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Examination of Interface Asperity and Particle Shape on the Mechanical Behavior of Soil-Structure Interfaces Using 3D Printed Models

  • Geotechnical Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

The influence of surface topography on the mechanical behavior of soil-structure interfaces over a range of particle sizes and shapes is systematically investigated in this research. 3D printed interfaces with different topographies and uniformly graded 3D printed soil particles and two types of natural sands (Ottawa sand 20/30 and Dolomite sand #1, #2 and #3) were employed and tested. Laboratory investigations showed that the shear strength and volume change responses of the 3D printed interfaces are positively influenced with the increase of the inclination of asperities. The proposed wedge friction model successfully explained the distinct mechanical behaviors of soil-structure interfaces under shearing. A “turning point” was found for the interface shear resistance with the increase of the inclination of asperities. When the surface topography produces passive resistance to the soil, the change of the surface topography has little effect on the interface mechanical behavior. The findings from this research will provide insights for soil-structure interface design and discrete element method (DEM) simulations in considering the mechanical behavior of soil-structure interfaces.

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Abbreviations

D 50 :

Mean particle size

dh :

Increment of horizontal displacement

D r :

Initial relative density

dv :

Increment of vertical displacement

F :

Normal load

P :

Passive resistance

Q :

Horizontal force

R cr :

Critical relative roughness

R max :

Maximum height of asperity

R n :

Relative roughness

S h :

Particle shape parameter

δ :

Mohr-Coulomb interface friction angle

δ d :

Mobilized interface friction angle

δ if :

‘Isolated’ interface friction angle

δ p :

Peak interface friction angle

δ sf :

Angle of sliding friction

θ :

Dip angle of asperity

κ :

Interface shape factor

μ :

Friction coefficient

ξ :

Interface dilation angle

σ :

Normal stress

ς :

Dilatancy coefficient

τ :

Shear stress

τ max :

Peak shear stress

τsf :

Shear stress of sliding friction

φ :

Internal friction angle

ψ :

Internal dilation angle

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Acknowledgments

The present work was carried out with the support from the National Natural Science Foundation of China (51938005, 51808207), and High-level Talent of Innovative Research Team of Hunan Province, China (2019RS1030).

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Correspondence to Xin Kang.

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Kang, X., Lei, H. & Chen, R. Examination of Interface Asperity and Particle Shape on the Mechanical Behavior of Soil-Structure Interfaces Using 3D Printed Models. KSCE J Civ Eng 25, 386–397 (2021). https://doi.org/10.1007/s12205-020-2131-6

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  • DOI: https://doi.org/10.1007/s12205-020-2131-6

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