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Long-term behaviour and degradation of calcareous sand under cyclic loading
Shao-Heng He1,2; Zhi Ding1,3; Tang-Dai Xia2; Wan-Huan Zhou3; Xiao-Lu Gan2; Yong-Zhan Chen3; Fan Xia2
2020-07-18
Source PublicationEngineering Geology
ISSN0013-7952
Volume276
Abstract

Calcareous 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 (ε1acc) 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 ζc, that represents the cyclic stress path reaching the CSL, is proposed. When ζ>ζc, the growth rate of ε1acc with ζ increases drastically. Moreover, when the cyclic stress path approaches the SSE, ε1acc enters an incremental collapse state. The increase in p’ diminishes the dilatancy of the volumetric strain εv. However, this response of εv reverses from decreasing to increasing with increasing ζ. The resilient modulus (Mr) increases with the number of cycles (N) due to the initial densification. If εv dilation occurs, Mr 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 ε1acc and Mr are established. Furthermore, particle degradation significantly worsens ε1acc and εv, but has a more profound effect on the compressibility of εv. This degradation is also detrimental to Mr. A certain deviation trend of the predicted values from the measured values is found to correspond with the relative particle breakage.

KeywordCalcareous Sand Long-term Behaviour Cyclic Loading Degradation Particle Breakage Empirical Model
DOI10.1016/j.enggeo.2020.105756
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000576189100007
PublisherELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS
Scopus ID2-s2.0-85088389964
Fulltext Access
Citation statistics
Cited Times [WOS]:20   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorZhi Ding
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
Shao-Heng He,Zhi Ding,Tang-Dai Xia,et al. Long-term behaviour and degradation of calcareous sand under cyclic loading[J]. Engineering Geology,2020,276.
APA Shao-Heng He,Zhi Ding,Tang-Dai Xia,Wan-Huan Zhou,Xiao-Lu Gan,Yong-Zhan Chen,&Fan Xia.(2020).Long-term behaviour and degradation of calcareous sand under cyclic loading.Engineering Geology,276.
MLA Shao-Heng He,et al."Long-term behaviour and degradation of calcareous sand under cyclic loading".Engineering Geology 276(2020).
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