- Title
- Experimental study of the shear behaviour of a rough discontinuity infilled by different minerals
- Creator
- Jeffery, M.; Fityus, S.; Delahunty, J.; Giacomini, A.
- Relation
- Rock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019. Proceedings of The 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019 (Foz Do Iguassu, Brazil 13-18 September, 2019) p. 2097-2104
- Relation
- https://www.taylorfrancis.com/books/edit/10.1201/9780367823177/rock-mechanics-natural-resources-infrastructure-development-full-papers-sergio-fontoura-ricardo-rocca-jos%C3%A9-mendoza
- Publisher
- CRC Press
- Resource Type
- conference paper
- Date
- 2020
- Description
- The effects of commonly encountered mineral infills on shearing behaviour and shear strength development has not been extensively investigated, highlighting a need for further work. This paper compares the results obtained from a series of direct shear tests using replicates of a natural rock joint, infilled with various minerals at different thickness to amplitude ratios, to gain an understanding of the effects that different minerals have on the shear behaviour and development of shear strength of rock discontinuities. It was observed that even very thin coatings (~0.2 mm) of mineral infill can significantly reduce peak shear strength. More interestingly, at this thickness the coating can cause either a decrease or increase in residual shear strength. A positive correlation was established between the hardness and the residual friction angle of the minerals. Increasing the thickness of the infill continues to reduce the shear strength. As the thickness approaches the average maximum amplitude of the surface, the shear strengths of the infilled joint converge to the shear strength of the infill material. For the studied surface, the critical thickness to amplitude ratio was estimated to be 1.0 to 1.2.
- Subject
- minerals; shear behaviour; rock discontinuity; strength
- Identifier
- http://hdl.handle.net/1959.13/1462806
- Identifier
- uon:46566
- Identifier
- ISBN:9780367422844
- Language
- eng
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