G1-Lecture31-Slope-Stability

G1-Lecture31-Slope-Stability - CEG CEG-4011 Geotechnical...

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Unformatted text preview: CEG CEG-4011 Geotechnical Engineering I 4011 Geotechnical Engineering I Lecture #31 Lecture #31 The Stability of Slopes L. Prieto-Portar 2008 An unstable slope is shifting both the house and the garden wall towards the right. Breached earth dam in Los Angeles, California. A complex slide with some flow elements affecting a state highway. Note the steep face of the main scarp, which is a common characteristic of the failure surface. main scarp crown toe main body right flank The Santa Tecla suburb of San Salvador experienced this flow failure due to a 7.6 Magnitude earthquake on 13 January 2001. Over 2,000 people died, and 470 houses were totally destroyed. The earthquake lasted 32 seconds, and was followed by 600 aftershocks. This slope failure in Santa Monica is a common occurrence in California. Slope failures are triggered by heavy rains (lubricating the unseen failure surfaces), earthquakes (they increase the pore pressures and increase the loads on the slopes) and/or overloading of the crown. This fall was captured on film by a passing motorist along Californias Route 1, which follows the Pacific coast, close to Santa Monica. A potentially sliding slope is stabilized with anchors at a beach front in Southern California. Rock bolting an unstable face prone to falls . Flow failure at La Conchita, 10 January 2005. This flow has killed 3 people and injured 27 in this village in Ventura County, CA. The village laid at the mouth of a deep canyon, that funneled hundreds of thousands of cubic meters of earth (mud) into the village in a few minutes. The press mistakenly called this a mudslide. This flow was a byproduct of a string of storms that precipitated 17 inches of rain during two days. At least 19 lives were lost during these two days (9 and 10 January, 2005). Rescue workers dig through the mud and debris looking for survivors in the La Conchita, California on Monday, January 10, 2005. A huge mudslide crashed down on homes in a coastal hamlet with terrifying force Monday, killing at least one person and leaving up to 12 missing as a Pacific storm hammered Southern California for a fourth straight day. (AP Photo/Ventura County Star, Gary Phelps). This diagram reconstructs the outline of the flow failure at La Conchita, 10 January 2005 in Ventura County, CA. Flows are down-slope movements of earth that resemble a viscous fluid. They are usually triggered by rain (or snowmelt) and are commonly accompanied by flooding. It is estimated that slope failures cause $1.8 billion every year in the United States. A boulder, part of the mudslide into the village of La Conchita, CA on the 10 th of Jan. 2005. An 100-year old 75-foot tall retaining wall collapsed on 13 May 2005 alongside New Yorks Henry Hudson Parkway. (ENR 23 may 2005). A mobile home in the Sand Canyon mobile home park in Canyon Country, Calif., is overtaken by flood waters on Monday January 10, 2005....
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This note was uploaded on 09/11/2011 for the course CEG 4011 taught by Professor Staff during the Summer '10 term at FIU.

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G1-Lecture31-Slope-Stability - CEG CEG-4011 Geotechnical...

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