Geomechanics and Engineering

  • 제25권4호
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  • Pages.275-282
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  • 2021
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Microstructural observations of shear zones at cohesive soil-steel interfaces under large shear displacements

  • Mamen, Belgacem (Department of Civil Engineering, Faculty of Science and Technology, University Abbes Laghrour of Khenchela) ;
  • Hammoud, Farid (Department of Civil Engineering, Faculty of Technology, University Mustapha Ben Boulaid of Batna)
  • 투고 : 2020.11.05
  • 심사 : 2021.04.27
  • 발행 : 2021.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

Failure mechanism which can affect geotechnical infrastructures (shallow foundations, retaining walls, and piles) constitutes one of the most encountered problems during the design process. In this respect, the shear behavior of interfaces between grained soils and solid building materials, as well as those between cohesive soils should be investigated. Therefore, a range of ring shear tests with different cohesive soils and stainless-steel interfaces have been carried out through the Bromhead apparatus that allows simulating large displacements along a failure surface. The effects of steel rings roughness and soil type on the residual friction coefficient and the shear zone features (structure, thickness, and texture orientation angle) have been investigated using the Scanning Electron Microscopy. The obtained results indicate that the residual friction coefficient and the structural characteristics of the shear zone vary according to the surface roughness and the soil type. Scanning electron microscopy reveals that the particles inside the shear zone tend to be re-oriented. Also, the shear failure mechanism can be identified along with the interface, within the soil, or simultaneously at the interface and within the soil specimen.

키워드

과제정보

The work presented in this paper has been supported by Abbes Laghrour University (Khenchela, Algeria) and Mustapha Ben Boulaid University (Batna, Algeria). Their support is gratefully acknowledged.

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