关键词: 胶结土, 沉降变形, 本构模型, 应变局部化

Abstract: With the continuous construction of infrastructure, more and more underground engineering and geotechnical engineering related projects, the increasing problems encountered in the construction process, the problem of large deformation and the failure of soil are commonly encountered. Only by theoretically explaining the mechanism of the strain localization of the failure process of geotechnical samples be reproduced and solved. In this paper, the finite element software by using the constitutive model of the cemented soil is used to explore the effects of dilatancy softening, the cementation damage softening and the boundary constraints on the strain localization deformation. The study indicates that: (1) The density of the soil plays a key role in the dilatancy softening characteristics of the sand. At the same time, the dilatancy softening produces strain localization, and X-shaped shear band changes in the interior of the sample. (2) The initial cementation force is added to soften the cementation structure based on the original dilatancy softening, which makes the peak strength of the soil gradually increase. The cementation damage coefficient determines the speed of cementation force loss and affects the peak value of soil, but the softening of the cementation damage does not change the volume strain trend of soil. (3) The end constraint will affect the distribution of strain localization, but it has nothing to do with the occurrence of strain localization.

Key words: Cemented Soil, Deformation, Constitutive Model, Strain Localization