A New Method for Determination of the Final Swelling Strain of Sand-Bentonite Mixtures

Q: What does this research mean for the field?

The proposed 'divided continuous method' provides a reliable calculation of the final swelling strain of sand-bentonite mixtures that is less dependent on the approximation interval, and the appropriate end point for swelling experiments can be estimated based on bentonite dry density. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Yu KOBASHI; Chiharu Urano; Hailong Wang; Daichi Ito; Hideo Komine

doi:10.3208/jgs.21.337

August 31, 2026Japanese Geotechnical JournalOpen Access

A New Method for Determination of the Final Swelling Strain of Sand-Bentonite Mixtures

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Key Points

To systematically evaluate the interval dependency of hyperbolic approximation in swelling strain calculations and develop an accurate method for estimating the final swelling strain and test completion time.
Analyzed one-dimensional swelling deformation test data of sand-bentonite mixtures under a low vertical stress condition of 19.6 kPa.
Assessed how varying the fitting intervals in hyperbolic approximation affects final swelling strain estimations.
Formulated a segmented continuous method and an estimation framework for test termination based on bentonite dry density.
Hyperbolic approximation exhibited significant dependency on the chosen calculation interval during long-term swelling convergence.
The proposed segmented continuous method mitigated approximation interval sensitivity to determine final swelling strain reliably.
Bentonite dry density provided an effective basis to systematically predict the required experimental duration for swelling deformation convergence.

Implication

Experimental modeling demonstrates a segmented continuous method to calculate final swelling strain in sand-bentonite mixtures, indicating a reliable standard for test duration.

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Cite This Study

KOBASHI et al. (2026) studied this question.

synapsesocial.com/papers/6a9934cf636c6408cfa7c86f https://doi.org/10.3208/jgs.21.337

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A New Method for Determination of the Final Swelling Strain of Sand-Bentonite Mixtures

Key Points

Implication

Abstract

Discussion

Cite This Study

A New Method for Determination of the Final Swelling Strain of Sand-Bentonite Mixtures

Key Points

Implication

Abstract

Discussion

Cite This Study

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