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Rock Mechanics and Rock Engineering

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07-10-2016 | Original Paper

Probabilistic Analysis of a Rock Salt Cavern with Application to Energy Storage Systems

Authors: Elham Mahmoudi, Kavan Khaledi, Shorash Miro, Diethard König, Tom Schanz

Published in: Rock Mechanics and Rock Engineering | Issue 1/2017

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Abstract

This study focuses on the failure probability of storing renewable energy in the form of hydrogen or compressed air in rock salt caverns. The validation of the short- and long-term integrity and stability of rock salt cavern is a prerequisite in their design process. The present paper provides a reliability-based analysis of a typical renewable energy storage cavern in rock salt. An elasto-viscoplastic creep constitutive model is implemented into a numerical model of rock salt cavern to assess its behavior under different operation conditions. Sensitivity measures of different variables involved in the mechanical response of cavern are computed by elementary effect global sensitivity method. Subset simulation methodology is conducted to measure the failure probability of the system with a low computational cost. This methodology is further validated by a comparison with a Monte Carlo-based probabilistic analysis. The propagation of parameter uncertainties and the failure probability against different failure criteria are evaluated by utilizing a Monte Carlo-based analysis. In this stage, the original finite element model is substituted by a surrogate model to further reduce the computational effort. Finally, a reliability analysis approach is employed to obtain the minimum admissible internal pressure in a cavern.

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Title: Probabilistic Analysis of a Rock Salt Cavern with Application to Energy Storage Systems
Authors: Elham Mahmoudi
Kavan Khaledi
Shorash Miro
Diethard König
Tom Schanz
Publication date: 07-10-2016
Publisher: Springer Vienna
Published in: Rock Mechanics and Rock Engineering / Issue 1/2017
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-016-1105-y

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