Geoscientific Research of Bedrock for HLW Geological Disposal using Deep Borehole

Dae-Sung Cheon; Won-Kyong Song; You Hong Kihm; Seungbeom Choi; Seong Kon Lee; Sung Pil Hyun; Heejun Suk

doi:10.7474/TUS.2022.32.6.435

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2022 Vol.32, Issue 6 Preview Page Next Page

Technical Note

Geoscientific Research of Bedrock for HLW Geological Disposal using Deep Borehole 고준위방사성폐기물 심층처분을 위한 심부 시추공을 활용한 암반의 지구과학적 조사

31 December 2022. pp. 435-450

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Abstract

In step-by-step site selection for geological disposal of high-level radioactive waste, parameters necessary for site selection will be acquired through deep drilling surveys from the basic survey stage. Unlike site investigations of rock mass structures such as tunnels and underground oil storage facilities, those related to the geological disposal of high-level radioactive waste are not only conducted in relatively deep depths, but also require a high level of quality control. In this report, based on the 750 m depth drilling experience conducted to acquire the parameters necessary for deep geological disposal, the methodology for deep drilling and the geology, geophysics, geochemistry, hydrogeology and rock mechanics obtained before, during, and after deep drilling are discussed. The procedures for multidisciplinary geoscientific investigations were briefly described. Regarding in-situ stress, one of the key evaluation parameter in the field of rock engineering, foreign and domestic cases related to the geological disposal of high-level radioactive waste were presented, and variations with depth were presented, and matters to be considered or agonized in acquiring evaluation parameters were mentioned.

Keywords

High level radioactive waste

Geological disposal

Deep borehole investigation

Geoscientific research

In-situ stress

고준위방사성폐기물 심층처분을 위한 단계별 부지선정에 있어 기본조사부터 심부 시추조사를 통해 부지선정에 필요한 요소들을 획득할 예정이다. 터널이나 유류지하저장소 등과 같은 암반구조물의 지반조사와 달리 고준위방사성폐기물 처분과 관련된 지반조사는 매우 깊은 심도까지 수행될 뿐 아니라 높은 수준의 품질관리가 요구된다. 본 보고에서는 심부 지질특성화에 필요한 요소를 획득하기 위해 수행하였던 750 m급 심부 시추경험을 토대로 심부 시추에 대한 방법론과 심부 시추 전, 시추 중, 시추 후 획득하는 지질학, 지구물리학, 수리화학, 수리지질학, 암반공학 등 다학제적 지구과학적 조사에 대한 절차 등에 대해 간략하게 서술하였다. 암반공학분야의 핵심 평가인자 중 현지응력에 대해서는 고준위방사성폐기물 심층처분관련 국외 사례와 국내 사례를 통하여 심도에 따른 응력변화를 고찰하였다.

키워드

고준위방사성폐기물

심층처분

심부 시추조사

지구과학적 조사

현지응력

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 32
No :6
Pages :435-450
Received Date : 2022-12-09
Revised Date : 2022-12-12
Accepted Date : 2022-12-19
DOI :https://doi.org/10.7474/TUS.2022.32.6.435

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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