March 3, 2026

The back-analysis of shear modulus reduction with strain in weathered mudstone beneath an instrumented embankment

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Observational analysis shows shear modulus reduction with strain in weathered mudstone, implying improved design parameters for construction.

The shear modulus of the weathered mudstone increased linearly with depth, aligning with empirical equations observed during the experiment.
Measurements from extensometers indicated deformation and strains, allowing for accurate calculation of the in-situ shear modulus.
Back-analyses revealed comparisons with laboratory tests of fine-grained soils, highlighting consistency across different evaluation methods.
The observed reference strain values were lower than predicted by existing empirical equations, suggesting the need for further model refinement.

Briggs et al. (2025) studied this question.

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March 3, 2026

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Authors

Observational analysis shows shear modulus reduction with strain in weathered mudstone, implying improved design parameters for construction.

The shear modulus of the weathered mudstone increased linearly with depth, aligning with empirical equations observed during the experiment.
Measurements from extensometers indicated deformation and strains, allowing for accurate calculation of the in-situ shear modulus.
Back-analyses revealed comparisons with laboratory tests of fine-grained soils, highlighting consistency across different evaluation methods.
The observed reference strain values were lower than predicted by existing empirical equations, suggesting the need for further model refinement.