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针对结构性土的固结不排水剪性状,提出一种基于扰动状态概念的描述方法。通过三轴固结不排水剪试验,分析了结构性土固结不排水剪切过程中的剪应力、孔隙水压力与轴向应变的关系特点。根据扰动状态概念的原理,采用邓肯-张的非线性弹性模型描述相对完整状态的应力-应变关系,用孔隙水压力作为参量定义了一个新的扰动函数,构建了一种描述结构性土固结不排水剪性状的本构关系。经验证,模型计算结果与试验数据吻合较好,可统一描述应变软化型和应变硬化型应力-应变关系。
Aiming at the consolidation undrained shear characteristics of structural soil, a description method based on the concept of disturbance state is proposed. Through the triaxial consolidation undrained shear test, the relationship between shear stress, pore water pressure and axial strain during the undrained shear of structural soil consolidation was analyzed. According to the principle of disturbance state concept, Duncan-Zhang nonlinear elastic model is used to describe the stress-strain relationship of relatively intact state. A new disturbance function is defined by using pore water pressure as a parameter. A new method of describing soil- Undrained scissors trait constitutive relationship. It is verified that the calculated results agree well with the experimental data, and the stress-strain relationship between strain softening and strain hardening can be described uniformly.