Discrete element modelling of conceptual deep geological repository for high-level nuclear waste disposal

Verma, A. K.; Gautam, Prabhat; Singh, T. N.; Bajpai, R.

doi:10.1007/s12517-014-1762-7

Cited by 23 publications

(4 citation statements)

References 18 publications

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“…The temperature of a coal fire, for example, is usually between 700 and 900 • C [6,7]. Moreover, temperatures can extend to 1000 • C during coal gasification procedures [8]. Fire damage to rocks is also relevant to various sectors, including geomorphology, cultural heritage, civil works, and engineering geology.…”

Section: Introductionmentioning

confidence: 99%

On the Physical and Mechanical Responses of Egyptian Granodiorite after High-Temperature Treatments

Gomah

Sun

et al. 2022

Sustainability

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In the design and stability of thermal engineering applications, a thorough understanding of the evolution of damage in the rock following high-temperature treatments is crucial. Hence, this study investigates the influence of high temperatures on Egyptian granodiorite rock properties, given its widespread use as ornamental stones and aggregate material for roadways. Temperature effects up to 800 °C on its physical and mechanical responses were examined in conjunction with microstructure alterations. The results show that the density of granodiorite decreases after heat exposure due to a gain in volume and a loss in mass, with volume expansion being the most important component. In addition, the uniaxial compressive strength increases up to 400 °C before reducing linearly as the temperature increases, while the elastic modulus and P-wave velocity show a reducing trend with the temperature. This study suggests that granodiorite has a thermal damage threshold of 400 °C, beyond which its microstructure and physical and mechanical characteristics deteriorate, and granodiorite becomes less brittle and more ductile. Hence, at the mutation range (between 400 and 600 °C), the physical and mechanical responses shift from a stable to an unstable state. As a result, the microstructure of the granodiorite samples was destroyed at 800 °C, resulting in a significant drop in compressive strength and dilemmas in measuring the P-wave and elastic modulus. Accordingly, the findings of this study can be used to aid in the safe handling of this rock in high-temperature conditions.

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Section: Introductionmentioning

confidence: 99%

On the Physical and Mechanical Responses of Egyptian Granodiorite after High-Temperature Treatments

Gomah

Sun

et al. 2022

Sustainability

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“…Development of hot dry rock (HDR) resources plays an important role in meeting the demand for energy [1][2][3][4][5]. Generally, the geothermal energy is mainly stored in a hot granite reservoir, which is distributed at the depth of 2-6 km with a temperature above 150 °C [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Mechanical and Permeability Evolution Effects of High-Temperature Granite Exposed to a Rapid Cooling Shock with Liquid Nitrogen

Wang

Xue

et al. 2021

Geofluids

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Liquid nitrogen (LN2), which can greatly improve the efficiency of hot dry rock (HDR) mining, is commonly used as a cooling material in the enhanced geothermal system (EGS). Physical property, triaxial compression, and permeability tests were undertaken on treated granite samples, for a better scientific understanding of the effect of the LN2 cooling method on the mechanical and permeability properties of the rocks after heat treatment. The experimental results indicated that the physical properties of the treated granite change significantly, such as the density and wave velocity are substantially reduced. Meanwhile, with the increase of treatment temperature, the macroscopic cracks on its surface are gradually generated and the volume is expanded clearly. In addition, the surface wettability of granite gradually increases with increasing temperature. Compared with the air/water cooling methods, under LN2 cooling condition, the mechanical properties decrease markedly. When the temperature exceeds 600°C, the granite strength decreases significantly to only 56.16% of the reference value. The deformation properties also change significantly, with a final strain of about 3% at failure for a sample at 800°C, showing an obvious ductile deformation characteristic. Further, an appreciable correlation also exists between the initial permeability of granite and temperature. Once the temperature exceeds 200°C, the increase in temperature contributes to the increase in initial permeability. In addition to the effect of temperature, the increase in load also leads to a change in the permeability coefficient. When the temperature reaches 600°C, the permeability of granite first decreases and then increases with the increases in axial stress. The results of this paper are valuable in understanding the effect of thermal shock by LN2 on the fracturing efficiency and permeability characteristics of dry hot rocks.

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“…Thus heat propagates mainly by conduction in a geologic repository. Several appropriate local-scale models are developed to investigate the heat transfer or thermo-mechanical interaction around the central canister [6][7][8][9][10][11][12][13][14][15][16]. Although multiple barriers consisting of the container, buff, backfill and rock can be considered, these local-scale models are only available for the symmetrical position at any time scale or asymmetrical region at short-term scale.…”

Section: Introductionmentioning

confidence: 99%

Thermoelastic analysis of a geological repository with distributed decay heat sources by the image method in combination with a numerical integration scheme

Liu

Xiang

2020

E3S Web Conf.

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The disposal of nuclear waste involves thermo-mechanical reaction of the host rock to the buried waste – a distributed heat source that decays. To solve the problem within the half infinite space confined by the ground surface, an image method is developed. Specifically, a negative image of the heat source with the ground surface as the mirror, i.e. a mirrored heat sink is utilized so that the normal traction generated by the heat source can be counterbalanced, and a numerical scheme of integration of the classical Cerruti solution is developed to include the effect of tangential shear traction on the ground surface caused by the heat sources and their mirrored sinks. For a conceptual repository model, large thermal shear stress, tensile stress, and deformation occur at the corner, between adjacent drifts, and at the boundary of the repository area, respectively. For a prescribed thermal loading, it is more efficient to mitigate the thermo-mechanical effects through enlarging the pit spacing than increasing the drift spacing.

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Discrete element modelling of conceptual deep geological repository for high-level nuclear waste disposal

Cited by 23 publications

References 18 publications

On the Physical and Mechanical Responses of Egyptian Granodiorite after High-Temperature Treatments

On the Physical and Mechanical Responses of Egyptian Granodiorite after High-Temperature Treatments

Investigation of the Mechanical and Permeability Evolution Effects of High-Temperature Granite Exposed to a Rapid Cooling Shock with Liquid Nitrogen

Thermoelastic analysis of a geological repository with distributed decay heat sources by the image method in combination with a numerical integration scheme

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