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非饱和土即便在不排水、不排气条件下也将发生体变,这为预测非饱和土不排水、不排气力学特性带来了困难。基于三相孔隙介质理论,结合非饱和土的弹塑性本构模型推导了不排水、不排气条件下非饱和土三轴剪切三相耦合控制方程,对非饱和土的不排水、不排气三轴剪切特性进行预测。数值模拟结果表明,此方法能够描述非饱和土在不排水、不排气条件下的水力–力学特性,如体缩特性、孔隙水压力和孔隙气压力增长以及饱和度增大等特性。数值计算结果与室内试验结果一致,证实了所提数值分析方法的合理性。
Unsaturated soil, even under undrained and non-exhausted conditions, will undergo volume change, which makes it difficult to predict the undrained and undrained mechanical characteristics of unsaturated soils. Based on the theory of three-phase porous media and the elasto-plastic constitutive model of unsaturated soils, the triaxial shear governing equation for unsaturated soils under undrained and non-exhausted conditions is deduced. For undrained unsaturated soils, Gas triaxial shear characteristics are predicted. The numerical simulation results show that this method can describe the hydraulic-mechanical properties of unsaturated soils under undrained and non-exhausted conditions, such as the shrinkage characteristics, the increase of pore water pressure and pore pressure, and the increase of saturation. The numerical results are consistent with those of the indoor test, which proves the rationality of the numerical analysis.