Frictional characteristics of kaolin clay under different drainage conditions and shear speeds

Yi Wei Lee, Che Ming Yang, Jia Jyun Dong

Research output: Contribution to journalArticlepeer-review

Abstract

This study aims at exploring the influences of shear velocity and drainage conditions on the strength of kaolin clay. A low to high velocity rotary shear apparatus was used to measure the apparent friction coefficient of wet kaolin clay under a normal stress of 1 MPa. The shear velocity ranged from 10-6 to 1 m/s. The drainage conditions include radial, single and double drainage conditions. The results show a lower strength for the radial drainage condition (close to the undrain condition) than the ones measured under single drainage test conditions covering the whole velocity spectrum. Notably, the friction coefficient dropped rapidly in the early stage (<200 s) of radial drainage condition but increased gradually, which can be related to the excess pore pressure dissipation. The results of this study are relevant to the study of large landslides, from creeping tuning to catastrophic failure.

Original languageEnglish
Pages (from-to)191-199
Number of pages9
JournalJournal of Chinese Soil and Water Conservation
Volume47
Issue number4
StatePublished - 1 Dec 2016

Keywords

  • Excess pore water pressure
  • Friction coefficient
  • Kaolin clay/kaolinite
  • Shear speed

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