Elastoplastic behaviour of an unsaturated residual soil from sandstone
DOI:
https://doi.org/10.14195/2184-8394_89_2Abstract
ln this paper some results of triaxial compression tests performed with control of stress and suction are presented. Tests were accomplished using undisturbed samples of an residual sandy soil, collected on a typical soil profile from São Carlos City. It is shown that soil yield surface shape can be predicted using some of the most known constitutive models proposed to foresee unsaturated soil behaviour. A non-associated flow law is proposed to the soil. Changes either on yield surface size or on suction values did not appear to modify the nature of the soil flow law or the shape of the yield locus. Its is also shown that the enlargement of the yield surfaces with suction can be fairly predicted using data from triaxial and confined compression tests performed with suction control.
Downloads
References
ALONSO E. E.; GENS, A. e JOSA, A. - A constitutive model for partly saturated soils. Géotechnique 40(3), 1990.
ALONSO, E. E.; GENS, A. e WIGHT, D. W. - Special problem soils. General Report (session 5). Proc. X, ICSMFE, Dublin, 1987.
BALMACEDA, A.; JOSA, A.; GENS, A e ALONSO, E. E. - An elasto-plastic model for partially saturated soils exhibiting a maximum collapse. Proc. 3rd Int. Conf. On Comp. Plasticity, 1, Barcelona, 1992.
FREDLUND, D. G. e MORGENSTERN, N. R. - Stress state variable for unsaturated soils. ASCE, 103, GT5, 1977
FREDLUND, D. G. e XING, A. - Equations for the soil water characteristic curve. Can. Geotechnical Joumal, 31(4). 1994.
GRAHAM, J.; NOONAM, M. L. e LEW, K. V. - Yield states and stress/strain behaviour of natural soft clays. Géotechnique, 33(3), 1983.
LEROEIL, S. e VAUGHAM, P. R. - The general and congruent effects of structure in natural soils and weak rocks. Géotechnique 40, 1990.
MACHADO, S. L. e VILAR, O. M. - Modelagem numérica do comportamento volumétrico de um colúvio arenoso não compactado. Proc. 3° Simpósio Brasileiro sobre Solos não Saturados. Rio de Janeiro, 1997.
MACHADO, S. L. - Aplicação de conceitos elastoplasticidade a solos não saturados. Tese de Doutorado. EESC/USP, São Carlos - SP, 1998.
MATY AS, E. L. e RADHAKRISHNA, H. S. - Volume change characteristics of partially saturated soils. Géotechnique 18(4), 1968.
PACHECO SILVA, F. - Uma nova construção gráfica para a determinação da pressão de pré-adensamento de uma amostra de solo. Proc. V COBRAMSEF, Rio de Janeiro, 1970.
PARRY, R. H. G. e NADARAJAH, V. - A volumetric yield locus for lightly overconsolidated clay. Géotecnhique 23, 1973.
RÔHM, S. A. - Resistência ao cisalhamento de um solo arenoso laterizado não saturado da regiào de Sào Carlos- S.P. Tese de Doutorado, BESC/USP, São Carlos - SP, 1992.
TEIXEIRA, R. S. - Resistência ao cisalhamento de um solo arenoso compactado não saturado. Dissertação de mestrado. EESC/USP, São Carlos - SP, 1996.
