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01-07-2024 | Original Paper

Effect of electrolysis desaturation treatment on micro-structure of liquefiable silica sands

Authors: Runze Chen, Yuxia Hu, Yumin Chen, Ying Zhou

Published in: Bulletin of Engineering Geology and the Environment | Issue 7/2024

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Abstract

Electrolysis desaturation is an emerging ground improvement technique with significant potential for widespread application in liquefaction mitigation. This method reduces the saturation of foundation soils, thereby decreasing soil liquefaction potential during earthquake. To date, there is still a lack of systematic research on the microstructure evolution of silica sands during the electrolysis desaturation treatment. In this study, non-destructive low-field nuclear magnetic resonance (NMR) technology was employed to investigate the effects of electrolysis desaturation on the silica sands at the microscale. The results showed that the electrolysis desaturation treatment had negligible effects on the structures of micropores and mesopores. The macropores in fine sand expanded during electrolysis, and the increasing current amplified the extent of this expansion. Conversely, in coarse sand, the macropores contracted during electrolysis. Bubbles generated by high-current electrolysis tend to aggregate, causing cracks and surface uplift in the fine silica sand. For the coarse silica sand, the generated gas accumulates within the existing voids, resulting in an insignificant impact on the soil structure. The electrolysis desaturation treatment primarily facilitated the expulsion of free water in both fine and coarse silica sands. In fine silica sand, employing a high current can reduce saturation more effectively within the same duration, but it also allows for more gas bubbles to escape after resting. Coarse silica sand maintained a high desaturation efficiency due to its greater porosity. This study provides a rational explanation in microscale of the structural impacts of electrolysis desaturation treatment on foundation soils.

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Literature
go back to reference Seed RB, Cetin KO (2003) RESMAMKJWJMPMFRRBSJDBREKAF Recent Advances in Soil Liquefaction Engineering: a Unified and Consistent Framework. In: Report no.EERC 2003-06, Earthquake Engineering Research Center. pp 1–72 Seed RB, Cetin KO (2003) RESMAMKJWJMPMFRRBSJDBREKAF Recent Advances in Soil Liquefaction Engineering: a Unified and Consistent Framework. In: Report no.EERC 2003-06, Earthquake Engineering Research Center. pp 1–72
go back to reference Yegian MK, Eseller E, Alshawabkeh A (2006) Preparation and cyclic testing of partially saturated Sands. Unsaturated soils 2006. American Society of Civil Engineers, Reston, VA, pp 508–518CrossRef Yegian MK, Eseller E, Alshawabkeh A (2006) Preparation and cyclic testing of partially saturated Sands. Unsaturated soils 2006. American Society of Civil Engineers, Reston, VA, pp 508–518CrossRef
Metadata
Title
Effect of electrolysis desaturation treatment on micro-structure of liquefiable silica sands
Authors
Runze Chen
Yuxia Hu
Yumin Chen
Ying Zhou
Publication date
01-07-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 7/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03784-w

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