弹塑性耦合应变定义与本构方程
Elastoplastic coupling strain definition and constitutive function
摘要
Abstract
Rock is characterised as the elastoplastic coupling,which means its elastic parameters change with the variation of plastic deformation beyond the threshold of yield.Based on current classification,definition and constitutive function of strain,the following work was conducted under the framework of elastoplastic coupling.Firstly,through compressive tests,the evolution of elastic parameters was analysed from the aspects of the damage and plastic deformation.The strain was mainly studied under the condition of loading incremental step.It was suggested that the strain increment corresponding to the loading increment could be decomposed into elastic strain increment dεe,elastic strain increment dεc and plastic strain increment dεp respectively.Furthermore,dεe was following the generalised Hooke's law,while dεc was against Hooke's law.The elastic relationship was constituted with elastic parameters after loading incremental step.Constitutive functions were then formulated in strain and stress spaces under loading,neutral loading and unloading conditions,respectively.The discussion was made on the internal variable increment reflecting the microstructure change.In general,the classification and definition of strain are explicit in concept and suitable for strain hardening and softening sections.Moreover,the elastoplastic coupling constitutive function considers the influences of different loading conditions on the changing rates of elastic parameters.Overall,the strain definition and constitutive function are in accordance with rock elastoplastic coupling characters.关键词
弹塑性耦合/本构方程/弹性参数/应变Key words
elastoplastic coupling/constitutive function/elastic parameter/strain分类
建筑与水利引用本文复制引用
李震,周辉,杨凡杰,赵洪波,茹忠亮..弹塑性耦合应变定义与本构方程[J].岩土力学,2018,39(3):917-925,9.基金项目
国家重点基础研究发展计划(973)项目(No.2014CB046902) （973）
中国科学院科技创新“交叉与合作团队”(人教字[2012] 119号) （人教字[2012] 119号）
中国科学院知识创新工程重要方向项目(No.KZCX2-EW-QN115) （No.KZCX2-EW-QN115）
国家自然科学基金项目(No.51404240,No.51427803,No.51704097) （No.51404240,No.51427803,No.51704097）
河南省教育厅高等学校重点科研项目(No.16A560004),河南省高校科技创新团队(No.15IRTSTHN029).This work was supported by the National Basic Research Program of China (2014CB046902),the Innovative Research Team of the Chinese Academy of Sciences ((2012)119),the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-EW-QN115),the National Natural Science Foundation of China (51404240,51427803,51704097),the Key Scientific Research Project of Institutions of Henan Higher Education (16A560004) and the Innovative Research Team in University of Henan Province (15IRTSTHN029). （No.16A560004）
