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Alonso等人提出的非饱和土弹塑性本构模型(BBM),不能用于预测膨胀性非饱和土的力学性质。现有的膨胀性非饱和土的弹塑性模型(BExM),其微观参数及微宏观变形的转换关系确定非常困难。从宏观角度,在已有的非膨胀性非饱和土水力特性和力学性质耦合的弹塑性本构模型的基础上,发展和建立了一个可预测非饱和膨胀土的水力特性和力学特性的弹塑性本构模型。模型引入不同形状的等孔隙比线与屈服线,并考虑了变形对土水特性的影响。对已公开发表的非饱和膨胀土的试验结果进行预测,包括常净应力的吸湿试验,吸力不变的等向压缩试验及三轴剪切试验。预测结果表明该模型能够定量的描述膨胀性非饱和土的水力和力学特性。
The unsaturated soil elastoplastic constitutive model (BBM) proposed by Alonso et al. Can not be used to predict the mechanical properties of expansive unsaturated soils. The elastic-plastic model (BExM) of existing expansive unsaturated soils, whose microscopic parameters and micro-macro-deformation transformations are very difficult to determine. Based on the elastoplastic constitutive model coupled with the hydraulic and mechanical properties of non-expansive unsaturated soils, a macroscopic and elastic-plastic constitutive model was developed and established to predict the hydraulic and mechanical properties of unsaturated expansive soils Constitutive model. The model introduces equal-porosity ratio lines and yield lines of different shapes, and considers the effect of deformation on soil-water characteristics. The test results of the publicly-published unsaturated expansive soils are predicted, including the constant net stress moisture absorption test, the constant suction suction test and the triaxial shear test. The prediction results show that the model can quantitatively describe the hydraulic and mechanical properties of expansive unsaturated soils.