Deformation characteristics and mechanism of dispersive soil under freeze–thaw cycles

As a special soil, dispersive soil is widely distributed all over the world, especially in Northeast China. The freeze–thaw (F-T) cycles of dispersive soil cause considerable damage to water conservancy projects and highway projects. In this study, according to the F-T cycles of unsaturated dispersi...

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Veröffentlicht in:Arabian journal of geosciences 2022, Vol.15 (10), Article 981
Hauptverfasser: Wang, Lixiang, Song, Xinjiang, Huang, Ming
Format: Artikel
Sprache:eng
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Zusammenfassung:As a special soil, dispersive soil is widely distributed all over the world, especially in Northeast China. The freeze–thaw (F-T) cycles of dispersive soil cause considerable damage to water conservancy projects and highway projects. In this study, according to the F-T cycles of unsaturated dispersive soil, the deformation characteristics of the dispersive soil were explored. The F-T cycle deformation characteristics of dispersive soil and non-dispersive soil were compared. The results showed that the F-T cycle deformation of dispersive soil was obviously different from that of non-dispersive soil. The dispersive soil showed a strong frost heave, and its frost heave was considerably greater than that of non-dispersive soil. Sodium ions were the main reason for the differences in F-T cycle deformation between dispersive and non-dispersive soils. Under the action of the F-T cycles, the pores of the dispersive soil became larger and a large number of cracks appeared, which was more conducive to water migration. The F-T cycle deformation of non-dispersive soil was mainly attributed to the ice lens, compared with in situ frost heave in the dispersive soil. There was no apparent generation of a segregated ice lens for dispersive soil during the F-T cycles. This was the fundamental difference in the F-T cycle mechanism between the dispersive and non-dispersive soils.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-10212-4