Linear thermoelastic analyses of structural models associated with underground coal gasification (UCG) are conducted in this dissertation. Idealized crack and cavity configurations simulating the Longwall Generator concept and linked vertical wells concept of UCG are studied by deriving closed form solutions. The relevance of the proposed models and their general applications are provided. Four different isotropic, homogeneous thermoelastic models with steady-state heat conduction and prescribed constant temperature boundary conditions at the crack or cavity surface are investigated. Despite the numerous limitations inherent in the development of the analytical structural models studied here, the results provide fundamental data for the possible interpretation of cavity configurations, roof stability and related information. This research also demonstrates that the thermomechanical responses are important in the consideration of UCG processes.