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黄土的结构性是除粒度、密度、湿度之外更为重要的指标。通过总结分析综合结构势理论框架内业已提出的结构性参数及其演化规律,并将结构性参数分为过程结构性参数和初始结构性参数两类,这种分类说明了合理的结构性参数既要反映土的基本物理属性还要反映其在外部扰动作用下的演化过程。针对目前结构性参数及其演化规律存在的问题,采用能够反映初始结构性的构度指标与反映过程结构性的应力比结构性参数,提出了球应力与剪应力对结构性参数综合影响的综合应变,并分析综合应变与结构性参数之间的关系,建立了一个能反映结构性从初始到湿载作用下衰减演化的数学模型。通过理论分析和常规三轴试验研究表明,该数学模型避免了试验围压对初始结构性的影响,并且考虑了湿载过程中体应变与剪应变的共同影响,更加准确地反映黄土的结构损伤演化规律。
Loess structure is in addition to particle size, density, humidity, more important indicator. By summarizing and analyzing the structural parameters and their evolutional laws that have been proposed in the framework of the comprehensive structural potential theory, the structural parameters are divided into two types: process structural parameters and initial structural parameters. This classification shows that reasonable structural parameters are both To reflect the basic physical properties of soil also reflect its evolution under the influence of external disturbances. Aiming at the existing problems of structural parameters and their evolution law, the structural parameters reflecting the initial structural properties and the structural parameters of the stress ratio are used to describe the comprehensive effects of the ball stress and the shear stress on the structural parameters Strain and analyze the relationship between the integrated strain and the structural parameters, a mathematical model that reflects the evolution of attenuation under the structural load from initial to wet load is established. Theoretical analysis and conventional triaxial tests show that this mathematical model avoids the influence of confining pressure on the initial structural properties and considers the combined effect of body strain and shear strain during wet loading to more accurately reflect the structural damage of loess Evolutionary law.