核廢料為具有長半衰期之高放射性物質，對人類生活環境與生物圈具有威脅性，須以能確保長期隔絕之方式加以處理。經過世界各核能使用先進國家之研究顯示，較穩定且安全之處置法為深層地質處置(Deep Geological Disposal)。
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，考慮膨潤土與回填材料所具備之熱性質及力學特性，藉由FLAC3D與TOUGH2兩套數值分析軟體分析深覆蓋最終處置場之周圍岩體，探討核廢料處置後其周圍深層飽和岩體之熱力-水力-力學偶合 (CoupledThermo-Hydro-Mechanical)行為。
經研究並多方面分析後認為於台灣地區500m深之處置場中，後發現雙處置坑間距越小其溫度場間的影響、應力的作用、塑性區的範圍及位移量都有變大的趨勢。因此考慮最佳空間利用之最佳化配置來提供處置場之使用效率，以降低核廢料之處理成本；本研究認為於台灣地區500m深之處置場中，採用初始地溫為30～35℃之結晶岩層，處置坑之間距8公尺到10公尺，處置隧道之間距20公尺到25公尺較為適宜。而處置場址中塑性區域，多為其安全性與穩定性之參考依據，並於該發生區域須多採以補強之措施，以確保最終處置場址可持續其阻絕功能。

Because of inherent radioactivity, the spent nuclear fuel would threaten our environment and also the biosphere. We 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 leading countries of the advanced technology in nuclear as the most stable and safe method.
This research is based upon the idea of deep geological disposal proposed by Swedish research groups. This thesis considered many factors, including the thermal and mechanical properties of the bentonite and backfill. By using the numerical analysis package, FLAC3D and TOUGH2, this thesis attempted to analyze the distributions of the temperature, hydraulic and mechanical fields of the geological repository disturbed by waste canisters.
Several scenarios are taken into account: a single storage hole of different initial temperatures, and two-storage-hole and two-tunnel of different distances. This thesis suggests that the appropriate distances from canister to canister are 6~8m and those from tunnel to tunnel are 25m under the conditions of initial temperature 26～28℃ and 500m in-situ in Taiwan crystalline bedrock. Through stress analysis, this study shows that the tensile regions are the most critical ones where should be reinforced to ensure the capability of isolation of the disposal site.

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