Investigating the long-term deformation behaviour and non-coaxiality of siliceous sand under traffic cyclic loading

•Dependence of long-term cyclic behaviors and non-coaxiality under heart-shaped traffic loads on the ζ and ηd is revealed.•An increase in ζ and ηd results in ε1acc and M, along with increased susceptibility to volumetric contraction.•The overall deformation accumulation direction and stress-dilatanc...

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Veröffentlicht in:Construction & building materials 2023-12, Vol.408, p.133672, Article 133672
Hauptverfasser: Ding, Zhi, Chen, Yang, He, Shao-Heng, Sun, Miao-Miao
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Sprache:eng
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Zusammenfassung:•Dependence of long-term cyclic behaviors and non-coaxiality under heart-shaped traffic loads on the ζ and ηd is revealed.•An increase in ζ and ηd results in ε1acc and M, along with increased susceptibility to volumetric contraction.•The overall deformation accumulation direction and stress-dilatancy relationship within individual cycle are assessed.•A systematic interpretation on the non-coaxiality behaviors under anisotropic heart-shaped stress path is conducted. Subgrades composed of siliceous sand are often subjected to traffic-induced cyclic loads. However, there is a knowledge gap regarding the long-term deformation behaviour and non-coaxiality of siliceous sand under high-cyclic traffic loading. This study addresses this issue by conducting a series of drained high-cyclic tests using a hollow cylinder apparatus to simulate an anisotropic heart-shaped stress path. The effects of cyclic stress ratio (ζ) and torsion-shear stress ratio (ηd) were carefully evaluated and interpreted. The results showed that an increase in ζ and ηd results in a higher axial cumulative strain and resilient modulus, along with increased susceptibility to volumetric contraction. The dilatancy d (dεvacc/dεqacc) characterizing overall deformation accumulation experienced a transformation of first stabilizing then declining. By contrast, the individual stress-dilatancy relations within loading and unloading stages exhibited an inward movement trend. Moreover, the development and influencing factors of non-coaxiality were meticulously analysed, revealing that while the number of loading cycles had a negligible effect on non-coaxiality behaviour, it was considerably influenced by stress levels. A significant increase in the range of non-coaxiality angle variation was observed at larger ζ and ηd values. This study provides insights for the construction and design of tunnel foundations and pavement engineering.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2023.133672