Nonlinear analysis on moisture-heat coupling for rocks during freezing-thawing process

The frozen disaster is a problem not to be ignored in geotechnique and engineering field.According to the balance of mass and energy,a nonlinear governing equation for the coupled problem of moisture-heat is estab-lished by considering the heat conduction,moisture and mass exchange,the heat and moisture gradient on the seepage.The temperature field and moisture field in the surrounding rock of Dabanshan tunnel in the cold region is numerically simulated,the law of moisture-heat coupling transfer in the rock tunnel is analyzed.The simulating result shows that the moisture transfer under frozen force and temperature gradient,it’s velocity at the side wall is maximum;the frozen circle will be thinner when taking into account the moisture field and be much thinner if the seepage coefficient be increased,the moisture field influences the redistributing of temperature field greatly;The suitable heat preservation measures must be taken in order to reduce engineering damage under the frost and thaw condition in cold regions.The simulating result is similar to the current results and engineering experience.