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Coupled thermo-hydro-mechanical analysis of a heater test in fractured rock and bentonite at Kamaishi Mine - comparison of field results to predictions of four finite element codes
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2001 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, Vol. 38, no 1, 129-142 p.Article in journal (Refereed) Published
Abstract [en]

Four computer codes were applied for a prediction of coupled thermo-hydro-mechanical responses during an in situ heater experiment which simulates a nuclear waste deposition hole with a waste over-pack and bentonite buffer, surrounded by fractured rock. The elevated temperature in the heater surroundings, which was maintained at 100 C for 8.5 months, generated substantial heat-driven moisture flow and swelling in the clay buffer, and thermal expansion of the surrounding fractured rock. Predicted system responses - including temperature. moisture content, fluid pressure, stress and displacement - were compared to measurements at 70 sensors located both in the clay buffer and the near-field rock. An overall good agreement between modeling and measured results indicates that most thermo-hydro-mechanical responses are fairly well represented by the coupled numerical models. Uncertainties occur for modeling of hydromechanical behavior of the swelling clay buffer at low saturation, modeling of near-field heterogeneous mechanical behavior of the low-stressed fractured reek, and modeling of the rock-buffer interface.

Place, publisher, year, edition, pages
2001. Vol. 38, no 1, 129-142 p.
URN: urn:nbn:se:kth:diva-20351ISI: 000166883800011OAI: diva2:339046
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Jing, Lanru
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Land and Water Resources Engineering
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