A three-dimensional soil water characteristic surface model considering deformation and hysteresis effect
Cai Guoqing1,2 Tian Jingjing2 Li Jian1,2 Zhao Chenggang1,2
1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Abstract：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.
