Closure of "Undrained Shear Strength of Liquefied Sands for Stability Analysis"

The postliquefaction shear strength of sands, called the undrained critical strength or su(critical), is evaluated in terms of the critical strength ratio, su(critical)/ρ´vo This allows postliquefaction stability analyses to incorporate the variation of su(critical) with effective vertical stress instead of using a single value as proposed elsewhere. Comparison of back‐calculated critical strength ratios and the cyclic stress ratios triggering liquefaction suggests that drainage occurs in most cases during the postliquefaction flow of liquefied sands. To evaluate the stability of an existing slope that is predicted to liquefy during a dynamic event, the original slope configuration and the constant volume su(critical) must be used instead of the back‐calculated partially drained su(critical) values. The proposed procedure for estimating the constant volume su(critical), using the results of field and/or laboratory tests, shows that the critical strength ratio is approximately one‐half the yield strength r...

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