核能是一個可以提供穩定能源的方式，但是核能所產生的核廢料對人類的生活環境具有威脅性，因此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，較穩定且安全的處置法為深層地質處置(Deep Geological Disposal)。
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、水力特性及力學特性，由於深層岩體之溫度、水流及應力為相互影響，故在評估深層岩體時，應採取熱力-水力-力學耦合 (Thermo-Hydro-Mechanical Coupling ,T-H-M)之方式以探討其間之關係，藉由FLAC3D數值分析軟體分析深覆蓋最終處置場之周圍岩體，選擇花崗岩性之母岩為模擬場址，設計單孔及雙孔處置坑，比較核廢料放置與未放置時，處置場周圍的岩體與材料在受到核廢料罐放置之影響後的發展行為。
本研究發現於溫度分佈中，經過T-H-M耦合模擬之岩體溫度有向上並加速向外擴張之現象，而T-M耦合模擬之深層岩體為熱傳導形式所主導，其溫度呈現等量向外擴張之趨勢與經T-H-M耦合分析之現象不同。深層處置場之應力分布主要區域分別位於隧道頂拱、側邊及底部與貯存坑口周圍部分，在施工時應加強此區域以防止破壞。

Deep geological disposal is generally accepted as the most promising method for the permanent disposal of high-level nuclear waste. To confirm whether an underground repository design is mechanically stable or not, it is necessary to evaluate the stability of the repository under different conditions. In this study, a numerical analysis was carried out for the design parameters as well as site-parameters to determine the important parameters from the stability point of view. It was assumed that the repository is constructed in a deep underground granite rock, which is considered as one of host rocks in Taiwan.
This study presents the methodology in which a computer code FLAC3D (Fast Lagrangian Analysis of Continua) is executed for coupled thermal–hydraulic–mechanical (THM) analysis of fluid flow, heat transfer, and deformation in bedrocks. The FLAC3D is a widely used commercial code that is designed for rock and soil mechanics with thermo, mechanical and hydro mechanical interaction.
In order to understand the deep disposal (500m) of high-level nuclear waste on the THM behaviors, we consider the following 2 simple situations: (i) single-hole for vertical disposal, and (ii) double-hole for vertical disposal. We analyze the thermal conductivity at 5, 10, 50 and 100 years for the two situations, and discuss the influence of host rock on the temperature, stress and the direction of fluid flow.
The result shows that T-H-M coupling of the host rock temperature will expand outwards more than T-M coupling. And the temperature degree of rock by T-H-M coupling is less than the T-M coupling; Tension area is mainly distributed in the bottom of the tunnel, crown of the tunnel and the area surround the disposal; fluid flow has the convection in the rock and related to the temperature.

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