考虑变形及滞回效应影响的三维土-水特征曲面模型

A three-dimensional soil water characteristic surface model considering deformation and hysteresis effect

为研究变形和滞回效应对非饱和土水-力耦合特性的影响,以边界面理论为基础,建立一个同时考虑变形及滞回效应影响的三维非饱和土土-水特征曲面模型,所建立模型可完整地描述非饱和土的水-力耦合特性。提出的本构方程以吸力和孔隙比为自变量,以饱和度为因变量,建立三维土-水特征曲面模型,通过编程实现了本模型的预测功能。通过程序的预测结果与一系列不同应力和水力路径下的试验结果进行对比,在饱和度-吸力/孔隙比二维平面及饱和度-吸力-孔隙比三维空间中,均验证了所建立模型的适用性及预测精度。

Based on the theory of bounding surface, a three-dimensional soil water characteristic surface model considering the deformation and hysteresis effect is established and the model can well describe the hydro-mechanical coupling behavior of unsaturated soil. In the constitutive equation of the model, the suction and void ratio are taken as the independent variables and the saturation is taken as dependent variable. The prediction results are realized by programming. The three-dimensional soil water characteristic surface model is established in the saturation-suction-void ratio space, and the applicability and prediction accuracy of the established model are verified based on a series of experimental results in both the two-dimensional plane of saturation-suction/void ratio and three-dimensional space of saturation-suction-void ratio.