摘要 核廢料的處理，一直是各核能國家關切的問題。各國核廢料的處理方式傾向以深層地質處置(deep geological disposal)法作為最終處置設施，本研究即在此概念下進行分析。 研究中採用台灣核能研究所，所規範的台灣核廢料地下掩埋處置場模型，以有限元素分析法，並配合對稱、體積單元等概念化簡模型。本研究主要針對處置場的兩個參數進行比較，一種是改變初始溫度之地溫梯度，研究不同地溫梯度下處置場的最高溫度情形。另一種研究則是岩石之熱傳導係數，以改變熱傳導係觀察不同位置上之溫度。使用二維模型模擬處置孔進行分析，並與三維模型比較。 熱應力分析方面採用依序耦合熱應力分析(Sequentially coupled thermal-stress analysis），模擬台灣處置場完全封閉後，以緩衝材及回填材填滿，研究應力、位移及塑性區並進行討論。 ABSTRACT Decay heat of the nuclear waste material will cause influence on our environment. Most of the countries tend to handle the nuclear waste material by the way of the deep geological disposal, which is the final treatment facilities with deep geology. This investigate is analyzed under this concept. In this thesis, the concept from the Nuclear Energy Research Institute of Taiwan is adopted. Meanwhile, by using the finite element method and the concept of symmetry, and the represent volume unit is proposed to simplify the complicated structure. The change of initial temperature of geothermic gradient is in order to investigate the maximum temperature in the module. The thermal conductivity of the rock has been varied in order to investigate the influence of the temperature on different positions. It was analyzed by deposition hole of two-dimensional model and compared with three-dimensional model. The coupled thermo-mechanical effect of the Taiwan disposal field was calculated. The stress, displacement fields and plastic zone, including presence of buffer material and backfill material, were investigated.