Abstract: Coal mining has developed gradually to deep mining.With the sharp increasing of confining pressure and pore-water pressure,the research results of shallow frozen soil are not suitable for deep frozen soil.Aiming at the key problem that high confining pressure and high pore-water pressure impacting on the freezing process,based on heat transfer,percolation theory and structural mechanics correlation theory,a mathematical model of coupled moisture,temperature and stress was established to analyze the temperature changes,moisture migration velocity,frozen stress and frost deformation of deep thick soil in freezing process.The calculation results showed that high confining pressure could inhibit the frost heaving,but frozen soil had a great internal stress accumulation,which had great harm to freeze construction in deep alluvium.