Modeling of coupled thermodynamic and geomechanical performance of underground compressed air energy storage in lined rock caverns

Rutqvist, Jonny; Kim, Hyung-Mok; Ryu, Dong-Woo; Synn, Joong-Ho; Song, Wonkyong

doi:10.1016/j.ijrmms.2012.02.010

Cited by 132 publications

(30 citation statements)

References 12 publications

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“…For this modeling effort, we used TOUGH-FLAC coupled analysis (Rutqvist, 2011), following a modeling approach and setup recently used by Kim et al (2012) and Rutqvist et al (2012) on an equivalent CAES system. The principles of TOUGH-FLAC coupled analysis are shown in Figure 8.…”

Section: Numerical Evaluation Of Edz Influence On Geomechanical Stabimentioning

confidence: 99%

“…Model geometry and grid were similar to that used in Kim et al (2012) and Rutqvist et al, (2012), except for EDZ thickness and properties, which have since been updated based on investigation at the pilot test cavern ( Figure 9). It is a 2D model domain, corresponding to a 1 m thick vertical cross-section through the storage cavern, with a radius of 2.5 m, and with thicknesses for the concrete lining and EDZ of 0.5 and 0.6 m, respectively.…”

Section: Analysis Conditionsmentioning

confidence: 99%

“…Moreover, Rutqvist et al (2012), studying coupled geomechanical and thermodynamic processes in underground CAES caverns for a similar kind of system, found that tensile stresses would develop in the concrete lining, but such stresses could be reduced when using an air tight inner seal (such as a rubber or steel liner) that would not allow pressurized air in the cavern to penetrate into the lining.…”

Section: Introductionmentioning

confidence: 99%

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Characterizing Excavation Damaged Zone and Stability of Pressurized Lined Rock Caverns for Underground Compressed Air Energy Storage

Kim

Rutqvist

Jeong³

et al. 2012

Rock Mech Rock Eng

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TitleCharacterizing excavation damaged zone and stability of pressurized lined rock caverns for underground compressed air energy storage characterized by measurements of P-and S-wave velocities and permeability across the EDZ and into undisturbed host rock. Moreover, we constructed an in situ concrete-lining model and conducted permeability measurements in boreholes penetrating the concrete, through the EDZ and into the undisturbed host rock. Using the site-specific conditions and, the results of the EDZ characterization, we carried out a model simulation to investigate the influence of the EDZ on the CAES performance, in particular related to geomechanical responses and stability. We used a modeling approach including coupled thermodynamic multiphase flow and geomechanics, which was proven useful in previous generic CAES studies. Our modeling results showed that the potential for inducing tensile fractures and air leakage through the concrete lining could be substantially reduced if the EDZ around the cavern could be minimized. Moreover, the results showed that the most favorable design for reducing the potential for tensile failure in the lining would be a relatively compliant concrete lining with a tight inner seal, and a relatively stiff (uncompliant) host rock with a minimized EDZ. Because EDZ compliance depends on its compressibility (or modulus) and thickness, care should be taken during drill and blast operations to minimize the damage to the cavern walls.

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Section: Numerical Evaluation Of Edz Influence On Geomechanical Stabimentioning

confidence: 99%

Section: Analysis Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterizing Excavation Damaged Zone and Stability of Pressurized Lined Rock Caverns for Underground Compressed Air Energy Storage

Kim

Rutqvist

Jeong³

et al. 2012

Rock Mech Rock Eng

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“…The excavated cavern could be located at a shallower depth if the unstable ground conditions after excavation can be stabilized through various support systems and injected air can be perfectly stored inside the lining. Indeed, the improvement around the cavern significantly reduces the additional cost and provides benefits of selecting the potential sites [6,7].…”

Section: Introductionmentioning

confidence: 99%

Development of a Numerical Approach to Simulate Compressed Air Energy Storage Subjected to Cyclic Internal Pressure

Chong¹

2017

Energies

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This paper analyzes the long-term response of unlined energy storage located at shallow depth to improve the distance between a wind farm and storage. The numerical approach follows the hybrid scheme that combined a mechanical constitutive model to extract stress and strains at the first cycle and polynomial-type strain accumulation functions to track the progressive plastic deformation. In particular, the strain function includes the fundamental features that requires simulating the long-term response of geomaterials: volumetric strain (terminal void ratio) and shear strain (shakedown and ratcheting), the strain accumulation rate, and stress obliquity. The model is tested with a triaxial strain boundary condition under different stress obliquities. The unlined storage subjected to cyclic internal stress is simulated with different storage geometries and stress amplitudes that play a crucial role in estimating the long-term mechanical stability of underground storage. The simulations present the evolution of ground surface, yet their incremental rate approaches towards a terminal void ratio. With regular and smooth displacement fields for the large number of cycles, the inflection point is estimated with the previous surface settlement model.

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“…Underground storage in unlined caverns has numerous advantages over aboveground storage (Morfeldt, 1974;Bergman, 1984;Broms and Zhao, 1993;Zhao et al, 1996Zhao et al, , 1999Zhao et al, , 2004Sun and Zhao, 2010;Rutqvist et al, 2012), for instance, larger storage capacity, longer service life, and less resource consumption. Meanwhile, the underground storage is safe from extreme conditions such as fire, earthquake and explosion.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of underground oil storage caverns by an integrated numerical and microseismic monitoring approach

Tang

Wang

et al. 2016

Tunnelling and Underground Space Technology

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a b s t r a c tUnderground storage in unlined caverns is of great significance for storing energy resources. Construction of underground storage caverns is an extremely complex process, involving extensive multi-bench excavation and strong unloading. Excavation-induced damage of surrounding rock masses may lead to instability of underground storage caverns. The aim of this paper is to put forward a method by integrating numerical simulation and microseismic monitoring for evaluation of cavern stability. A novel numerical method called Continuous-Discontinuous Element Method (CDEM) is applied to simulate micro-cracks under excavation-induced unloading conditions. Meanwhile, a microseismic (MS) monitoring system is employed to monitor real-time MS events during construction of storage caverns. Numerical results are validated using the monitoring data from the MS monitoring system. The integrated method is proved to be successful in capturing micro-cracks in underground storage caverns. Local instability, potential unstable zones and micro-crack evolution are analyzed, and cracking mechanisms are also discussed.

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Modeling of coupled thermodynamic and geomechanical performance of underground compressed air energy storage in lined rock caverns

Cited by 132 publications

References 12 publications

Characterizing Excavation Damaged Zone and Stability of Pressurized Lined Rock Caverns for Underground Compressed Air Energy Storage

Characterizing Excavation Damaged Zone and Stability of Pressurized Lined Rock Caverns for Underground Compressed Air Energy Storage

Development of a Numerical Approach to Simulate Compressed Air Energy Storage Subjected to Cyclic Internal Pressure

Stability analysis of underground oil storage caverns by an integrated numerical and microseismic monitoring approach

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