Temperature Induced Fracturing of Rock Salt Mass

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

Autoren

  • Kurt Staudtmeister
  • Dirk Zapf
  • Bastian Leuger
  • Marc Elend

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Details

OriginalspracheEnglisch
Seiten (von - bis)967-974
Seitenumfang8
FachzeitschriftProcedia Engineering
Jahrgang191
Frühes Online-Datum21 Juni 2017
PublikationsstatusVeröffentlicht - 2017
VeranstaltungISRM European Rock Mechanics Symposium, EUROCK 2017 - Ostrava, Tschechische Republik
Dauer: 20 Juni 201722 Juni 2017

Abstract

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.

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Temperature Induced Fracturing of Rock Salt Mass. / Staudtmeister, Kurt; Zapf, Dirk; Leuger, Bastian et al.
in: Procedia Engineering, Jahrgang 191, 2017, S. 967-974.

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

Staudtmeister, K, Zapf, D, Leuger, B & Elend, M 2017, 'Temperature Induced Fracturing of Rock Salt Mass', Procedia Engineering, Jg. 191, S. 967-974. https://doi.org/10.1016/j.proeng.2017.05.268
Staudtmeister, K., Zapf, D., Leuger, B., & Elend, M. (2017). Temperature Induced Fracturing of Rock Salt Mass. Procedia Engineering, 191, 967-974. https://doi.org/10.1016/j.proeng.2017.05.268
Staudtmeister K, Zapf D, Leuger B, Elend M. Temperature Induced Fracturing of Rock Salt Mass. Procedia Engineering. 2017;191:967-974. Epub 2017 Jun 21. doi: 10.1016/j.proeng.2017.05.268
Staudtmeister, Kurt ; Zapf, Dirk ; Leuger, Bastian et al. / Temperature Induced Fracturing of Rock Salt Mass. in: Procedia Engineering. 2017 ; Jahrgang 191. S. 967-974.
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AU - Staudtmeister, Kurt

AU - Zapf, Dirk

AU - Leuger, Bastian

AU - Elend, Marc

PY - 2017

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N2 - 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.

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