Gas transport properties of rock salt—synoptic view

Popp, T.; Minkley, W.; Schulze, K.

doi:10.1201/b12041-22

Cited by 4 publications

(5 citation statements)

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“…(9), when ρ=ρ salt the elastic moduli are those of the natural salt. However, it is important to highlight that experimental data sets at realistic load conditions do not cover the porosity range below 5-10 % (DBE, 2001;Kröhn et al, 2012). Therefore, some uncertainties exist about the accuracy of the cwipp model in that range.…”

Section: Thermal Hydraulic and Mechanical Characteristics Of The Crumentioning

confidence: 99%

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Long-term modeling of the thermal–hydraulic–mechanical response of a generic salt repository for heat-generating nuclear waste

Martin

Rutqvist

Birkhölzer

2015

Engineering Geology

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A modelling effort has been undertaken to investigate the long-term response of a generic salt repository for heat-generating nuclear waste, including processes that could affect the geological (natural salt host rock) and geotechnical (backfill) barriers. For this purpose, the TOUGH-FLAC sequential simulator for coupled thermal-hydraulic-mechanical processes modelling has recently been provided with a capability for large strains and creep. The responses of the saliferous host rock and the crushed salt backfill are modelled using dedicated constitutive relationships. Similarly, the coupling between the geomechanics and the flow subproblems is performed on the basis of theoretical and experimental studies. The repository investigated in this work considers in-drift emplacement of the waste packages and subsequent backfill of the drifts with run-of-mine salt. Using the updated TOUGH-FLAC, the compaction of the backfill and the evolution of its properties as porosity decreases can be modelled. Additionally, different processes that may influence the initial tightness of the host rock can be investigated. On the basis of state-of-the-art phenomenological models, our simulation results show that, in order to evaluate the barriers integrity, it is necessary to consider full coupling between thermal, hydraulic and mechanical processes. A base case scenario that accounts for these coupled processes is presented and compared to a case in which the mechanical processes are disregarded. Also, we investigate the sensitivity of the coupled numerical predictions to two factors: the initial saturation within the host rock and the capillary forces. Although the outcome of these simulations is preliminary and will be improved as the understanding of relevant salt processes moves forward, the numerical tools required to perform the target predictions have been significantly improved.

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Section: Thermal Hydraulic and Mechanical Characteristics Of The Crumentioning

confidence: 99%

“…On the other hand, the reconsolidation process at the high temperatures associated with exothermic nuclear waste would benefit from further investigation (Carter et al, 2011a). Moreover, the compaction behavior at porosities lower than 5-10 % is not currently well understood, and data in this range are scarce (Kröhn et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Long-term modeling of the thermal–hydraulic–mechanical response of a generic salt repository for heat-generating nuclear waste

Martin

Rutqvist

Birkhölzer

2015

Engineering Geology

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“…In the work addressed here porosities' effects were excluded as within the first 10 m of burial cementation reduces the porosity of halite crusts to less than 10% [59], [60]. The pore spaces in rock salt are almost completely filled at burial depths of 200 m [61], [62]. In addition, low levels of porosity do not influence the propagation of wavelength at meter orders (corresponding to the 170 MHz) [18].…”

Section: Appendix Characteristics Of the Salt Diapirmentioning

confidence: 99%

A Large Scale Characterization of the Dielectric Properties of Heterogeneous Layered Rock Salt

Badescu

2020

IEEE Trans. Geosci. Remote Sensing

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Although there are several methods described in the literature to accurately measure the complex permittivity of solid dielectrics at radio frequencies in a laboratory environment, none of these methods allow for a large-scale accurate characterization of natural ionic dielectrics. The work presented here reports results of the dielectric permittivity retrieved from in situ measurements in a Romanian salt mine. Measurements were performed in the 164-174-MHz bandwidth, over a propagation distance of 100 m. The characteristics of the layers of sedimentary salt are determined from measurements using a least mean square fitting algorithm, based on a detailed propagation model for a heterogeneous medium. The coupling of the instrumentation is also considered. The proposed approach demonstrates great promise for a large number of applications.

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“…As it will be discussed later, the evolution of some of these properties is currently well understood; however, the reconsolidation process at the high temperatures associated with heat-generating nuclear waste, as well as the effect of the moisture content on the compaction rate are currently under investigation [34,39]. Moreover, there are still some uncertainties about the remaining permeability and porosity of highly compacted crushed salt, as only a few experimental results are available [40].…”

Section: Introductionmentioning

confidence: 99%

Comparison of two simulators to investigate thermal–hydraulic–mechanical processes related to nuclear waste isolation in saliferous formations

Martin

Wolters

Rutqvist

et al. 2015

Computers and Geotechnics

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a b s t r a c tWe investigate the capabilities of two simulators, TOUGH-FLAC and FLAC-TOUGH, to predict the longterm thermal-hydraulic-mechanical response of a generic salt repository for heat-generating nuclear waste. These simulators are based on sequential coupling and include state-of-the-art knowledge for saliferous materials. Their main difference is the sequential method used. We present a benchmark between LBNL and TU Clausthal. The scenario studied assumes heat and gas generation from the waste packages, and crushed salt backfill. The comparison of results is very satisfactory, providing increased reliability and confidence in the capabilities of the simulators to evaluate the geological and engineered barriers in the long-term.Published by Elsevier Ltd.

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Gas transport properties of rock salt—synoptic view

Cited by 4 publications

References 0 publications

Long-term modeling of the thermal–hydraulic–mechanical response of a generic salt repository for heat-generating nuclear waste

Long-term modeling of the thermal–hydraulic–mechanical response of a generic salt repository for heat-generating nuclear waste

A Large Scale Characterization of the Dielectric Properties of Heterogeneous Layered Rock Salt

Comparison of two simulators to investigate thermal–hydraulic–mechanical processes related to nuclear waste isolation in saliferous formations

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