A Simulation of The Relationship Between The Quantity of In-filled Water and Spacing of Excavated Holes in Deep Underground Rocks using Finite Element Method

[[abstract]]高放射性廢棄物含有核分裂產物及長半衰期之放射性物質，對人類及生活環境具有潛在性危險，須採取與人類生活環境長期隔離方式處理。經過技術、經濟、安全等多層面之評估與相關研究顯示，目前以深層地質處置(Deep Geologic Disposal)方式來處理用過核燃料或高放射性廢料被認為較穩定且安全之措施。 本研究主要探討深地層岩盤內開挖孔之入滲量，且以瑞典KBS-3V處置孔為設計規範，應用美國洛薩拉摩國家實驗室(Los Alamos National Laboratory) George A.Zyvoloski 等研究員於1988 年所發展之有限元素程式FEHM程式，藉此程式進行兩種模式分析，1.模擬深地層岩盤內開挖孔之入滲量與間距關係，進而找出處置孔之最佳間距；2.處置孔在開挖時會形成開挖損壞區(Excavation Damaged Zone 簡稱EDZ)，而岩石EDZ範圍將會對處置孔周圍岩體之入滲量產生變化，故分析EDZ範圍對開挖孔入滲量之敏感度。而最後再針對上述所研究的內容進行整理得到結論與建議。[[abstract]]The high-level radioactive waste has nuclear substance that could potentially endanger the human’s life and environment Therefore it is necessary to find a suitable method to isolate the waste from human’s life circle permanently Currently the method of deep geological disposal for radioactive waste has been chosen by all the nuclear-using countries The assessment of disposal methods in view of technology economics and safety and research results indicate that the Deep Geologic Disposal method is considered as the most stable and secure method to disposal Spent Nuclear fuel or high-level radioactive waste The main purpose of this study is to calculate the quantity of in-filled water of excavated holes in deep underground rock The design code for the KBS-3V hole and a Finite Element program FEHM originally developed by Zyvoloski et al in 1998 in Los Alamos National Laboratory were employed in this thesis Two types of numerical simulation were conducted: (1) the simulation of the relationship between the quantity of in-filled water and the spacing of excavated holes and further identification of the optimum spacing between the disposal holes; (2) the influence and sensitivity study of the excavation damaged zone (Excavation Damaged Zone EDZ) which is usually formed in the period of hole excavation to the infiltration to the excavated hol