用過核燃料的最終處置方式，必須採取與人類生活環境長期隔絕之方式加以處理，避免導致對環境及生物圈造成危害。經過世界各核能使用先進國家之安全性、技術與經濟等多方考量，較穩定且安全之處置法為深層地質處置(Deep Geological Disposal)。高放射性核廢料地下深層處置場的周圍岩體，原本所處之溫度場與水流場為一穩定狀態，但由於受到工程進行等外來因素的影響，進而改變其平衡狀態，隨後核廢料體、緩衝材料及回填材料安置完成後，整個過程將引起熱－水力效應。
為確認本研究所使用之數值模擬程式Geo-Studio的可行性與適用性，根據Lennart and Jan於1999年提出之文獻進行模式驗證，對照數值分析結果後並進行討論。本研究以核廢料深層處置為基本概念，並參考瑞典之相關研究，考慮緩衝材料與回填材料所具備之熱力性質與水力特性，藉由有限元素軟體Geo-Studio耦合熱－水力分析，並針對真實最終處置場情況，探討在不同處置方式，處置場之溫度分布、溫度歷程、飽和度歷程與水流方向之變化。
本研究認為於地下500m處置場中，採用初始地溫為35℃的情況下，模擬結果顯示當雙處置坑間距為8m，雙處置隧道間距為25m時較為適宜。

The final disposal method of nuclear waste must take steps to permanently exclude the spent nuclear fuel away from our activity environment in order to avoid any possible danger. The method of deep geological disposal is regarded by the advanced technology countries in nuclear as the most possible method. The surrounding rocks exist in a stable condition between the fields of temperature and fluid flow originally, but the balance conditions are changed by the external factors such as engineering works. After the completion of emplacement, filling and sealing, the whole process will cause the thermal-hydraulic effects.
In order to confirm the feasibility and applicability of the simulation program of Geo-studio in this thesis, the validation of model have been carried out according the reference by Lennart and Jan(1999). This research is based upon the idea of deep geological disposal proposed by the Swedish research groups. This thesis considered many factors, including the thermal and hydraulic properties of the bentonite and backfill. By using the numerical analysis package, Geo-Studio, this research attempted to analyze the distribution of temperature, history of temperature and saturation, direction of fluid flow of the geological repository disturbed by waste canisters.
This thesis suggests that the appropriate distances between canisters are 8m and those from tunnel to tunnel are 25m under the conditions of initial temperature 35℃ and underground depth of 500m in-situ in crystalline bedrock.

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