Long-term behaviour and degradation of calcareous sand under cyclic loading
He,Shao Heng1,2; Ding,Zhi1,3; Xia,Tang Dai2; Zhou,Wan Huan3; Gan,Xiao Lu2; Chen,Yong Zhan3; Xia,Fan2
Source PublicationEngineering Geology
AbstractCalcareous sand has been used as the main filling material in numerous reef constructions. Therefore, understanding its long-term dynamic engineering geological characteristics under cyclic applications of traffic or wave loading is crucial to the design and prediction of the serviceability of reef infrastructures. Considering this, seven monotonic triaxial tests and 33 high-cycle (25,000 cycles) drained triaxial tests were conducted on calcareous sand with various mean effective stresses (p’) and cyclic stress ratios (ζ). The results show that the development of the accumulated axial strain (ε) has a strong correlation with the positional relationship between the cyclic stress path and critical strength line (CSL) or static strength envelope (SSE) in the p’-q plane. The critical cyclic stress ratio ζ, that represents the cyclic stress path reaching the CSL, is proposed. When ζ>ζ, the growth rate of ε with ζ increases drastically. Moreover, when the cyclic stress path approaches the SSE, ε enters an incremental collapse state. The increase in p’ diminishes the dilatancy of the volumetric strain ε. However, this response of ε reverses from decreasing to increasing with increasing ζ. The resilient modulus (M) increases with the number of cycles (N) due to the initial densification. If ε dilation occurs, M will decrease with N as particles lose contact. A single parameter for the cyclic stress path ratio (ψ) considering the effects of p’, ζ, and SSE is proposed. Additionally, empirical formulas for calculating the ultimate ε and M are established. Furthermore, particle degradation significantly worsens ε and ε, but has a more profound effect on the compressibility of ε. This degradation is also detrimental to M. A certain deviation trend of the predicted values from the measured values is found to correspond with the relative particle breakage.
KeywordCalcareous sand Cyclic loading Degradation Empirical model Long-term behaviour Particle breakage
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Cited Times [WOS]:2   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorDing,Zhi
Affiliation1.Department of Civil Engineering,Zhejiang University City College,Hangzhou,China
2.Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,China
3.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering,University of Macau,Macau,China
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
He,Shao Heng,Ding,Zhi,Xia,Tang Dai,et al. Long-term behaviour and degradation of calcareous sand under cyclic loading[J]. Engineering Geology,2020,276.
APA He,Shao Heng,Ding,Zhi,Xia,Tang Dai,Zhou,Wan Huan,Gan,Xiao Lu,Chen,Yong Zhan,&Xia,Fan.(2020).Long-term behaviour and degradation of calcareous sand under cyclic loading.Engineering Geology,276.
MLA He,Shao Heng,et al."Long-term behaviour and degradation of calcareous sand under cyclic loading".Engineering Geology 276(2020).
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