Effects of Load Duration and Stress Level on Deformation and Particle Breakage of Carbonate Sands

Abstract Time-dependent deformation of crushable soils attributable to particle breakage could dominate the postconstruction stability of high rockfill dams and pile foundations. The evolutionary trends of the volumetric strain, particle-size distribution (PSD), and particle breakage of carbonate sa...

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Bibliographic Details
Published in:International journal of geomechanics 2020-07, Vol.20 (7)
Main Authors: Xiao, Yang, Yuan, Zhengxin, Desai, Chandrakant S, Zaman, Musharraf, Ma, Qifeng, Chen, Qingsheng, Liu, Hanlong
Format: Article
Language:English
Subjects:
Carbonates
Compression
Compression tests
Dam foundations
Dam stability
Deformation
Deformation effects
Duration
Empirical equations
Fines
Levels
Particle size distribution
Pile foundations
Rockfill
Rockfill dams
Sand
Size distribution
Soil
Soil stability
Strain
Stress
Technical Note
Technical Notes
Time dependence
Vertical loads
Volumetric strain
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Summary:Abstract Time-dependent deformation of crushable soils attributable to particle breakage could dominate the postconstruction stability of high rockfill dams and pile foundations. The evolutionary trends of the volumetric strain, particle-size distribution (PSD), and particle breakage of carbonate sands with 10% fines content for various loading durations and vertical stress levels are investigated by performing a series of one-dimensional compression tests. Loading durations ranging from 1 to 10,000 min, vertical stress levels ranging from 200 to 3,200 kPa, and fines content percentages ranging from 0 to 20 are considered. The results indicate that the increased loading duration in the initial stage has a significant effect on the volumetric strain; however, as the loading duration increases, this effect gradually decreases. In addition, the PSD curve shifts upward as the loading duration increases, indicating that the amount of particle breakage increases accordingly. Both the loading duration and the vertical stress can induce PSD changes in carbonate sands. Empirical equations are proposed to describe the relationship between the relative particle breakage index and the loading duration as well as the relationship between the relative particle breakage index and the vertical stress.
ISSN:1532-3641
1943-5622
DOI:10.1061/(ASCE)GM.1943-5622.0001731