一种统一非饱和土水-力-气三相耦合本构理论模拟方法

非饱和土在不排水不排气条件下土体仍会发生变形,因此非饱和土弹塑性本构理论模拟有必要考虑孔隙比的变化.本文推导了不同排水排气条件下(不排水、排气,不排水不排气,排水排气)非饱和土弹塑性本构理论预测控制方程,可用来预测非饱和土在不同排水排气条件下的力学特性行为.通过与试验结果对比分析可知,该方法能够较好地再现室内试验结果,描述非饱和土在不同排水排气条件下的水-力-气耦合行为.

A unified method of soil water-force-air coupling constitutive model for unsaturated soil

Unsaturated soils may still cause soil deformation under the undrained and unvented conditions. Therefore, it is necessary to consider the change of void ratio in the simulation of elastoplastic constitutive theory of unsaturated soil. This paper derives the predictive control equations of elastoplastic constitutive theory of unsaturated soil under different drainage and exhaust conditions (undrained and exhausted, undrained and unvented, drained and exhausted), which can be used to predict the mechanical behaviors of unsaturated soil under different drainage and exhaust conditions. Through comparative analysis with experimental results, it can be seen that this method can reproduce the experimental results well and describe the hydraulic coupling behavior of unsaturated soils under different drainage and exhaust conditions.