单轴压缩条件下岩石细观力学参数特性数值研究  

Numerical Simulation of Micro Mechanical Parameters Properties of Rocks Under Uniaxial Compression

作　　者：艾涛 朱珍德[1,2] 田源[1,2] 朱端[1,2] Ai Tao;Zhu Zhende;Tian Yuan;Zhu Duan(Key Laboratory of Ministryof Education for Geomechanics&Embankment Engineering,Hohai Univ.,Nanjing 210098,China;Jiangsu Research Center for Geotechnical Engineeering Technology,Hohai Univ.,Nanjing 210098,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学江苏省岩土工程技术工程研究所,南京210098

出　　处：《三峡大学学报（自然科学版）》2019年第6期31-36,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学面上基金(51878249);江苏省自然科学面上基金项目(BK20161508)

摘　　要：基于ABAQUS提供的二次开发平台,建立数值试验模型研究了岩石中细观单元各主要力学参数与宏观响应的关系.模型采用Weibull分布来描述离散后岩石细观单元的力学性质参数,并应用Monte-Carlo方法编制程序进行单元力学参数的赋值.数值模拟结果表明:细观单元和宏观试样的弹性模量、强度之间具有良好的线性关系;岩石的宏观强度会随着细观单元的压拉比的降低而增大,其脆性则会随着单元均质度的增大而增加,而岩石宏观残余强度受细观单元残余强度影响很小.最后,通过岩石单轴压缩破坏过程的数值模拟与SEM试验结果对比,验证了数值模型的合理性.Based on the secondary development platform of ABAQUS,a numerical test model of rock was established to investigate the correlation between micro mechanical parameters and macro influences.The Weibull distribution was used to describe the mechanical properties of discrete micro element.The Monte-Carlo method was used in program to assign mechanical parameters to elements.The numerical simulation results show that the elasticity modulus and strength have a good linear relationship between the micro element and macro specimen.With the increase of element homogeneity,the brittleness of rock increases.Besides,the macro strength of rock increases with the decrease of splitting tensile strength of the micro element,and the residual strength of micro element has little effect on that of macro rock.Finally,the rationality of the numerical model is verified by the comparison between the results of numerical simulation and SEM test under uniaxial compression.

关 键 词：WEIBULL分布 MONTE-CARLO方法 岩石 单轴压缩 ABAQUS 

分 类 号：TU452[建筑科学—岩土工程]