masterThesis
Comportamento drenado e não drenado de uma areia eólica de Natal/RN
Fecha
2019-06-21Registro en:
SOUZA JÚNIOR, Paulo Leite. Comportamento drenado e não drenado de uma areia eólica de Natal/RN. 2019. 77f. Dissertação (Mestrado em Engenharia Civil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Souza Júnior, Paulo Leite
Resumen
The behavior of sands under various loading conditions has been study object
in de last decades. Constitutive models able to simulate the behavior of sands
have been formulated into the Critical State framework. Researchers showed
that the Critical State Line (CSL) can be obtained by drained and undrained
tests in samples with different initial densities. This work aims to check drained
and undrained behavior of a eolic sand of Natal/RN into the Critical State Soil
Mechanics. The drainded and undrained tests were carried out with samples at
relative densities iqual to 0%, 47% and 95%, which corresponds to loose,
moderately dense and dense states, repectivelly. Tests were conducted under
confining pressures of 50, 100, 200 and 300 kPa to each molding void ratio.
The results showered that a CSL was defined from drained and undrained test
in loose and moderated dense sand. The samples of dense sand were not
used to define de CSL considering that critical state was not attained at a axial
deformation of 20%. The Critical State parameters was obtained using the
projections in p’-q and lnp’-v planes. The critical state friction angle of 31,5° is
consistent with clean, angular to subangular, quartzite an uniform sands. The
obtained M, Γ e λ values are equal to 1.26, 1.863 and 0.03, respectively. The
obtained parameters will be used in analyses and numerical simulations of the
geotechnical structures built on the aeolian dune deposits from the city of
Natal/RN.