中文摘要：

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一应变关系，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。

英文摘要：

A new method to describe the behavior of consolidated-undrained compression of structured soils is presented based on the theory of disturbed state concept （DSC）. The characteristics for relationships between shear stress, axial strain and pore water pressure of structured soils are analyzed by triaxial consolidated-undrained shear tests in laboratory. According to the modeling method of disturbed state concept, a new constitutive model to describe consolidated-undrained shear behavior of structured soils is suggested, in which Danctm-Zhang nonlinear model is used to define the stress-strain behavior of soils in a relative intact state; and a new disturbance function is defined by taking pore water pressure as a parameter. The suggested model is verified by test data of two samples with different depths from the west area of Liaoning province; and the result shows that the model calculation is in a good agreement with test data. It can express the types of strain-softening and strain-hardening stress-strain relations.