Abstract
The stiffness of destructured chalk, a silt-sized soft biomicrite, has been investigated using undrained triaxial tests equipped with bender elements (BE). The effects of potential fabric anisotropy on the BE-measured vertical small strain shear modulus (Gv0) has been assessed by testing remoulded material produced from parent chalks of different characteristics, and by reconstituting specimens at different moisture contents. The role of stress-induced anisotropy has been evaluated by consolidating specimens in either isotropic or one-dimensional conditions. Results revealed that the mean effective stress (p′) is the dominant parameter affecting Gv0, potentially due to the limited role of grain rearrangement and breakage during first-loading compression of fine-sized granular materials. Moderate effects on Gv0 were associated with inherent and induced anisotropy. At larger strains, stiffness degradation was found to be markedly non-linear, and degradation rates were most affected by the state of the material.
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- 1.
The term ‘involuntary’ is here used to differentiate from, for example, the deliberate crushing of weak rock to use as fill.
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Acknowledgments
This research has been co-sponsored by the National Council of Science and Technology (CONACyT) and the Education Secretariat (SEP) of Mexico, and by the Faculty of Engineering and the Environment of the University of Southampton. Authors are grateful for the suggestions and comments of Prof C.R.I. Clayton.
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Alvarez-Borges, F.J., Madhusudhan, B.N., Richards, D.J. (2018). Stiffness of Destructured Weak Carbonate Rock. In: Giovine, P., Mariano, P., Mortara, G. (eds) Micro to MACRO Mathematical Modelling in Soil Mechanics. Trends in Mathematics. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-99474-1_1
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