CUED Publications database

New insights into the micromechanics of soft clay shearing on rough and smooth interfaces

Kuo, MYH (2015) New insights into the micromechanics of soft clay shearing on rough and smooth interfaces. Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014, 2. pp. 1043-1047.

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Abstract

This paper presents new data on the behaviour of very soft, normally consolidated marine soil and slurry shearing against rough and smooth interfaces in a modified low-stress direct shear apparatus. A new semi-circular PTFE shear box with an acrylic window is used to permit imaging of the soil shearing both within the soil mass and at the interface. Imaging is undertaken using macrophotography thus allowing high quality images to be processed and analysed using article image velocimetry. The results show that when shearing against a rough interface with a conventional direct shear apparatus, interlocking of the soil to the interface initially occurs, generating a complicated system of tension cracks that propagate from the soil-interface boundary into the soil mass. This stage of shearing corresponds to the generation of peak interface strength. After 5 to 10mm of shearing, a shear zone develops at the soil-interface boundary resulting in the entire soil mass moving at the input shear rate. When shearing against the smooth interface, no interlocking is observed, resulting in the entire soil mass moving at the input shear rate from the start of the test. The influence of shearing rate (fast and slow) is also investigated. © 2015 Taylor & Francis Group.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:16
Last Modified: 10 Aug 2017 01:37
DOI: