Characterizing Excavation Damaged Zone and Stability of Pressurized Lined Rock Caverns for Underground Compressed Air Energy Storage
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- 作者：Hyung-Mok Kim (1)
Jonny Rutqvist (2)
Ju-Hwan Jeong (3)
Byung-Hee Choi (4)
Dong-Woo Ryu (4)
Won-Kyong Song (4) - 关键词：Excavation damaged zone (EDZ) ; Compliance ; Lined rock cavern (LRC) ; Compressed air energy storage (CAES) ; TOUGH ; FLAC simulator
- 刊名：Rock Mechanics and Rock Engineering
- 出版年：2013
- 出版时间：September 2013
- 年：2013
- 卷：46
- 期：5
- 页码：1113-1124
- 全文大小：1386KB
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Jonny Rutqvist (2)
Ju-Hwan Jeong (3)
Byung-Hee Choi (4)
Dong-Woo Ryu (4)
Won-Kyong Song (4)
1. Energy and Mineral Resources Engineering, Sejong University, Seoul, 143-747, Korea
2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA, 94720, USA
3. South Mine Security Office, Ministry of Knowledge Economy, Hwasun, 519-805, Korea
4. Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 305-350, Korea - ISSN：1434-453X
文摘
In this paper, we investigate the influence of the excavation damaged zone (EDZ) on the geomechanical performance of compressed air energy storage (CAES) in lined rock caverns. We conducted a detailed characterization of the EDZ in rock caverns that have been excavated for a Korean pilot test program on CAES in (concrete) lined rock caverns at shallow depth. The EDZ was 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 to be 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.