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Permeability anisotropy development in sintering pyroclasts under differential stress

Urheber*innen

Lamur,  Anthony
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kendrick,  Jackie E.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Schunke,  Julia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Vasseur,  Jérémie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wadsworth,  Fabian B.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lavallée,  Yan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Lamur, A., Kendrick, J. E., Schunke, J., Vasseur, J., Wadsworth, F. B., Lavallée, Y. (2023): Permeability anisotropy development in sintering pyroclasts under differential stress, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4101


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021541
Zusammenfassung
In magmas, the sintering of pyroclasts controls the geometry of permeable pathways, which can in turn influence the cyclicity of pressure build-up and release. The kinetics and timescales of sintering, along with its impact on permeability, have been well studied at both iso- and non-isothermal conditions and show that surface tension is the main process driver, leading to a reduction in both porosity and permeability. On the other hand, fewer studies have looked at the effect of differential load on the sintering process and the resultant micro-structural arrangements. Here, we investigate whether uniaxial loading can enhance pore connectivity perpendicular to the applied principal load. We put a suite of sintered glass bead samples (pre-sintered to 20-30% porosity) of 25 mm height and 25 mm diameter under different uniaxial loads (every 10N between 30-100N) and at the same sintering temperature (660oC furnace temperature). We then reconstruct the geometry of the porous network using X-ray computed tomography scans of the deformed samples before modelling the fluid flow and permeabilities in directions parallel and perpendicular to the applied stress. Thus, revealing how permeability anisotropy may develop under differential stress conditions.