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Ingeniare. Revista chilena de ingeniería

versión On-line ISSN 0718-3305

Ingeniare. Rev. chil. ing. v.16 n.3 Arica dic. 2008

http://dx.doi.org/10.4067/S0718-33052008000300009 

 

Ingeniare. Revista chilena de ingeniería, vol. 16 Nº 3, 2008, pp. 461-472

COMPORTAMIENTO DE UN MATERIAL GRANULAR NO TRATADO EN ENSAYOS TRIAXIALES CÍCLICOS CON PRESIÓN DE CONFINAMIENTO CONSTANTE Y VARIABLE

 BEHAVIOR OF AN UNBOUND GRANULAR MATERIAL IN CYCLIC TRIAXIAL TESTS WITH CONSTANT AND VARIABLE CONFINING PRESSURE

Hugo Alexander Rondón Quintana1               Torsten Wichtmann2               Theodoros Triantafyllidis3
Arcesio Lizcano Peláez4

 

1 Departamento de Ingeniería Civil. Universidad de los Andes. Carrera 1. Este Nº 19 A-40, Edificio Mario Laserna, Piso 6, Bogotá D.C. Colombia. E-mail: h-rondon@uniandes.edu.co
2
Institute of Soil Mechanics and Rock Mechanics. University of Karlsruhe. Engler-Bunte-Ring 14, 76131. Karlsruhe, Germany. E-mail:  Torsten.Wichtmann@ibf.uni-karlsruhe.de
3
Institute of Soil Mechanics and Rock Mechanics. University of Karlsruhe. Engler-Bunte-Ring 14, 76131. Karlsruhe, Germany. E-mail: Triantafyllidis@ibf.uni-karlsruhe.de
4
Departamento de Ingeniería Civil. Universidad de los Andes. Carrera 1. Este Nº 19 A-40, Edificio Mario Laserna, Piso 6. Bogotá D.C., Colombia. E-mail: alizcano@uniandes.edu.co



RESUMEN 

En un pavimento, cada una de las capas de la estructura experimenta bajo una carga vehicular ciclos de esfuerzo con componentes vertical, horizontal y de corte. Para el estudio de materiales granulares no tratados (utilizados para conformar capas de base y subbase), la mayor parte de las investigaciones se realizan empleando equipos triaxiales cíclicos en donde sólo la carga vertical es cíclica y la presión de confinamiento permanece constante durante el ensayo. Un ensayo que reproduce mejor la forma como se distribuyen los esfuerzos en estas capas es el ensayo triaxial cíclico con presión de confinamiento variable. En este ensayo se pueden modelar las componentes cíclicas tanto en el sentido vertical como horizontal. A pesar que son ensayos distintos, la ingeniería de pavimentos supone que la respuesta que experimentan estos materiales en estos ensayos es similar, lo anterior basado en algunos estudios realizados en la década de los setenta. En la presente investigación se diseña y desarrolla un programa experimental más detallado, para comparar el comportamiento que desarrolla un material granular no tratado en estos ensayos. De los resultados se evidencia que sólo para algunas trayectorias de esfuerzo, la dirección y la acumulación de la deformación vertical y volumétrica es similar.

Palabras clave: Materiales granulares no tratados, deformación permanente, ensayos triaxiales cíclicos.

 
ABSTRACT 

In a pavement structure, passing wheel loads impose cyclic stresses consisting of vertical, horizontal and shear components. Studies of the behavior of unbound granular materials (UGM, used for base and sub-base layers) under cyclic loading are mostly performed using the axisymmetric triaxial test with constant confining pressure (CCP test) and a cyclic variation of the axial stress. However, in this type of test only the vertical component of the cyclic stress path is considered. The oscillation of the horizontal stress can be reproduced by an additional cyclic variation of the confining pressure (VCP test). CCP and VCP tests are sometimes assumed to deliver similar residual and resilient deformations as long as the average stress is the same in both types of tests. However, this assumption is based on limited test data in the literature. The present paper documents a more detailed comparative study with CCP and VCP tests. The results show that only for some special stress paths both types of test deliver similar permanent axial or volumetric deformations.

Keywords: Unbound granular materials, permanent deformation, cyclic triaxial tests.


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Recibido 5 de junio de 2008, aceptado 3 de octubre de 2008

 

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