Manual on estimating soil properties for foundation design

TL;DR: In this article, the influence of aging on liquefaction potential is measured as the difference between the triggering of an aged sample versus a similar reconstituted sample, which can be used in performance-based analysis.

TL;DR: In this paper, the authors developed new probabilistic correlations for assigning design values of effective friction angle (φ′) of clean to silty sands from cone penetration test (CPT) data.

Abstract: Strength loss of natural clays subjected to seismic loading is a critical factor contributing to earthquake‐induced ground failure and associated hazards. This work proposes a bounding surface constitutive law to simulate cyclic strength degradation of natural clays resulting from the loss of structure and attendant accumulation of excess pore pressures. The proposed model employs an enhanced plastic flow rule that can simulate accurately the development of pore pressure and explicitly incorporates soil structure effects. The validation of the model with reference to the experimental evidence available for 3 structured clays shows that with a single set of parameters the proposed model can reasonably represent the mechanical behavior of natural clays under various loading conditions (1D compression, monotonic shearing in compression and extension, cyclic loading, and postcyclic shearing). Particularly, its satisfactory performance in terms of quantification of cyclic strength degradation encourages the use of the model in simulating boundary value problems related to the stability of geotechnical facilities under earthquakes.