To simulate the soil water movement process of deformable soils, a modified Richards model considering soil deformation (RMSD) was established. In the model, new parameters were introduced, including deformable soil porosity, deformable soil saturated hydraulic conductivity and unsaturated hydraulic conductivity of expansive soils, which varied with soil depth and time under the effect of soil deformation. The newly introduced parameters originated from physical properties of the soils and their calculation formulas were suggested. One-dimensional infiltration–runoff experiments were performed to evaluate the performance of the RMSD. The results showed that average relative errors (ARE) of simulated runoff intensity and cumulative infiltration (by the RMSD) ranged from −10.0% to −1.0% and from −1.0% to 11.0%, respectively, and Nash efficiency coefficients (NSE) of simulated cumulative infiltration (by the RMSD) were larger than 0.90. As the RMSD model is much better than the traditional Richards model (TRID) in fitting the observations of soil cumulative infiltration and runoff intensity, it is believed that the newly suggested model provides a suitable tool to depict the soil water movement in deformable soils.

为了模拟可变形土壤的水分运动过程，建立了考虑土壤变形（RMSD）的改进Richards模型。该模型引入了新参数，包括膨胀土的可变形土壤孔隙度，可变形土壤饱和导水率和非饱和导水率，这些参数在土壤变形的作用下随土层深度和时间的变化而变化。提出了新的参数，这些参数源自土壤的物理性质，并提出了计算公式。进行了一维渗透-径流实验以评估RMSD的性能。结果表明，模拟径流强度和累积入渗（通过RMSD）的平均相对误差（ARE）分别为-10.0％至-1.0％和-1.0％至11.0％。模拟累积渗透（通过RMSD）的纳什效率系数（NSE）大于0.90。由于RMSD模型在拟合土壤累积入渗和径流强度的观测结果方面比传统的Richards模型（TRID）好得多，因此可以相信，新建议的模型提供了一种描述可变形土壤中土壤水分运动的合适工具。