Effect of infill on the shear behaviour of soft joints

B. Indraratna, A. Haque, N. Aziz

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


The shear behaviour of soft simulated joints is investigated in the laboratory under constant normal stiffness conditions by using a large-scale shear apparatus. Tests were conducted on regular saw tooth joints having inclinations of 9.5°and 18.5°under a given initial normal stress. Commercial bentonite was used as an infill material between the interfaces, which were sheared at a constant rate. It is observed that the shear strength of infilled joints decreases dramatically in comparison to unfilled joints with the addition of very small thickness of infill. As the infill thickness to asperity height ratio is increased to a certain value, the shear behaviour of the joints becomes almost similar to the infill itself. In this study, a t/a ratio of 1.40 is observed as 'critical', beyond which the joint behaviour changes from a dilatant to a compressive mode.

Original languageEnglish
Title of host publicationThe geotechnics of hard soils - soft rocks. Proceedings of the second international symopsium on hard soils-soft rocks, Naples, October 1998. (Two volumes).
EditorsA. Evangelista, L. Picarelli, A. Evangelista, L. Picarelli
PublisherA A Balkema
Number of pages8
ISBN (Print)9058090183
Publication statusPublished - 1 Dec 1998
Externally publishedYes
EventProceedings of the second international symposium on hard soils-soft rocks 1998. - Naples, Italy
Duration: 12 Oct 209814 Oct 2098


ConferenceProceedings of the second international symposium on hard soils-soft rocks 1998.

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