고준위방사성폐기물 처분부지 특성화를 위한 지체구조별 암종별 심부 시추 기반 균열 특성 연구
A Study on Fracture Characteristics based on Deep Boreholes by Tectonic Regimes and Rock Types for Characterization of High-Level Radioactive Waste Disposal Site
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
고준위방사성폐기물 처분부지의 균열 특성은 처분시설의 안정성뿐 아니라 핵종 누출의 경로 등으로 사 용될 수 있으므로 이들에 대한 조사와 분석은 필수적이다. 특히 복잡하고 다양한 암종으로 구성된 우리 나라 지질환경뿐 아니라 약 500 m 심부에 건설될 처분시설의 심도를 고려할 때, 암종에 관한 특성과 함 께 천부와 심부의 균열 특성을 파악하는 것이 중요하다. 이에 본 연구에서는 처분모암으로 고려되었던 암종 중 국내에 분포하는 4개 암종(화강암, 퇴적암, 편마암, 화산암)에 관해 750 m급 심부 시추에서 획 득한 균열 특성에 관해 연구하였다. 연구 지역을 선정하기 위하여 국내 지체구조를 고려하였으며, 주제 특성 상 시추 부지를 선정하기 어려운 점을 고려하여 적용한 시추 부지 획득 전략도 소개하였다. 본 연구 에서 균열 정보는 코어 로깅과 공내 영상 촬영을 통해 획득하였다. 획득한 균열을 분석한 결과, 화강암의 경우 고각의 절리군이 우세하게 나타났지만, 퇴적암의 경우 대부분 저각의 절리가 우세하고 층리와 관련 이 있는 것으로 판단되었다. 편마암의 경우는 중각 또는 저각의 절리가 우세하게 나타났으며, 엽리와 유 사한 경사를 가졌다. 화산암은 유동 구조나 층리에 평행하게 발생하는 저각의 절리가 우세한 지역도 있 으나, 고각의 절리가 발생한 지역도 있었다. 또한 지표에서 조사된 지질조사와 선형구조의 정보는 심부 시추공에서 획득한 정보와 일치하지 않는 경우가 있어 고준위방사성폐기물 처분부지를 선정하기 위해 서 반드시 심부 시추공을 통한 조사가 수행되어야 함을 알 수 있었다.
Abstract
The characteristics of fractures in high-level radioactive waste disposal sites are crucial not only for the stability of disposal facilities but also for identifying potential pathways for leaked radionuclide. Therefore, investigation and analysis of these fractures are essential. Considering the complex and diverse rock types of Korea's geological environment, as well as the depth of approximately 500 meters at which the disposal facilities will be constructed, it is important to understand fracture characteristics both in shallow and deep formations. In this study, we focused on the fracture characteristics of four rock types—granite, sedimentary rock, gneiss, and volcanic rock—commonly found in Korea and considered as candidate host rocks for disposal site. These fracture data were obtained from 750-meter-deep boreholes. The study sites were selected based on Korea's tectonic regimes. Given the challenges of selecting drilling sites for such investigations, the strategy employed to decide suitable drilling locations is also introduced. Fracture information was obtained through core logging and televiewer. The analysis revealed that in granite, high-angle fracture sets were predominant, whereas in sedimentary rock, most fractures were low-angle and appeared to be related to bedding. In gneiss, medium- to low-angle fractures were dominant, exhibiting inclinations similar to foliation. Volcanic rock displayed a mixed pattern, with low-angle fractures parallel to flow structures or bedding in some areas, while high-angle fractures were also observed in the other. Further- more, discrepancies were found between geological surveys and lineament data obtained from surface investigations and those from deep boreholes. This indicates that conducting deep borehole investigations is indispensable for selecting suitable sites for high-level radio- active waste disposal.
참고문헌 (14)
- Bae, S. H., "Hydraulic characteristics of deep and low permeable rock masses in Gyeongju area by high precision constant pressure injection test", Tunnel and Underground Space, 31(4), pp.243~269 (2021)
- Cheon, D. S., "Analysis of Joint Characteristics and Rock Mass Classification using Deep Borehole and Geophysical Logging", Tunnel & Underground Space, 34(4), pp.330~354 (2024)
- Cheon, D. S., "Preliminary study on candidate host rocks for deep geological disposal of HLW based on deep geological characteristics", Tunnel and Underground Space, 34(1), pp.28~53 (2024)
- Cheon, D. S., "A study on nationwide maps with geoenvironmental information and geological characteristics of bedrock for HLW Disposal", Journal of the Korean Society of Mineral and Energy Resources Engineers, 59(3), pp.276~292 (2022)
- Cheon, D. S., "A study on key parameters and distribution range in rock mechanics for HLW geological disposal", Tunnel and Underground Space, 32(6), pp.530~548 (2022)
- Choi, E. K., "A Study on the Chemical Index of Alteration(CIA) and Geotechnical Properties of Igneous Rocks by Weathering", Doctor, pp.2011
- "Nuclear Waste Storage Pools to Be Full in Six Years… Delaying New Facilities Could Lead to ‘Nuclear Plant Shutdown’ Concerns" (2024)[URL]
- Development of nationwide geoenvironmental maps for HLW geological disposal, "KIGAM", 603~, pp.GP2017-009-2019 (2019)
- Research on rock properties in deep environment for HLW geological disposal, "KIGAM", 330~, pp.GP2020-002-2021 (2021)
- Research on rock properties in deep environment for HLW geological disposal, "KIGAM", 108~, pp.GP2020-002-2022 (2022)
- Geological Map of Korea, Geological Report of Namwon-do (1, "50,000)", Kim, D. H., 1984
- Lee, B. J., "Special Theme - Geology to understand the land_ground - volcanic activity and volcanic rock", tuff, Newsletter Ground, 2019, ~
- Lee, H., "A Study on Hydrogeological Characteristics of Deep-Depth Rock Aquifer by Rock Types in Korea", Tunnel and Underground Space, 34(4), pp.374~392 (2024)
- Lee, H., "Standard procedures and field application case of constant pressure injection test for evaluating hydrogeological characteristics in deep fractured rock aquifer", Tunnel and Underground Space, 33(5), pp.348~372 (2023)