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“改进西元模型”是由西元体和村山体串联组成,它包含了黏弹性、黏塑性、黏弹塑性三种基本流变力学性态。本文基于统一流变力学模型理论,结合所得“改进西元模型”的性质及蠕变曲线的特征,对蠕变本构方程进行辨识,获得了西安地区地裂缝带Q_3原状黄土在不同应力水平下的一维蠕变本构方程。考虑到室内试验及实际工程问题均为三维状态,将一维本构模型进行推广,得到了三维蠕变模型,并对其本构方程进行求解。结果表明,所选本构方程较为准确地反映了西安地区地裂缝带Q_3原状黄土的流变性能。
“Improve the model of the Western yuan ” is composed of the West yuan body and village mountain series, which contains three basic rheological properties of viscoelasticity, viscoplasticity, viscoelasticity and plasticity. Based on the unified theory of rheological mechanics and the characteristics of creep curve and the properties of creep curve, the creep constitutive equations are identified, and the results show that the Q_3 undisturbed loess in the ground fissure zone of Xi’an area has good compressive strength under different stress levels Under the one-dimensional creep constitutive equation. Considering that both the indoor experiment and the actual engineering problems are three-dimensional state, the one-dimensional constitutive model is generalized and the three-dimensional creep model is obtained, and its constitutive equation is solved. The results show that the selected constitutive equation accurately reflects the rheological properties of Q_3 undisturbed loess in the ground fissure zone of Xi’an.