为深入探究相变潜热及冻胀作用下粉质黏土地基的温度和变形特征，采用离散元软件MatDEM以郑州二七广场地铁站的人工冻结工程为背景进行冻胀模拟，并在模拟过程中加入相变潜热模型，提取温度与位移结果并与现场实测数据进行对比。结果表明： 1）模拟结果与实测结果基本吻合，加入相变潜热后能够更加合理有效地模拟粉质黏土地层的冻胀作用； 2）土体竖向位移云图在冻胀过程中会呈放射状扩散，且位移量的增长速率会呈现先增大后减小的现象。

To investigate the temperature and deformation characteristics of the silty clay foundation under the effect of the frost heaving, the discrete element software MatDEM is used to simulate the frost heaving of the artificial freezing project of Zhengzhou Erqi square metro station. The phase change latent heat model is established to extract the temperature and displacement results to compare with the measured data in the field. The results show the following: (1) The model can effectively simulate the frost heaving of silty clay foundation, and combination application of the phase change latent heat theory can better effectively simulate the frost heaving effect of silty clay. (2) The vertical displacement nephogram of soil shows a radial spread in the process of frost heaving, while displacement increases first then decreases.