Use of instability curves for the assessment of post-liquefaction stability and deformation of sloping grounds

Research output: Contribution to journalArticlepeer-review


The paper presents a simplified approach to determine the post-cyclic de-2
formation of liquefied sloping grounds. The approach uses instability curves3
derived from undrained multi-stage (cyclic+monotonic) triaxial tests. It is4
shown that the salient aspects of the post-liquefaction deformation can be5
expressed as a function of the state parameter ψ, defined as the void ratio6
difference between the current state of the soil and its critical state at the7
same mean stress level, and amplitude of accumulated cyclic strain. As the8
proposed approach predicts deformations, rather than residual strength or9
factor of safety, the method can be used for the definition of the performance10
criteria following a performance-based design approach. The application of11
the proposed method is illustrated through a real case study.

Bibliographical metadata

Original languageEnglish
JournalEngineering Geology
Early online date9 Nov 2019
Publication statusE-pub ahead of print - 9 Nov 2019

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