裂隙岩體由裂隙與岩石基質組成，其差異甚大的導水特性致使地下水流與傳輸模擬工作備受挑戰；岩體中若額外存在工程結構物，其複合水力特性與跨尺度分析需求將額外提升議題的複雜程度。本研究以裂隙岩體中含處置設施物件的參考案例為研究對象，使用數值分析軟體DarcyTools進行跨尺度與複雜水力單元的模擬物件、計算網格、離散裂隙網路之生成，並藉由等效水力特性參數轉換後輸入數值網格執行穩態地下水流場及穩態鹽度分布模擬，同時藉由裂隙截切處置設施分析，作為潛在放射性核種準確的釋出位置並進行質點追蹤模擬；此外，藉由考慮水力傳導係數變異、多組實現值之有效離散裂隙網路及引入隨機漫步法所執行的一系列變異案例，以提升地下水模擬及傳輸分析之可信度。結果顯示本研究已完整執行裂隙岩體中具複雜單元及使用網格加密技術考慮不同尺度議題之地下水流與傳輸模擬，並成功後處理為性能與安全評估所需之功能測度值。變異案例的結果顯示母岩的水力傳導係數變異為主控地下水流及傳輸模擬的主要因素；多組有效離散裂隙網路結果則可增加實現值對於功能測度值之影響；隨機漫步法的使用則增加釋出途徑及其資訊的不確定性。研究結果可供處置計畫在地質調查與安全評估工作之參考。;The discrepancy in flow properties between fractures and the rock matrix in fractured rock formations has made flow and transport simulation challenging. Additionally, the presence of engineered components within fractured rock further complicates matters due to the composite hydraulic properties and the need for multi-scale analysis. This study focuses on deep geological disposal in fractured rock, employing the numerical analysis software DarcyTools to create simulation objects, computational grids, and generate discrete fracture networks. Equivalent hydraulic properties are converted to conduct steady-state groundwater flow and salinity distribution simulations. The analysis of intersections between fractures and the disposal facility serves as an accurate release point for potential radionuclides, and particle tracking simulations are employed to obtain transport information. By considering the variability of hydraulic parameters in hydrogeological units, realizations of effective discrete fracture networks, and involving the random walk particle tracking method, the credibility of groundwater flow simulation and transport analysis was enhanced. The results demonstrate that this study has successfully conducted groundwater flow and transport modeling in fractured rock for a deep geological repository. Post-processing was performed to provide performance measures for performance and safety assessments. The results of various cases indicate that the variability in hydraulic conductivity of the rock mass is the primary factor controlling groundwater flow and transport simulation. The use of the random walk method increases the uncertainty of release pathways, while multiple realizations of effective discrete fracture network results can amplify the impact of realizations on functional metrics. The findings of this study can serve as a reference for future geological surveys and safety assessment work in spent nuclear fuel final disposal projects.
