Study on the Influence of Roughness on the Strength and Volume Change Behaviors of Sand-Steel Interfaces

Document Type : Research Paper

Authors

Geotechnical Department, Faculty of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran

Abstract

The bearing capacity of piles shaft and stability of retaining walls and reinforced soil structures depend on the behavior of soil-structure interfaces. Using direct shear apparatus, behavior of a sand with fine angular grains was studied. Steel plates with two surface roughness values were separately embedded at the lower half of the shear box and consequently, the upper half was filled with dense or loose sand. Then, the behavior of interfaces forming between dense/loose sand and rough/medium rough steel plates was studied. Tests show that the shear strength and dilation in sand-structure interfaces are significantly less than the corresponding values for sand. In this regard, the peak friction angle of rough steel plate in contact with dense and loose samples is, respectively, about 40 and 25 percent less than those of dense and loose sand. In a similar fashion, the peak friction angle of medium rough steel plate in contact with dense and loose samples is about 60 and 45 percent less than those in dense and loose sand, respectively.

Keywords

References

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