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Resilient behaviour of non standard unbound granular materials

The results of experimental work on three non-standard granular materials used in road construction are presented. Small strain precision triaxial tests under cyclic loading and wetting tests were performed on all samples. The materials’ state parameters studied included: Los Angeles abrasion coefficient, Plasticity Index, and fines content above allowed limits. The influence of each parameter and the influence...

Características de deformabilidade e influência da não saturação em materiais g...

Neste artigo, apresentam-se as características de deformabilidade para dois materiais com a mesma origem geológica: um agregado granítico (0/12.5; D50=0.52mm) e uma areia siltosa designada de areia de Perafita (0/6.35; D50=0.36mm). A rigidez, dos materiais compactados, no domínio das pequenas deformações (<10-5) é estudada através de ensaios triaxiais de precisão. A influência da não saturação na deformabilidad...

Effect of the filter paper calibration on the soil-water retention curve of an ...

The soil suction is a key variable in the analysis of the hydro-mechanical behavior of unsaturated soils. The filter paper method (FPM) calculates soil suction indirectly by measuring the gravimetric water content of the filter paper at equilibrium that is related to soil suction through a predetermined calibration curve. The matric suctions inferred from FPM depend on the calibration between the water content ...

Advanced triaxial technologies and modelling parameters

Comportamiento de los agregados de Bogotá ante cargas cíclicas

The results of an experimental work on three road granular materials from La Sabana de Bogotá are presented. These works include small strains precision triaxial tests under cyclic loading with measurement of the negative pore water pressure (suction). The influence of different initial conditions of density, water content and fines content was studied. The interpretation of the results, in the quasi-elastic do...

Filter paper method of soil suction measurement

The capillary pressure of the soil (i.e., the pressure difference between air and water components in soil voids) is a key variable in the analysis of the hydro-mechanical behavior of unsaturated soils. Therefore a simple and economical laboratory method for the measurement of the capillary pressure of the soil (also known as soil matric suction, the reference being the atmospheric pressure), even if a degree o...

Influence of non-saturation and particle size distribution on the stiffness of ...

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 t...

Influence of suction on the properties of two granular road materials

The results of an experimental work on two road granular materials are presented, including small strains precision triaxial tests under cyclic loading, large strains triaxial tests with measurement of the negative pore water pressure (suction) and wetting tests. The influence of different initial conditions of density, water content and fines content was studied. The two materials differ by their fine contents...

Uma abordagem à modelação de solos não saturados

Os geomateriais das camadas dos pavimentos e das vias-férreas, bem como os das respectivas fundações, encontram- se no estado não saturado nas boas condições de serviço destas infra-estruturas. Torna-se por isso necessário considerar o aspecto não saturado destes materiais na modelação e no dimensionamento destas infra-estruturas. O presente artigo propõe a generalização do conceito de tensão efectiva para solo...