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为了研究结构性软黏土一维压缩变形特性的影响,在软黏土一维压缩结构破坏特征的基础上,揭示了压缩指数随孔隙比的变化规律,提出了土体结构渐进破坏的数学描述模式;基于上述描述模式,首先推导了一维压缩曲线的数学表达式,分析了结构效应参数对压缩曲线性状的影响规律;然后利用10种典型结构性软黏土的一维压缩试验结果对数学描述模式进行了验证,并以Mexico City clay为例,将描述模式和其他6种常用描述模式的模拟效果进了对比分析;最后分析了软黏土结构效应参数随(w-wP)的变化规律,通过线性回归得出了结构效应参数的经验关系式。研究结果表明提出的描述模式能较准确地描述一维条件下结构性软黏土的压缩变形的结构破坏特征。成果为建立结构性软黏土的本构模型提供了一定的理论基础,也为进一步研究结构性软黏土的变形特性提出了新的思路。
In order to study the effect of one-dimensional compressive deformation of structural soft clay, a mathematical description model of asymptotic deterioration of soil structure was proposed based on the failure characteristics of one-dimensional compression structure of soft clay. Based on the above description mode, the mathematical expression of the one-dimensional compression curve is derived and the influence law of the structural effect parameter on the compression curve property is analyzed. Then, the mathematical description mode is carried out by using the one-dimensional compression test results of 10 typical structural soft clay Finally, the variation regularity of structural parameters of soft clay with (w-wP) is analyzed. By linear regression The empirical relationship of structural effect parameters is obtained. The results show that the proposed model can accurately describe the structural failure characteristics of structural soft clay under compressive deformation under one-dimensional conditions. The results provide a theoretical basis for establishing the constitutive model of structural soft clay and also provide a new idea for further studying the deformation characteristics of structural soft clay.