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膨胀性非饱和土中液相与固相基质间的相互作用,依据其形成机理不同,可分为毛细和物理-化学作用.然而,目前建立的非饱和土本构模型多是基于毛细机理提出的,忽略了后者对土体力学和水力行为的贡献.对于膨胀性非饱和土而言,固-液相间的物理-化学作用显著,并且致使土体具有复杂的行为特征.为了能够对膨胀性非饱和土的力学和水力行为进行全面、合理地解释和描述,本文建立了1个适用于膨胀性非饱和土的二元介质模型.首先,文中将膨胀性非饱和土抽象为由2个理想部分即理想毛细部分和理想黏吸部分组成,并且针对两者分别建立了理想模型.其次,利用参与函数反映土中2种理想部分所占的比重,以此描述实际情况下土体的力学和水力行为的特征.最后,利用该模型对膨胀性非饱和土在压缩和控制吸力情况下的力学和水力行为进行预测.通过模型预测结果和已有的试验数据的对比可知:该模型能够较好地描述膨胀性非饱和土的行为.
The interaction between liquid and solid matrix in unsaturated soils can be divided into capillary and physico-chemical processes depending on their formation mechanism. However, most of the constitutive models for unsaturated soils currently established are based on the capillary mechanism , Ignoring the contribution of the latter to soil mechanics and hydraulic behavior. For expansive unsaturated soils, the physico-chemical interactions between solid and liquid phases are significant and result in complex behavioral characteristics of the soil. A comprehensive and reasonable explanation and description of the mechanics and hydraulic behavior of expansive unsaturated soils, a binary medium model suitable for expansive unsaturated soils is established in this paper.Firstly, the expansive unsaturated soils are abstracted from 2 The ideal part is composed of the ideal capillary part and the ideal sticky part, and an ideal model is established for each respectively.Secondly, the participation function is used to reflect the proportion of the two ideal parts in the soil, Mechanics and hydraulic behavior.Finally, the model is used to predict the mechanical and hydraulic behaviors of expansive unsaturated soils under the condition of compression and control of suction.According to the results of model prediction and Some experimental data show that this model can describe the behavior of expansive unsaturated soils well.