Experimental and DEM study of monotonic and cyclic simple shear testing of an angular sand

Matteo O. Ciantia (Lead / Corresponding author), Marco Previtali, Tolga Cakir

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Abstract

Liquefaction of sandy soils under monotonic and cyclic shear loadings is responsible for numerous devastating failures of earth structures and hence represents a significant hazard. In this paper, cyclic and monotonic loading of an angular sand is replicated in the laboratory using a Cyclic Simple Shear apparatus and numerically using the discrete element method (DEM). For both the experiments and the DEM simulations, undrained conditions were attained by imposing a constant volume approach. A large series of tests, starting from an initial dense state and from two different effective vertical stress conditions, are performed. To obtain a comprehensive Cyclic Stress Ratio (CSR) - number of cycles to liquefaction diagram, from each of these initial states the undrained cyclic tests are conducted using three different shear load magnitudes. The three-dimensional DEM model developed is used to guide the interpretation of the experimental results and to investigate micromechanical processes involved during the cyclic shearing of the angular sand analogue as it approaches liquefaction. To interpret the results using the state parameter (ψ) concept, both drained and undrained monotonic simple shear tests were performed both experimentally and numerically to identify the critical state line.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021
Place of PublicationSydney
PublisherAustralian Geomechanics Society
Pages661-666
Number of pages6
ISBN (Electronic)9780994626141
Publication statusPublished - May 2022
Event20th International Conference on Soil Mechanics and Geotechnical Engineering 2022 - International Convention Centre, Sydney, Australia
Duration: 1 May 20225 May 2022
https://icsmge2022.org/

Conference

Conference20th International Conference on Soil Mechanics and Geotechnical Engineering 2022
Abbreviated titleISSMGE
Country/TerritoryAustralia
CitySydney
Period1/05/225/05/22
Internet address

Keywords

  • Cyclic Simple Shear
  • Liquefaction
  • Angular Sands
  • Particle shape
  • Discrete Element Method

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