This paper investigates the triaxial compression behaviour of Q3 loess soil and the construction of a constitutive model accounting for the structural effect of loess on the basis of the disturbed state concept. By analyzing the triaxial compression testing results, we have established a new disturbing function with respect to the volumetric and shear moduli parameters. A research into the evolution laws of the disturbing function was also conducted, followed by the construction of a constitutive model for loess soil as well as the verification of the constitutive model with model test results. The results indicate that the double-parameter disturbing function evolves in an exponential form, capturing well the effect of moisture content and confining pressure on the loess structural behavior. The parameters of the constructed constitutive model based on the disturbed state are easy to be obtained and have clarified physical meanings. Considering the effectiveness in capturing the structural behavior of the loess, the constructed constitutive model has a great potential to be applied in the engineering practice in the loess area. The constructed constitutive model based on the disturbed state concept provides new ideas for the study of the structural constitutive model of loess, which is theoretically significant.

中文翻译：

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黄土三轴压缩特性的扰动状态模型

本文以扰动状态概念为基础，研究了Q3黄土的三轴压缩特性，建立了考虑黄土结构效应的本构模型。通过分析三轴压缩测试结果，我们针对体积和剪切模量参数建立了新的扰动函数。还研究了扰动函数的演化规律，然后建立了黄土的本构模型，并用模型试验结果验证了本构模型。结果表明，双参数扰动函数以指数形式演化，很好地捕获了水分含量和围压对黄土结构行为的影响。基于扰动状态构造的本构模型的参数易于获得，并具有明确的物理意义。考虑到捕获黄土结构行为的有效性，所建立的本构模型在黄土地区的工程实践中具有很大的潜力。基于扰动状态概念的构造本构模型为黄土结构本构模型的研究提供了新的思路，具有重要的理论意义。