Abstract：One kind of coupled thermo-hydro-mechanical model of dual-porosity medium for saturated-unsaturated ubiquitous-joint rock mass was established, and also the relative two-dimensional program of finite element method was developed. Taking a hypothetical nuclear waste repository in an unsaturated dual-porosity rock mass as the calculation example, three cases in which the thermal water diffusivities are different were simulated numerically, and the temperatures, pore pressures, saturations, flow velocities and principal stresses in the rock mass were investigated. The results show：the temperature fields and the stress fields of three cases are near the same；when the thermal water diffusivity is larger the nagative pore pressures in near field reach very high values，the nagative fracture pressures decrease to some extent and the saturate degrees change accordingly；if the thermal water diffusivity is small to a certain extent its influence will disappear.
2010, Vol. 31 
