Details
| Original language | English |
|---|---|
| Pages (from-to) | 967-974 |
| Number of pages | 8 |
| Journal | Procedia Engineering |
| Volume | 191 |
| Publication status | E-pub ahead of print - 21 Jun 2017 |
| Event | ISRM European Rock Mechanics Symposium, EUROCK 2017 - Ostrava, Czech Republic Duration: 20 Jun 2017 → 22 Jun 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.
Keywords
- fracture propagation, gas storage, Rock mechanics, rock salt
ASJC Scopus subject areas
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In: Procedia Engineering, Vol. 191, 21.06.2017, p. 967-974.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Temperature Induced Fracturing of Rock Salt Mass
AU - Staudtmeister, Kurt
AU - Zapf, Dirk
AU - Leuger, Bastian
AU - Elend, Marc
PY - 2017/6/21
Y1 - 2017/6/21
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.
AB - 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.
KW - fracture propagation
KW - gas storage
KW - Rock mechanics
KW - rock salt
UR - http://www.scopus.com/inward/record.url?scp=85022187333&partnerID=8YFLogxK
U2 - 10.1016/j.proeng.2017.05.268
DO - 10.1016/j.proeng.2017.05.268
M3 - Conference article
AN - SCOPUS:85022187333
VL - 191
SP - 967
EP - 974
JO - Procedia Engineering
JF - Procedia Engineering
SN - 1877-7058
T2 - ISRM European Rock Mechanics Symposium, EUROCK 2017
Y2 - 20 June 2017 through 22 June 2017
ER -