岩土工程学报2017，Vol.39Issue(6)：1048-1057,10.DOI:10.11779/CJGE201706010
循环荷载下岩体结构面本构关系与积分算法研究
Constitutive relation and integration algorithm for rock discontinuities under cyclic loading
摘要
Abstract
The discontinuities distributed in underground structures are the important factors that affect the mechanical characteristics of rock mass,and to study the mechanical behavior of rock discontinuities under cyclic loading is of great engineering significance.In light of the non-associated plastic theory,defining the dilatancy and reduction zones,a constitutive model for rock discontinuities considering the coupling of dilatancy and plasticity is established.Starting from the basic damage mechanism,with regard to the separation of tension and shear,a new damage constitutive model based on the energy theory is proposed.In which the tension and shear plastic Helmholtz free energy and damage energy release rotes are determined by using the basic principle of plastic mechanics in the effective stress space,and the tension and shear damage failure criteria for rock discontinuities are proposed.Aiming at the strong nonlinear performance of rock discontinuities under cyclic loading,the operator decomposition method is introduced.The coupling process of dilatancy and plasticity,as well as the damage evolution process,is solved separately,and a mixed integration algorithm for the elastoplastic damage constitutive relation of rock discontinuities is put forward.Some experiments of direct shear and cyclic shear are simulated respectively,and the agreements between the simulated results and the experimental data indicate that the proposed model is reasonable and effective to simulate the complex deformation of discontinuous rock mass.关键词
岩体结构面/剪胀/弹塑性损伤/Helmholtz自由能/本构模型/积分算法Key words
rock discontinuity/dilatancy/elastoplastic damage/Helmholtz free energy/constitutive model/integration algorithm分类
建筑与水利引用本文复制引用
邓建,肖明,谢冰冰,陈俊涛..循环荷载下岩体结构面本构关系与积分算法研究[J].岩土工程学报,2017,39(6):1048-1057,10.基金项目
国家自然科学基金项目(51279136,51579191) （51279136,51579191）
国家重点基础研究发展计划(“973”计划)项目(2015CB057904) （“973”计划）
