Kinematic and paleostress analyses in the KURT site to reconstruct the long-term structural evolution to apply for deep geological repository of nuclear waste  

作　　者：Ho-Seok Choi Francois Hategekimana Goeun Kim Jun-Yeop Kim Soolim Jung Kyung-Woo Park Young-Seog Kim 

机构地区：[1]Division of Earth Environmental System Sciences,Pukyong National University,Busan 48513,Republic of Korea [2]Department of Geology,College of Science and Technology,University of Rwanda,Kigali 3900,Republic of Rwanda [3]Division of Disposal Performance Demonstration Research,Korea Atomic Energy Research Institute,Daejeon 34057,Republic of Korea

出　　处：《Episodes》2024年第3期641-652,共12页地质幕(英文版)

基　　金：supported by the Institute for Korea Spent Nuclear Fuel(iKSNF);National Research Foundation of Korea(NRF)grant funded by the Korea government(Ministry of Science and ICT,MSIT)(No.2021M2E1A1085200).

摘　　要：High-level radioactive waste should be isolated from humans and society for over 100,000 years.Several factors should be considered for a geologically stable disposal site such as topography,faults,seismic activity,and hydrological properties.Brittle structures within the bedrock,such as faults,act as potential flow pathways for radioactive isotopes as well as significantly influence bedrock stability in the context of future seismicity.However,studies on fault behavior and deformation in underground settings,which are key components for site characterization,are relatively scarce compared with those at the surface.This study was conducted within the KAERI Underground Research Tunnel(KURT),an experimental tunnel focused on comprehending the structural evolution and designing nuclear waste disposal sites.To conduct a comprehensive structural study aimed at reconstructing the structural evolution of the study area in space and time,a preliminary lineament analysis was conducted using a length-weighted lineament analysis.Furthermore,kinematic analysis was conducted based on a cross-cutting relationship to establish the deformation history and change of paleostress condition.We identified three distinct brittle deformation stages evolving from a strike-slip to an extensional regime associated with the change of the maximum horizontal stress from ENE–WSW through NW–SE to NNE–SSW.This study underscored that a detailed study combining remote sensing lineament analysis,field structural surveys,and paleostress analysis could integrate and improve previously proposed methods for the selection of deep geological repositories.

关 键 词：nuclear waste disposal geologically stable disposal site kinematic analysis radioactive waste fault behavior deformation deep geological repository radioactive isotopes structural evolution 

分 类 号：P315.7[天文地球—地震学]