Abstract：A kind of coupled thermo-hydro-mechanical model of dual-porosity fractured medium for saturated- unsaturated ubiquitous-joint rock mass，in which the stress field and the temperature field are single，but the seepage field is double，and the influences of sets，spaces，angles，continuity ratios，stiffnesses of the fractures on the constitutive relationship of the media can be considered，is established；and also the relative two- dimensional program of finite element method is developed. Taking an assumed nuclear waste repository for example，in which two cases of rock mass including dual-porosity medium and single-porosity medium respectively are simulated；and the temperatures，pore pressures，saturations，flow velocities and principal stresses in the buffer and rock mass are investigated. The results show that water flows from the dual-porosity medium into the buffer are quicker by far；the difference of temperatures in the calculation domain of two cases is very small，but there are obvious variations in magnitudes and distributions of the principal stresses in the near field for the two kinds of media；and the stress concentration in the single-porosity rock mass is larger.
