基于ABAQUS的弹脆塑性本构模型二次开发及其应用  

Secondary Development of Elastic-Brittle-Plastic Constitutive Model and Its Application Based on ABAQUS

作　　者：刘明[1] 章青[1] 刘仲秋[2] 

机构地区：[1]河海大学工程力学系,江苏南京210098 [2]山东农业大学水利土木工程学院,山东泰安271018

出　　处：《红水河》2010年第1期47-51,共5页Hongshui River

基　　金：国家自然科学基金重点项目(No.50539090)

摘　　要：在复杂应力状态下,大理岩、花岗岩等脆性岩石呈弹脆塑性破坏形式。利用ABAQUS提供的用户材料子程序UMAT的二次开发平台,编制完成了基于D-P准则的弹脆塑性模型的UMAT接口程序。论文简要介绍了ABAQUS有限元软件及其UMAT用户材料子程序,重点对基于D-P屈服准则的弹脆塑性本构模型的应力跌落公式进行了推导,并讨论了有关的应力更新算法。最后应用该程序对某引水隧洞工程进行了数值分析,并与理想弹塑性情况下的计算结果进行对比研究。结果表明:与理想弹塑性模型相比,弹脆塑性模型得到的洞周围岩变形和塑性区范围较大,与实际情况更为接近。Marble and granite are brittle under complex stress conditions. Using the user material subroutine UMAT provided by the general software ABAQUS, the ideal elasto-brittle-plaltic constitutive model based on Drucker-Prager yield criterion is completed. After brief account of ABAQUS and its UMAT subroutine, the stress dropping formula of the model is derived in detail, and the algorithm for updating the stress is also discussed. Then the model is used to analyze excavation of a diversion tunnel, and results show that compared with ideal elasto-plaltic model the elasto-brittle-plaltic model has a larger deformation and a bigger plastic area in the wall rock, which is closer to actual situation.

关 键 词：弹脆塑性本构模型 D—P准则 UMAT子程序 围岩稳定 

分 类 号：TV223.3[水利工程—水工结构工程]