Optimized Investigation Methods for Discontinuities and a Stepwise Investigation Strategy for Deep Geological Disposal of High-Level Radioactive Waste; 고준위 방사성폐기물 심층처분을 위한 최적화된 불연속면 조사 방법 및 단계별 조사 전략 제안

초록

Rock discontinuities influence groundwater flow and the mechanical stability of engineered structures in deep geological repositories for high-level radioactive waste. Here, I present a methodological frame work and a stepwise investigation strategy to support the systematic characterization of discontinuities during site selection and evaluation. Rather than conducting a site-specific analysis, I propose a general ized approach based on the classification and quantification of key attributes of the discontinuities (including orientation, spacing, persistence, roughness, and aperture), following international standards such as the suggested methods of the International Society for Rock Mechanics and Rock Engineering (ISRM). The investigation techniques covered include surface outcrop surveys (manual and remote sensing), borehole imaging and hydrogeological tests, and subsurface investigations at underground research laboratories (URLs), focusing on the identification of excavation damaged zones (EDZs). The proposed strategy is structured into three investigation stages: regional-scale reconnaissance, site-scale characterization, and in-depth repository-scale assessment. Each stage has clearly defined objectives, methods, and data integration procedures. This study aims to provide a practical reference for improving the efficiency, consistency, and reliability of discontinuity investigations for the characterization of deep disposal sites, particularly in contexts where long-term geological safety is paramount.

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