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Effect of pillar width on the stability of the salt cavern field for energy storage

Katarzyna Cyran
Katarzyna Cyran
 e 
Michal Kowalski
Michal Kowalski
   | 20 giu 2024
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Article Category: Research Article
Pubblicato online: 20 giu 2024
Pagine: -
Ricevuto: 31 ott 2023
Accettato: 15 mag 2024
DOI: https://doi.org/10.2478/sgem-2024-0009
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© 2024 Katarzyna Cyran et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1:

Shape and dimensions of caverns used in numerical simulations.
Shape and dimensions of caverns used in numerical simulations.

Figure 2:

The layout of the cavern field:1, 2, 3 – ring number, pillar width in variant 1 – 80.0 m, variant 2 – 160.0 m, and variant 3 – 240.0 m.
The layout of the cavern field:1, 2, 3 – ring number, pillar width in variant 1 – 80.0 m, variant 2 – 160.0 m, and variant 3 – 240.0 m.

Figure 3:

The numerical model of the cavern field based on the geological structure of the Mechelinki salt deposit.
The numerical model of the cavern field based on the geological structure of the Mechelinki salt deposit.

Figure 4:

Total displacements in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of total displacements were marked by the purple circle.
Total displacements in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of total displacements were marked by the purple circle.

Figure 5:

Vertical displacements in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of vertical displacements were marked by the purple circle.
Vertical displacements in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of vertical displacements were marked by the purple circle.

Figure 6:

Horizontal displacements in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of horizontal displacements were marked by the purple circle.
Horizontal displacements in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of horizontal displacements were marked by the purple circle.

Figure 7:

Von Mises stress in the pillars and contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of von Mises stress were marked by purple circle.
Von Mises stress in the pillars and contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The largest values of von Mises stress were marked by purple circle.

Figure 8:

Von Mises stress in the pillars and contour zone around the salt caverns for different pillar widths at the end and beginning of the last withdrawal period, a cross-section through ring no. 3. The largest values of von Mises stress were marked by the purple circle.
Von Mises stress in the pillars and contour zone around the salt caverns for different pillar widths at the end and beginning of the last withdrawal period, a cross-section through ring no. 3. The largest values of von Mises stress were marked by the purple circle.

Figure 9:

SSR in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The lowest values of SSR were marked by the purple circle.
SSR in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the end of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The lowest values of SSR were marked by the purple circle.

Figure 10:

SF in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the beginning of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The lowers values of SF were marked by the purple circle.
SF in the pillars and the contour zone around the salt caverns for different pillar widths and cavern fields at the beginning of the last withdrawal period. The variants of cavern layouts are presented in rows, while the variants of pillar width are presented in columns. The lowers values of SF were marked by the purple circle.

Figure 11:

Convergence in the cavern fields for different pillar widths (D1, D2, D3) at the end of the last withdrawal.
Convergence in the cavern fields for different pillar widths (D1, D2, D3) at the end of the last withdrawal.

Mechanical parameters applied in the geomechanical analysis.

Parameters Anhydrite Rock Salt Rock Mass Soil
Bulk density (kg/m3) 2,400 2,400 2,400 2,000
Young's modulus (MPa) 12,000 5,000 10,000 100
Poisson's ratio (−) 0.20 0.45 0.25 0.25
Cohesion (kPa) 4,000 10,990 5,000 1
Internal friction angle (°) 35 36.4 40 25
Tensile strength (kPa) 1,000 2,000 2,000 1
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