脆塑性岩石破坏后区应力跌落效应数值模拟  

Numerical simulation on post failure stress-drop of brittle-plastic rock materials

作　　者：史贵才[1] 陈冠 刘勇 代国忠[1] Shi Guicai;Chen Guan;Liu Yong;Dai Guozhong(School of Civil Engineering and Architecture,Changzhou Institute of Technology,213032,Changzhou,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,430072,Wuhan,China)

机构地区：[1]常州工学院土木建筑工程学院,常州213032 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《应用力学学报》2020年第1期427-433,I0030,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51678083);江苏省高校优秀中青年教师和校长境外研修计划

摘　　要：采用三轴试验和数值模拟研究了岩石类脆塑性材料的应力跌落效应,并用塑性流动因子λ来描述应力跌落效应。为简化计算,给出了一种应力陡降过程中伴随的非零应变增量的工程近似处理方法,基于此针对性地编制了处理脆塑性材料应力跌落的有限元分析程序代码。数值模拟结果验证了塑性流动因子λ以及该近似处理方法的有效性。Uniaxial or triaxial compression test of cylindrical rock specimens using rock mechanics testing machine are basic experimental method to study the strength and deformation characteristics of rock and the development process of rock fracture.Extensive literature review has been conducted on this issue.Meanwhile,experimental and numerical studies have been conducted on the stress-drop effect on the brittleness of rock materials.A plastic flow factor is proposed to describe the stress-drop effect.For simplicity purposes,an engineering approximation approach has been proposed to evaluate the stress-drop with a non-zero strain increment.Numerical simulation results validate the effectiveness of the plastic flow factor as well as the engineering approximation approach.Based on the results in this study,finite element code can be programmed for brittle materials with stress-drop,which has the potential to be readily incorporated in finite element codes.

关 键 词：岩石材料 应力跌落效应 塑性流动因子 有限元分析程序 

分 类 号：TU452[建筑科学—岩土工程]