Abstract
Abandoned underground mines appear to be very sensitive to the variations in their environment. Due to seasonal environmental changes often related to climate and resulting in changes in the water table and hygrometry, the pillars are often subjected to cyclic variations of saturation. This could affect the short- and long-term stability of these abandoned structures. In this paper, a preliminary study on the behaviour of Château-Landon chalk has been carried out. Samples were extracted from pillars of the abandoned Royer chalk mine (Château-Landon, France). The mechanical behaviour of this chalk was then investigated by performing conventional hydrostatic, triaxial compression, and creep tests under drained conditions at different water saturation degrees and confining pressures. The obtained results show up fundamental aspects of this chalk behaviour. Its high sensitivity to water and confining pressure are described, and a water saturation-induced plastic deformation is analysed. The results presented in this paper provide some key mechanisms that can be used in the framework of back analysis and expertise in underground chalk mines, as well as the data required for the development of a specific constitutive model.
Highlights
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Compression tests were performed on the Château-Landon chalk at different water saturation degrees (10%, 40%, 60%, 90%, 100%) and confining pressures (0.5, 1, 1.5, 2, 3 Mpa).
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An analysis of the creep behaviour of this material at a partial and total saturated state was shown.
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The variation of mechanical properties with water saturation degree and confining pressure was analysed.
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Data Availability
The data supporting the findings of this study will be made available in future work (that is currently being writing). Access to these data will be provided upon publication of the subsequent study.
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Acknowledgements
Danielle Pajiep thanks Yu-Hao Zhang, a doctoral student at LaMcube, for his valuable help in the realization of laboratory tests.
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Pajiep, D., Conil, N., Souley, M. et al. Experimental Investigation of Saturation Effect on the Mechanical Behaviour of Château-Landon Chalk. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03833-6
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DOI: https://doi.org/10.1007/s00603-024-03833-6