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173_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

173_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - of...

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SL2 Types of Failures Base Circular Toe Slope or Face (rare) Wedge _/J/ ~ Common Analysis Assumptions o plane strain - 20 failure (approximately true for large masses) o failure mass moves as a rigid body o isotropic soil: shear strength parameters same in all directions o factor of safety calculated by comparing average developed shear stress with shear strength along failure plane (stress at any point may be higherllower than average) o failures on long ("'infinite) slopes tend to be face failures with a failure surface essentially parallel to the ground surface ~ 0 failures on steep slopes tend to be single plane wedge failures o failures of finite slopes in cohesive soils have been observed to be nearly a circular o failures along planes of weakness (esp. layer
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Unformatted text preview: of weakness (esp. layer interfaces) may be analyzed using a series of straight lines (wedges) o the actual failure surface will be a combination of the above and three dimensional o analyses are necessarily iterative to find the weakest failure surface o determination of soil properties has a bigger impact on safety than defining the actual failure surface o both short and long term stability should be considered • short term depends on undrained soil parameters and total stresses • long term depends on drained soil parameters and effective stresses...
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