THEORETICAL ASPECTS OF CONSTITUTIVE MODELLING FOR UNSATURATED SOILS
THEORETICAL ASPECTS OF CONSTITUTIVE MODELLING FOR UNSATURATED SOILS
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DOI：
10.3208/sandf1972.33.4_49
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发表时间：
1993-12
影响因子：
3.7
通讯作者：
Y. Kohgo;M. Nakano;T. Miyazaki
中科院分区：
文献类型：
--
作者：
Y. Kohgo;M. Nakano;T. Miyazaki
摘要 本文讨论了制备非饱和土本构方程的几个理论问题。首先，描述可能的孔隙水状态。考虑了岛屿空气、模糊和摆动饱和三种状态来检查非饱和土的力学行为。澄清了每种状态的吸力效应，这些效应用于解释非饱和土的整体力学行为。吸力效果可分为两类。一种是吸力的增加导致有效应力的增加，另一种是吸力的增加导致屈服应力和土壤骨架抵抗塑性变形的刚度的增加。第一吸力效应可以通过制定临界状态湿侧吸力和剪切强度之间的关系来估计。第二吸力效应可以从状态面概念来估计。提出了具有这些吸力效应的修正 Cam 粘土模型。该模型的性能将在论文中进行检验（Kohgo 等人，1993）。
ABSTRACT In this paper, several theoretical aspects for preparation of constitutive equations of unsaturated soils are discussed. First, possible pore water states are described. Three states, insular air, fuzzy and pendular saturation are taken into account to examine the mechanical behavior of unsaturated soils. Suction effects are clarified for each state and these are used to interpret the overall mechanical behavior of unsaturated soils. The suction effects can be classified into two categories. One is that an increase in suction induces an increase in effective stresses and the other is that an increase in suction induces an increase in both yield stress and the stiffness of the soil skeleton against plastic deformations. The first suction effect can be estimated by formulating the relationship between suction and shear strength at the wet side of critical state. The second suction effect can be estimated from the state surface concept. The modified Cam clay model with these suction effects is proposed. The performance of this model will be examined in the paper (Kohgo et al., 1993).