Influence of dilatancy on shear band characteristics of granular backfills

Soltanbeigi, Behzad; Altunbas, Adlen; Çinicioğlu, Özer

doi:10.1080/19648189.2019.1572542

Cited by 6 publications

(1 citation statement)

References 32 publications

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“…Through the transparent side walls, photographic images of the backfill at different stages of wall deformation can be captured for examination. Obtained images are analyzed using PIV method, which led to visualized passive failure surfaces [32][33][34][35][36]. The model retaining wall is an aluminium plate with rectangular cross-section.…”

Section: The Retaining Wall Modelmentioning

confidence: 99%

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Soltanbeigi

Altunbas

Gezgin

et al. 2020

Period. Polytech. Civil Eng.

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Correct determination of the passive failure surface geometry is necessary for the design of retaining structures. The conventional theories assume linear passive failure surfaces even though it is known that the actual failure surfaces are non-linear. Many researchers claimed the appropriateness of a hybrid curved-linear method. This approach estimates the curved section by a log-spiral function, which then connects to the backfill surface with the conventional linear assumption. The main drawback here is that the geometric properties of the hybrid mathematical function is not directly related to the mechanical properties of soils. Thus, this study attempts to provide a mechanical description for the assumed geometrical parameters. For this purpose, a series of 1 g small scale retaining wall model tests, simulating passive failure, are conducted on two different backfill soils. The relative density is varied in the model tests and the resultant peak friction angles of the backfills are calculated as functions of failure stress state and relative density using a well-known empirical equation. Transparent sidewalls allow for visualization of the failure surface evolution, which is obtained by capturing images and analysing then through Particle Image Velocimetry (PIV) technique. Subsequently, the quantified slip zones are fitted with the hybrid curved-linear approach. The relationships between the peak friction angle and the geometrical characteristics of the best-fit log-spiral and linear functions are investigated. Obtained results are used to propose a set of equations that allow the estimation of non-linear passive failure surfaces as function of peak friction angle.

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