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A rockfill triaxial cell with suction control

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10.1520/GTJ101590
 
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hdl:2117/10974

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Chavez, C.
Romero Morales, Enrique EdgarMés informacióMés informacióMés informació
Alonso Pérez de Agreda, EduardoMés informacióMés informació
Document typeArticle
Defense date2009-05
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
This paper describes the development of a new triaxial cell specifically built to test coarse granular material under partially saturated conditions. The partial saturation is achieved by imposing a total suction that is correlated with the relative humidity. Relative humidity control was achieved by water vapor transfer using a forced convection system, which is driven by an air pump transporting the air humidity to the sample, and it is controlled by saturated saline solutions placed in a vessel.A double-wall cell was designed to monitor global volume changes of the material on compression and shearing. In addition, the cell uses a novel technique to measure local axial and radial deformations. The use of both global and local measurements allows detecting experimental problems such as membrane penetration on isotropic compression and shearing, as well as membrane sliding on shearing at low confining stresses. Selected test results are presented to show the capability of the cell during isotropic compression and shearing made with strain and stress control. The results of the test with strain control show a nonlinear increase in strength and dilatancy of the material in relation to the decrease of the relative humidity. Also they have a tendency to reach the critical state, and it can be seen that such a critical state line is a function of the relative humidity. Under a constant deviator stress, a collapse test of the rockfill was carried out and the results showed that the deformation depends strongly on the time. Furthermore, it is larger than that produced by making a test under saturated conditions, commonly taken as final reference.
CitationChavez, C.; Romero, E.; Alonso, E. A rockfill triaxial cell with suction control. "Geotechnical Testing journal", Maig 2009, vol. 32, núm. 3, p. 219-231. 
URIhttp://hdl.handle.net/2117/10974
DOI10.1520/GTJ101590
ISSN0149-6115
Publisher versionhttps://www.astm.org/gtj101590.html
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  • Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica (fins octubre 2015) - Articles de revista [239]
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