To accurately predict the influence of osmotic suction on the mechanical behavior of overconsolidated saturated saline clay,an elastoplastic model considering the effect of osmotic suction is established to provide a theoretical basis for predicting the chemo-mechanical coupling behavior of saturated saline clay.Based on the theoretical foundation of the unified hardening(UH)model,the model is established to consider simultaneously the osmotic suction,degree of consolidation and chemo-mechanical coupling effect by introducing the osmotic efficiency parameter and coupling stress,as well as obtaining the theoretical expressions for the overconsolidation ratio and osmotic suction.From verification results,the new model has the following properties.(1)The effects of deformation softening and strength hardening induced by osmotic suction can be described with the help of the concept of coupled stresses.(2)The chemo-mechanical coupling behavior of saturated saline clay can be accurately predicted for different stress histories,drainage and saline conditions with the addition of only two parameters.(3)The relationship between the overconsolidation ratio of saturated saline clay and osmotic suction can be revealed,as well as the interaction mechanism of their chemo-mechanical coupling behavior.In addition,the results provide a valuable theoretical basis for the chemo-mechanical coupled analysis and behavior prediction of clay under chemical environment.
关键词
土力学/饱和盐渍黏土/超固结比/渗透吸力/化学-力学耦合/弹塑性模型
Key words
soil mechanics/saturated saline clay/OCR/osmotic suction/chemo-mechanical coupled behavior/UH model
维普
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