Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/12280

TitleInfluence of non-saturation and particle size distribution on the stiffness of granite materials
Other titlesInfluencia de la no saturación y granulometría en la rigidez de materiales de naturaleza granítica
Author(s)Correia, A. Gomes
Ferreira, Sandra Reis
Fleureau, Jean-Marie
KeywordsUnsaturated soils
Triaxial tests
Suction
Effective stress
Terzaghi’s and Bishop’s
Issue date2007
CitationPANAMERICAN CONFERENCE ON SOIL MECHANICS AND GEOTECHNICAL ENGINEERING, 13, Isla Margarita, 2007 – “Proceeding of XIII Panamerican Conference on Soil Mechanics and Geotechnical Engineering”. [S.l : s.n., s.d.].
Abstract(s)In this paper, the stiffness of two materials with the same geological origin is presented, a silty sand, called Perafita sand (D50=0.36mm) and a granite aggregate (0/12.5, D50=0.52mm). The stiffness in very small strains ( <10-5) of the compacted materials is studied by means of precision triaxial tests (with local strain measurements). The influence of non-saturation on the stiffness is also studied through triaxial tests with measurement of negative pore water pressures. Such measurements allow the analysis of the mechanical behaviour of the unsaturated material in terms of effective stresses. For this purpose two approaches were used: the Terzaghi’s and Bishop’s approaches. The results obtained show, for each material, a unique relationship between vertical stiffness and vertical effective stress (constant void ratio = 0.5), independently of the saturation degree of the studied samples.
En este artículo se presenta la rigidez de dos materiales con el mismo origen geológico, una arena con limo, llamada arena Perafita (D50=0.36mm) y un agregado granítico (0/12.5, D50=0.52mm). La rigidez para deformaciones muy pequeñas ( <10-5) de los materiales compactados es estudiada mediante ensayos triaxiales de precisión (con medidas locales de deformación). La influencia de la no-saturación en la rigidez se ha estudiado también mediante ensayos triaxiales con medición de la presión negativa del agua en los poros. Estas medidas permiten el análisis del comportamiento mecánico de materiales no saturados por lo que se refiere a tensiones efectivas. Con este propósito fueron usados dos procedimientos: el de Terzaghi y el de Bishop. Los resultados obtenidos revelan, para cada material, una relación única entre la rigidez vertical y la tensión efectiva vertical (ratio de vacíos constante = 0.5), independientemente del grado de saturación de las muestras estudiadas.
TypeConference paper
URIhttp://hdl.handle.net/1822/12280
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEC-GEO - Comunicações a Conferências Internacionais

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