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Effect of microstructure on shear strength and dilatancy of unsaturated loess at high suctions

Ng, C. W. W ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1139/cgj-2018-0592
  3. Publisher: Canadian Science Publishing , 2020
  4. Abstract:
  5. To investigate the influences of microstructure changes on dilatancy of unsaturated loess at high suctions, a direct shear box device using the vapour equilibrium technique was used. Through conducting two series of direct shear tests on both intact and recompacted loess specimens and also investigating microstructural changes using the mercury intrusion porosim-etry (MIP) technique, a linear increase in dilatancy with suctions ranging from 8 to 230 MPa can be identified at different net stresses. The enhanced dilatancy observed is mainly attributed to desiccation-induced high suctions as the reduction in void ratio due to enhancement of suction was negligible. A macrovoid ratio, eM, may be quantified and proposed to explain the differences in the increased dilatancy of recompacted and intact loess with suction. © 2020, Canadian Science Publishing. All rights reserved
  6. Keywords:
  7. Dilatancy ; High suction ; Loess ; Microstructure ; Void ratio ; Sediments ; Microstructure changes ; Unsaturated loess ; Vapour equilibrium ; Void ratios ; Shear flow ; Shear strength ; Shear test ; Suction ; Unsaturated medium
  8. Source: Canadian Geotechnical Journal ; Volume 57, Issue 2 , February , 2020 , Pages 221-235
  9. URL: https://cdnsciencepub.com/doi/10.1139/cgj-2018-0592