Temperature Induced Fracturing of Rock Salt Mass

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Staudtmeister, K.; Zapf, D.; Leuger, B.; Elend, M.: Temperature Induced Fracturing of Rock Salt Mass. In: Procedia Engineering 191 (2017), S. 967-974. DOI: https://doi.org/10.1016/j.proeng.2017.05.268

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During the operation of gas storage caverns in rock salt mass the internal pressure changes during filling and withdrawal phases. Additionally temperature variations occur versus operation time. During withdrawal phases the temperature decreases which can lead to stress states in tensile regions at the cavern wall. Because the tensile strength of rock salt is relatively low compared to its compressive strength it is likely that tensile stresses lead to discrete fractures orthogonal to the direction of the tensile stresses. If fractures of this kind are created – whether vertical or horizontal – the gas will penetrate into the fracture at the relevant pressure and further extend the length of the fractures under certain circumstances. There are currently no theoretical approaches describing the manner in which the fractures might propagate into the not by temperature changes influenced rock salt mass during repeated cyclic pressure changes. This aspect is topic of prospective research. Salt caverns cannot be entered but only explored by sonar measurements, with which it is not possible to detect tensile fractures at the cavern wall. Within this paper examples from mining configurations will be shown where temperature changes lead to tensile fractures in the surrounding rock salt. These fractures have been well mapped while the temperature development is well documented. The paper deals with recalculations under consideration of different salt properties of the temperature distributions and the resulting stress state in the surrounding rock salt mass. The stress calculation results and the consequences for the dimensioning of natural gas caverns are going to be discussed and assessed.
License of this version: CC BY-NC-ND 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2017
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie

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pos. country downloads
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1 image of flag of Germany Germany 88 80.00%
2 image of flag of United States United States 10 9.09%
3 image of flag of Latvia Latvia 2 1.82%
4 image of flag of China China 2 1.82%
5 image of flag of No geo information available No geo information available 1 0.91%
6 image of flag of Netherlands Netherlands 1 0.91%
7 image of flag of India India 1 0.91%
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10 image of flag of Canada Canada 1 0.91%
    other countries 2 1.82%

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