The phase change phenomena of frozen soil were simulated based on Characteristics of Heaviside staircase function and Gaussian jump function, and convergence and stability were improved.

• 利用Heaviside函数的阶梯性及Gaussian函数的突变性模拟了冻土相变过程能量的突变,提高了数值求解收敛的速度和稳定性。