Analytical Chem Soil HW Solutions 26

Analytical Chem Soil HW Solutions 26 - The failure...

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26 The failure envelopes sketched in Figure Q2.7c show that φ ' crit is constant (= 32.5 ° , closer to ' peak ψ max = 32 than the estimate of 35 based on ' peak – 0.8 × max ) because there is no dilation at the critical state ' peak reduces as the normal effective stress σ ' increases, because the amount of dilation needed to reach the appropriate (critical) specific volume is reduced. In design, it may be safer to use the critical state strength ' crit than the peak strength 'peak, because the peak strength depends on the extent to which the soil is dense in relation to the critical state under the effective stress conditions at failure. It is not a soil constant, and is unlikely to be the same throughout the mass of soil involved in a potential failure mechanism it is unlikely that the peak strength will be mobilised simultaneously throughout the soil mass; instead, progressive failure at an average strength rather lower than the peak may occur. However, the factors of safety used in may traditional methods of design may well allow for
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.

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