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土体孔隙分布对土水特征曲线具有决定性影响。虽然土体孔隙分布随变形的演化规律较为复杂,但实验研究表明,土体在变形过程中,孔隙分布的基本形态未发生显著变化、统计分布特征基本不变。基于这一结论,假定变形后的孔隙分布函数可以从参考状态孔隙分布函数经过平移、缩放得到。在此基础上,建立了考虑土体变形并反映滞回效应的土水特征曲线模型。由于变形对土水特征曲线的影响是通过孔隙分布随变形的改变来表征的,因此模型参数的物理意义明确,仅有7个参数,均可通过常规室内试验确定。最后,通过一系列试验数据验证了该模型的正确性与可靠性。
Soil pore distribution has decisive influence on soil water characteristic curve. Although the evolution of soil pore distribution with deformation is more complicated, experimental studies show that the basic shape of pore distribution does not change significantly during deformation, and the statistical distribution is basically unchanged. Based on this conclusion, it is assumed that the deformed pore distribution function can be translated and scaled from the reference state pore distribution function. Based on this, a soil-water characteristic curve model considering the soil deformation and reflecting the hysteresis effect is established. Since the effect of deformation on the soil-water characteristic curve is characterized by changes in pore distribution with deformation, the physical meaning of the model parameters is clear. Only seven parameters can be determined by routine laboratory tests. Finally, a series of experimental data verify the correctness and reliability of the model.