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在Wei等[1]基于多相孔隙介质非平衡渗流理论提出的多孔介质热动力学混合物理论模型的基础上,建立了一个能描述不考虑土骨架变形的非饱和土土-水特征曲线动态模型。依据非饱和土土-水特征曲线动态模型,推导出不考虑土骨架变形的气-水两相非饱和土的饱和度演化方程。利用饱和度演化方程并结合多步流动瞬态试验的成果,通过数值反演,提出了一种能利用多步流动瞬态试验数据快速确定非饱和土土-水特征曲线的方法。通过对低液限粉土及低液限黏土的多步流动瞬态试验研究发现,饱和度演化方程能较好地模拟非饱和土在小基质吸力步长变化下饱和度的变化规律。此外,通过对多步流动瞬态试验试样饱和度的模拟确定的非饱和土土-水特征曲线与联合测试系统测得的土-水特征曲线的结果较为一致。
Based on the theoretical model of thermodynamic mixture of porous media proposed by Wei et al. [1] based on the theory of non-equilibrium seepage flow in heterogeneous porous media, a dynamic model of unsaturated soil-water characteristic curve, which can describe the deformation of unsaturated soil, . According to the dynamic model of soil-water characteristic curve of unsaturated soil, the evolution equation of saturation of gas-water two-phase unsaturated soil without considering soil skeleton deformation is deduced. Based on the saturation evolution equation and the results of multi-step flow transient tests, a numerical method was proposed to quickly determine the soil-water characteristic curve of unsaturated soils using multi-step flow transient test data. Through the multi-step flow transient test of low liquid limit silt and low liquid limit clay, it is found that the evolution equation of saturation can better simulate the variation of saturation of unsaturated soils under small substrate suction steps. In addition, the results of soil-water characteristic curves of unsaturated soil determined by the simulation of multi-step flow transient test sample saturation are in good agreement with the soil-water characteristic curves measured by the joint test system.