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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第3期    总第47期    2012年6月

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文章编号:1672-7029( 2012) 03-0112-05
广义摩尔库仑模型及其在FLAC3D 中的实现
乐家根,曹平,蒲成志,汪亦显

(中南大学资源和安全工程学院,湖南长沙410083)

摘 要: 为了进一步研究材料的本构模型,并对岩土工程中本构模型的研究提供参考,基于摩尔库仑理论关于材料塑性屈服是因为在某截面上的剪应力超过一定值的假设,进行三维应力状态下塑性屈服准则以及流动法则的推导,得出三向应力状态下的本构模型。利用FLAC3D 的二次开发接口,通过Visual Studio2008 将推导出的本构模型写成一个动态链接库文件.dll,并导入FLAC3D。结合1 个算例将开发出的模型同经典摩尔库仑模型进行比较。研究结果表明: 推导出来的广义摩尔库仑模型在应力加载过程中,在三维斜截面上先于经典摩尔库仑模型产生塑性屈服,即剪应力在三维斜截面上超过了屈服极限强度。

 

关键字: 本构模型; 广义摩尔库仑; FLAC3D; 剪切屈服准则; 二次开发

The realization of Generalized Mohr-Coulomb model in FLAC3D
YUE Jia-gen,CAO Ping,PU Cheng-zhi,WANG Yi-xian

School of Resources and Safety Engineering,Central South University,Changsha 410083,China

Abstract:In order to further study the material constitutive model and provide a reference for the study of cons-titutive model of geotechnical engineering,based on the assumption that the material plastical yield in Mohr is caused by excess shear stress,the plastic yield criterion and flow rule in three-dimensional stress state was deduced,and the three-dimensional consititutive model was obtained.Using the interface of secondary development in FLAC3D,the deduced model was written into a file of dynamic link library file through Visual Studio 2008 and was imported into FLAC3D.A numerical example was provided for comparison with the classical Mohr Coulomb model.The results show that the generalized Mohr-Coulomb model derived does generate plastic yield in three-dimension oblique section before classical Mohr-Coulomb model.That means shear stress exceeds the yield limit strength on the three-dimensional oblique section.This article can be provided a reference for the research of secondary development in FLAC3D.

 

Key words: constitutive models; generalized Mohr-Coulomb; FLAC3D; the shear yield criterion; secondary development

ISSN 1672-7029
CN 43-1423/U

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