Publicado

2018-10-01

Constitutive simulation of a Kaolin clay with vertical and horizontal sedimentation axes

Simulación de una arcilla Caolín con ejes de sedimentación vertical y horizontal

DOI:

https://doi.org/10.15446/dyna.v85n207.69197

Palabras clave:

inherent anisotropy, clays, sample preparation method, hypoplastic model for clays (en)
anisotropía inherente, arcillas, método de preparación de muestras, modelo hipoplástico para arcillas (es)

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Experimental observations indicate that the mechanical behavior of clays is not only dependent on the stress and void ratio, but on its inherent anisotropy. The latter is the one arising from the material sedimentation process. In this work, the inherent anisotropy of a Kaolin clay is studied. For this purpose, soil samples are prepared with a proposed method producing samples with horizontal and vertical sedimentation axes. The samples go thru permeability tests, unconfined compression tests, oedometric compression tests and direct shear tests and the results carefully analyzed from the constitutive modeling point of view using the hypoplastic model for clays by [1]. Later, identify parameters depending on the inherent anisotropy; then perform some simulations to evaluate the model performance upon different samples with vertical and horizontal sedimentation angles. At the end, some concluding remarks are given.
Las observaciones experimentales indican que el comportamiento mecánico de las arcillas no solo depende de los esfuerzos y relaciones de vacíos, sino también de la anisotropía inherente. Esta última corresponde a la obtenida durante el proceso de sedimentación del material. En este trabajo, se estudia la anisotropía inherente de una arcilla Caolín. Para este propósito, se prepararon muestras de suelo con un método que permite producir muestras con ejes de sedimentación vertical y horizontal. Las muestras son posteriormente ensayadas en tests de permeabilidad, compresión inconfinada, oedométrico y corte directo. Los resultados son analizados cuidadosamente desde la perspectiva de la modelación constitutiva con el uso del modelo hipoplástico para arcillas de [1]. Los parámetros que dependen de la anisotropía inherente fueron identificados, y se evaluó el desempeño del modelo mediante simulaciones de distintas muestras con ejes de sedimentación horizontal y vertical. Finalmente, se presentan algunas conclusiones.

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Citas

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