Macro–meso freeze–thaw damage mechanism of soil–rock mixtures with different rock contents
Soil–rock mixture is a typical discontinuous material and often used as a roadbed filler. Rock content is a key factor in this mixture’s properties. The damage pattern of soil–rock mixtures with different rock contents after freeze–thaw cycles is more complicated than that in normal state. The damage behaviour of soil–rock mixtures with different rock contents after freeze–thaw cycles is analysed in this study. Firstly, size-distributed subgrade coarse grained soil samples with different rock contents (35, 45, 55 and 65%) are prepared. The samples are subjected to freeze–thaw cycles periodically (24 h per cycle) for different times (0 and 10). Large-scale indoor triaxial tests are performed, and elastic modulus and shear strength are determined. Secondly, the macro-properties of the soil–rock mixtures with different rock contents are compared under normal and freeze–thaw states. Finally, indoor triaxial experiments are numerically simulated with Particle Flow Code software. Matched results are obtained, and the meso-mechanism of the soil–rock mixtures with different rock contents is elucidated. At the macroscale, the elastic modulus and shear strength of the soil–rock mixture decrease after the freeze–thaw cycles, and the decrement trends differ with different rock contents. At the mesoscale, the freeze–thaw cycles reduce the strength of soil–rock particles with different properties. The soil–rock mixture with 55% rock content exhibits the most severe damage among all mixtures; this mixture has the most soil–rock particle contacts because of its good compactness and skeleton structure.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/44544515
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Supplemental Notes:
- © 2018 Informa UK Limited, trading as Taylor & Francis Group. Abstract republished with permission of Taylor & Francis.
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Authors:
- Xing, Kai
- Zhou, Zhong
- Yang, Hao
- Liu, Baochen
- Publication Date: 2020-1
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 9-19
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Serial:
- International Journal of Pavement Engineering
- Volume: 21
- Issue Number: 1
- Publisher: Taylor & Francis
- ISSN: 1029-8436
- Serial URL: http://www.tandf.co.uk/journals/titles/10298436.html
Subject/Index Terms
- TRT Terms: Freeze thaw tests; Modulus of elasticity; Rocks; Shear strength; Soils; Subgrade (Pavements); Triaxial shear tests
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01723525
- Record Type: Publication
- Files: TRIS
- Created Date: Nov 23 2019 12:55PM