Resumo

RAMOS CANON, Alfonso Mariano. Influence of the void ratio and the confining on the static liquefaction in slopes in changi sand. Tecnura [online]. 2015, vol.19, n.43, pp.63-73. ISSN 0123-921X.  https://doi.org/10.14483/udistrital.jour.tecnura.2015.1.a04.

A numerical study on the onset of static liquefaction in slopes under undrained conditions of loading was developed based on a general liquefaction flow instability criterion for elastoplastic soils based on the concept of loss of controllability. The criterion is applied to the case of axisym-metric loading to detect the onset of static liquefaction. The criterion is used in conjunction with an elastoplastic model for sands and is tested by means of numerical simulations of element tests. The numerical results are compared with experimental evidence obtaining good agreement. A quantitative study of the influence of the mean pressure, void ratio and the anisotropy of stress on the onset of static liquefaction is presented for the Changi sand. From the analysis of the numerical results, it can be concluded that: a. the mobilized friction angle at the onset of liquefaction is not an intrinsic property of the material, but is a state variable b. Despite of the multiple variables involved in the process of generation of und-rained instability, the state of stresses at the onset of static liquefaction can be conveniently represented by a linear relation between Δq/p₀and η₀. This graphical representation can be used in the practice of geotechnical engineering to quantify the margin of security against the static liquefaction of a sandy slope.

Palavras-chave : instabilities in sands; static liquefaction; stress anisotropy.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )