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对原状西安黄土进行三轴流变试验,系统分析黄土在不同含水率和不同压应力状态下的流变特性。考虑到天然黄土不等向固结历史的影响,试验土样在进行三轴流变试验前均先进行K0固结至原位应力状态。研究表明:对于K0固结黄土,加载初期黄土具有一瞬时变形,当应力值固定时,流变变形后期衰减趋于稳定。在较高的应力作用下,加载初期出现加速流变现象;不同含水率下,流变曲线变形趋势相似,变形幅度与含水率正相关;在不同应力与含水率下,黄土流变均呈现出两阶段变形。基于此,建立了三轴条件下不同含水率的黄土非线性流变本构模型。
Triaxial rheological tests were carried out on the original Xi’an Loess Plateau to systematically analyze the rheological properties of loess under different water contents and different compressive stresses. Considering the influence of natural loess unequal consolidation history, the test soil samples were first subjected to K0 consolidation to the in-situ stress state before the triaxial rheological tests. The results show that for the Loess Loess K0, the loess has a transient deformation at the initial stage of loading, and the attenuation tends to be stable at the late stage of the deformation when the stress is constant. Under the condition of higher stress, the accelerating rheology appears at the initial stage of loading. The deformation trend of rheological curves is similar under different water contents, and the deformation amplitude is positively correlated with water content. Under different stress and moisture content, Two-stage deformation. Based on this, the nonlinear rheological constitutive model of loess with different moisture contents under three axis conditions is established.