Anisotropy of lacustrine soils in a large oedometer equipped with bender elements
Por:
Chamorro-Zurita, Claudia, Ovando-Shelley, Efrain
Publicada:
1 abr 2020
Resumen:
Lacustrine soils from the former Texcoco Lake within the Basin of
Mexico, some 14 km north of Mexico City, have unique geotechnical
properties. These materials have been thoroughly studied in the past,
and yet, very few investigations have addressed the issue of the
anisotropy of their shear stiffness modulus at very small strain levels
(G(0)). Stiffness anisotropy, even at very small deformations, may
significantly influence the response of the soil in a variety of cases
and applications including soil-structure interaction problems under
static and dynamic conditions. In this study, a large-size oedometer
equipped with bender elements was used to measure the shear wave
velocities along different paths as an indirect assessment of G(0). The
initial or inherent anisotropy of the materials was evaluated with these
measurements. The experimental results revealed that the stress-induced
anisotropy was not significant; hence, the shear stiffness modulus was
seen to depend mainly on the initial anisotropy. An inverse correlation
between the yield stress (sigma(y)') (or over-consolidation ratio, OCR)
and the initial anisotropy was found, whereas a direct correlation
between the liquidity index and the initial anisotropy was also
disclosed. (C) 2020 Production and hosting by Elsevier B.V. on behalf of
The Japanese Geotechnical Society.
Filiaciones:
Chamorro-Zurita, Claudia:
Univ Nacl Autonoma Mexico, Inst Ingn, Ciudad Univ, Mexico City 04510, DF, Mexico
Ovando-Shelley, Efrain:
Univ Nacl Autonoma Mexico, Inst Ingn, Ciudad Univ, Mexico City 04510, DF, Mexico
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