Coupled model of heat-seepage-deformation FEM for jointed rock masses

摘要

Based on the principles of equilibrium, continuity and conservation of energy of the multi-phase jointed medium, a heat-seepage-deformation (HHSD) coupling model is established for the jointed rock masses in a cold region. A numerical solution using finite element method (FEM) for this proposed model is developed on the platform of the Austrian software FINAL and a test calculation is also conducted for the thermal elastic consolidation of a one-dimen- sional sand column made previously by Aboustit. The practical analysis for a coal mine subjected to a gas burning demonstrated that the surface settlement was not only related to the temperature variation, but also related to the water migration. When reducing the permeability coefficient of the rock mass greatly, the settlement increases only slightly due to the decrease of the pore water drainage. When increasing the conductivity slightly, the settlement increases greatly.