考虑结构性的原状黄土应力-应变关系的探讨

土体的结构是其强度、变形的内在决定因素，黄土的结构性由黄土颗粒之间的联结结构强度和摩擦结构强度所决定。由此，提出了黄土静力结构性参数即联结结构静力强度势参数m? 1、摩擦结构静力强度势参数m? 2以及结构静力强度势参数m? 。这些结构性参数具有明确的物理意义，既能反映黄土的综合结构性，又能分别反映黄土联结结构性和摩擦结构性。分析了静三轴应力条件下黄土的应力-应变特性以及黄土静力结构性参数的变化规律，建立了考虑黄土结构性的原状黄土应力-应变关系式，从而可以由结构性最弱的饱和重塑黄土的应力-应变曲线，通过结构参数模拟得到考虑结构性的原状黄土的应力-应变关系曲线。利用考虑结构性的原状黄土应力-应变关系式可整理计算出原状黄土的强度指标c、初始切线模量Ei、破坏比Rf、应力水平S以及切线弹性模量Et等参数，可应用于静荷载作用下黄土应力-应变有限元分析计算。

Discussion on stress-strain relation of intact loess considering soil structure

Soil structure is an intrinsic determinant of its strength and deformation. The loess structure is determined by the link structural strength and the friction structural strength. Based on this, some new and reasonable structural parameters of loess are suggested based on soil static strength, such as the link structural static strength potential parameter m? 1, the friction structural static strength potential parameter m? 2 and the structural static strength potential parameter m?. These structural parameters have clear physical meaning, and can be used to reflect the comprehensive structure, the link structural and frictional structure of loess. The stress-strain behavior and the variation of the structural parameters of loess are studied under static triaxial stress conditions. The stress-strain formula of intact loess based on the structural parameters is provided. So we can simulate the stress-strain curve of intact loess by structure parameters and the stress-strain curve of saturated remolded loess which has the weakest structure. Some parameters such as strength index c, the value of the initial tangent modulus Ei, failure ratio Rf, stress level S and tangent modulus of elasticity Et can be worked out from the stress-strain formula of intact loess. These parameters can be used in finite element analysis of loess stress-strain under static loads.