在Wei&Muraleetharan基于非饱和土两相流交界面上的动态相容条件提出的多孔介质热动力学混合物理论模型基础上,推导出能描述溢出量与时间关系的溢出量演化方程。根据溢出量演化方程,结合一定变化规律的基质吸力序列,建立了给定基质吸力序列作用下利用多步流动试验瞬态溢出量数据确定非饱和土-水力学参数的方法。通过对低液限粉土、低液限黏土的多步流动试验研究发现,利用瞬态溢出量数据的拟合来确定非饱和土-水力学参数的方法而得到的各基质吸力作用下试样饱和度和渗透系数预估值,与联合测试系统测得的各基质吸力作用下试样的饱和度及渗透系数接近。 Based on the theoretical model of thermodynamic mixture of porous media proposed by Wei and Muraleetharan based on the dynamic compatibility condition of two-phase flow in unsaturated soil, an evolution equation of spillover volume that can describe the relationship between spillover and time is derived. According to the spillover evolution equation and the matrix suction sequence with a certain variation law, the method of determining the unsaturated soil-hydraulic parameters by using the transient spillover data of multi-step flow test under a given matrix suction sequence is established. Through the multi-step flow test of low liquid limit silt and low liquid limit clay, it is found that the sample under the action of each substrate suction obtained by fitting the transient spill volume data to determine the unsaturated soil-hydraulics parameter The estimated saturation and permeability coefficients are close to the saturation and permeability coefficients of the samples as measured by the joint test system for each substrate suction.