b)translational strong blocks of rock move down faulted plane (flat angle) Topples: falling of solid, coherent blocks that rotate around a point in the air. Spreads: (lateral) spread of soil, rock, usually b/c of liquefaction. Precipitation: decreases stability, filling between particles and allowing flow; can be variable depending on season, ie. heavy rainfall triggers landslides. Anthropogenic activity: excavating at the toe or top-loading; deforestation; mining; blasts; water leak from utilities. Lower strength:water gets in between grains, less friction; water freeze/thaw cycle expands, Did not take time to thoroughly test area before building. Filling of dam with water increased pore pressure buildup at toe of slope. Rock bedding planes (planes of weakness) dipped toward vally. Sensitive clays house of cards structure collapses due to liquid infiltration, liquefy. Frequent temperature fluctuation around freezing point of water. Deforestation, excavation & slope loading, climate change, changing water drainage.
