In this article, on the basis of theories of heat transfer, seepage mechanics, and elastic plastic mechanics, coupling mathematical models for the temperature field of a coal body, the seepage field of dry distillation gas, and the deformation field of the coal body in the process of underground coal gasification are established. Using the theory of finite elements, the coupling solution method is deduced and the calculation results are analyzed with the example. The agreement between the calculated and measured values indicates the numerical simulations of the temperature field, seepage field, and stress field within the gasification area are correct, which provides necessary theoretical evidence for the quantitative study of the process of underground coal gasification. [References: 21]
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