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Stress Estimation through Deep Rock Core Diametrical Deformation and Joint Roughness Assessment Using X-ray CT
Hanna Kim1, Melvin B Diaz2, Joo Yeon Kim2
1Korea Institute of Geoscience and Mineral Resources, 124, Gwahak-ro Yuseong-gu, Daejeon 34132, Korea.
This study estimated in-situ stress using diametrical core deformation analysis on a deep geothermal rock core. Results show a horizontal stress difference and suggest joint roughness anisotropy can indicate stress orientation.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Geophysics
Background:
- In-situ stress estimation is critical for underground projects.
- No single method is error-free, necessitating combined approaches.
- Deep geothermal projects require accurate stress assessments.
Purpose of the Study:
- To assess in-situ stresses for a geothermal project at 4.2 km depth.
- To evaluate the diametrical core deformation analysis (DCDA) method.
- To explore the relationship between stress orientation and joint roughness.
Main Methods:
- Analysis of a deep granodiorite rock core (100 mm diameter).
- Application of the diametrical core deformation analysis (DCDA) method.
- Industrial X-ray computed tomography (CT) for diametrical deformation measurement.
Main Results:
- Average horizontal stress difference of 13.3 MPa was determined.
- Results align with data from a nearby exploration well.
- Correlation found between maximum horizontal stress and minimum joint roughness coefficient orientation.
Conclusions:
- The DCDA method provides reliable in-situ stress estimations.
- Joint roughness anisotropy may serve as an indicator for stress orientation.
- Further research can refine stress tracking using geological features.
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