摘要
在Carter流变模型基础上,引进损伤,提出了“损伤增速界限”的概念,从而,建立了一种盐岩流变损伤模型,并根据实验数据验证了模型的正确性。研究表明,这种盐岩流变损伤模型,不但能很好地反映高应力水平下盐岩的流变损伤特性,而且,也能真实地描述低应力水平下盐岩的初始蠕变损伤和稳态蠕变损伤。 损伤增速界限对损伤演化和蠕变发展影响很大,关系着加速蠕变的发生与否。研究还表明,不同产地、不同实验条件下表述盐岩损伤的参数离散性不大,该模型的应用范围较广。
A constitutive creep-damage model for salt rock, established by means of application of damage and a concept of 揹amage accelerating limit?into Carter抯 creep model, is presented. Based on the creep tests for salt rock evaluation of the model is made. The results show that the constitutive model can not only give a faithful representation of the creep-damage characters for salt rock under high stress, but also describe efficiently the primary and stationary creep at low loading level. The damage accelerating limit, beyond which the tertiary creep will occur, influences strongly the damage development and creep. Furthermore, no great variation of the parameters describing creep-damage by variant sorts of salt rock and by different test conditions was found. Therefore, the model can be widely used.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2003年第S2期81-84,共2页
Rock and Soil Mechanics
基金
教育部留学回国人员科研启动基金资助项目(编号:2002-247)。
关键词
盐岩
流变损伤
模型
salt rock
creep-damage
constitutive model
