Abstract
The interface between steel and sand can be regard as a steel-sand system, and its mechanical properties have an important role in many geotechnical applications. The mechanical properties of various steel-sand interfaces classified by sand mean particle size D50 were investigated through interface shear tests. The results show that for a given steel-sand interface, the peak strength of the interface increase with increasing axial pressure. As the D50 value increases, the cohesions for steel-sand interfaces decrease, while the friction angles of the interfaces first increase and then decrease. In the process of shearing, the shrinkage of steel-sand interface occurs, mainly due to the broken of sand particles. The decrease in interface friction coefficients due to an increase in axial pressure was observed. Particle size distribution has a significant effect on the interface friction coefficient of steel-sand interface. When the average particle size D50 changes from 0.1 mm to 0.47 mm, the friction coefficient of steel-sand interface increases by 134%-161%.
Highlights
The testing of soil-structure interfaces plays an important role in the analysis of geotechnical applications such as pile foundations, retaining walls, and earth reinforcement[1]
The effects of sand particle size gradation on the interface mechanical properties were investigated by analyzing the relationships between mean particle size D50 and steel-sand interface parameters
For a given axial pressure, the coarser the sand particle is, the larger the shear strength of the interface is. This is because the surface roughness and movement form of sand particles with different particle sizes are different, resulting in different shear characteristics of the steel-sand interface
Summary
The testing of soil-structure interfaces plays an important role in the analysis of geotechnical applications such as pile foundations, retaining walls, and earth reinforcement[1]. These applications rely on the mechanical properties of the interfaces between different soils (sand, clay, and gravel) and structural materials (steel, concrete, wood, and geosynthetic). The effects of sand particle size gradation on steel-sand interface mechanical properties have rarely been investigated. The effects of sand particle size gradation on the interface mechanical properties were investigated by analyzing the relationships between mean particle size D50 and steel-sand interface parameters (cohesion, friction angle, and friction coefficient). The relationship between axial displacement and horizontal displacement was obtained, and it can be found that the shrinkage of steel-sand interface occurs in the process of shearing, mainly due to the broken of sand particles
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