On the thermo-hydro-mechanical behaviour of Argillaceous hard soils - weak rocks

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Authors

Saeed Tourchi 

Abstract

Analysis and interpretation of the thermo-hydro-mechanical (THM) behaviour of argillaceous rocks is still among the most challenging of problems in geomechanical engineering. The comprehensive review of this wide variety of this class of materials has shown how different geotechnical parameters play various roles in the assessment of deep geological repository of high- and intermediate-level long-lived radioactive waste. After considering the wide variety of this class of materials, some common behaviour features are sought concerning compressibility, structure development, brittleness and progressive failure, anisotropy, effects of discontinuities, hydraulic properties. A comprehensive literature review on laboratory experimental results of the temperature effect on thermal, hydrolic and mechanical behaviour of argillaceous rocks is also caried out. Those features are examined in the context of appropriate behaviour frameworks developed for this type of materials. Two themes are then selected for special consideration: brittleness and progressive failure and the response of argillaceous weak rocks to deep underground excavations and in situ heating tests. For the second topic, particular attention is given to field results obtained in deep underground laboratories for nuclear waste disposal. The paper concludes with a summary of the main points.

DOI

https://doi.org/10.31223/X5507M

Subjects

Engineering

Keywords

clays, argillites, compressibility, swelling, anisotropy, discontinuities, Permeability, hydromechanical coupling, strength, brittleness, progressive failure, underground excavations in situ testing; radioactive waste; temperature effects; Coupled THM processes

Dates

Published: 2023-01-31 15:49

Last Updated: 2023-01-31 15:49

License

CC-BY Attribution-NonCommercial 4.0 International