用過核燃料的最終處置方式，必須足以防止廢料污染物釋放至生物圈，而對環境與生物造成危害。國際間對此一課題進行許多評估與研究，經由安全性、技術與經濟等多方考量，深地層處置(deep geologic disposal)被認為是最安全可行的處理措施。 本研究以深地層處置之概念為基礎，參考瑞典相關文獻，考慮熱源、緩衝材、回填材、岩石之熱與水力特性，並考量國內文獻對處置場尺寸、初始溫度條件與熱源散熱強度的設計，以有限元素軟體ABAQUS 進行依序耦合熱—水—力學之分析。 在整個處置場完成各材料設置、回填與密封後，地下水的入侵將無可避免，各材料之水力傳導係數與孔隙壓力邊界條件將影響各材料飽和度增加的速率；就包覆著廢料罐的緩衝材來說，地下水入侵會使其飽和度上升，導致熱傳係數增高，熱傳遞速度加快，而溫度迅速向外擴散的結果使得材料結構的不穩定性增加。 本研究主要針對緩衝材熱傳導係數隨飽和度變化的影響，進行依序耦合熱—水—力分析，其結果顯示飽和度歷時變化將對處置場之最高溫度造成顯著的影響。 A nuclear fuel waste final disposal must provide protection to the creatures and the environment from the hazards of contaminant release.There are many international studying and evaluation about the abject. Considering of safety, technology and economy, the method of deep geologic disposal is regarded as the most safety and stable way. In this study, based upon the concept of the deep disposal method, thinking about the thermal, hydrological and mechanical properties of the paper in Sweden. In addition of considering the size of repository, initial condition and boundary condition of the internal paper. Using the “staggered solution technique” to make coupled of thermal-hydro-mechanical calculations by finite element code ABAQUS. After the completion of the emplacement, filling and sealing .The invasion of the groundwater is not avoidable. The hydraulic conductivities of materials and pore pressure boundary condition will influence the rate of saturation. In the buffer material, the increasing saturation would cause the thermal conductivity to go up. The fast diffuse heat would result in structurally unstable of thematerials. The study directed at the influences of the saturation histories on the thermal conductivity of buffer material, to make the scoping analyses. In the results, the maximum temperature in the repository has obvious change due to the saturation histories.
