Skip to main content
placeholder image

Effect of infill on the shear behaviour of soft joints

Conference Paper


Abstract


  • 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.

UOW Authors


Publication Date


  • 1998

Citation


  • Indraratna, B., Haque, A., & Aziz, N. (1998). Effect of infill on the shear behaviour of soft joints. In The geotechnics of hard soils - soft rocks. Proceedings of the second international symopsium on hard soils-soft rocks, Naples, October 1998. (Two volumes). (pp. 199-206).

Scopus Eid


  • 2-s2.0-0032471488

Web Of Science Accession Number


Start Page


  • 199

End Page


  • 206

Abstract


  • 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.

UOW Authors


Publication Date


  • 1998

Citation


  • Indraratna, B., Haque, A., & Aziz, N. (1998). Effect of infill on the shear behaviour of soft joints. In The geotechnics of hard soils - soft rocks. Proceedings of the second international symopsium on hard soils-soft rocks, Naples, October 1998. (Two volumes). (pp. 199-206).

Scopus Eid


  • 2-s2.0-0032471488

Web Of Science Accession Number


Start Page


  • 199

End Page


  • 206