Drucker-Prager准则参数特性分析  

STUDY ON PARAMETRIC CHARACTERS OF DRUCKER-PRAGER CRITERION

作　　者：刘金龙[1] 栾茂田[1] 许成顺[2] 王吉利[1] 袁凡凡[1] 

机构地区：[1]中国科学院武汉岩土力学研究所,湖北武汉430071 [2]大连理工大学土木水利学院,辽宁大连116024

出　　处：《岩石力学与工程学报》2006年第z2期4009-4015,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国科学院武汉岩土力学研究所领域前沿基础研究基金资助项目(Q110305)

摘　　要：Drucker-Prager准则在数值计算中得到广泛运用。但如果该准则的参数选取不当,可能导致预测与试验结果之间不一致。通过分析函数基本特性,考察该准则反映中主应力对强度参数影响的能力,探讨导致预测与试验结果之间不一致的可能原因。进而对目前常用的参数表达式进行详细的分析,并考察平面应变情况下Drucker-Prager准则的参数特性。分析表明:Drucker-Prager准则不能合理地反映中主应力对强度参数的影响,且在平面应变情况下会得出中主应力系数小于0的结论。Drucker-Prager criterion has been widely used in geotechnical engineering.However,in some cases,the numerical result with Drucker-Prager criterion will be not consistent with the testing result,especially when the parameters are not selected appropriately from tests.In this paper,the parametric characters of Drucker-Prager criterion are analyzed with mathematic methods.Some possible reasons leading to the inconsistentness are studied.Moreover,based on the Drucker-Prager criterion,the strength parameters of different intermediate principal stresses are generally compared.It is demonstrated that the intermediate principal stresses′ effects can not be reasonably reflected with those parameters to a certain degree.Furthermore,an unreasonable result that the coefficient of the intermediate principal stress is little than 0 is achieved under the condition of plane strain with the Drucker-Prager criterion.

关 键 词：岩土力学 DRUCKER-PRAGER准则 抗剪强度 中主应力 平面应变状态 

分 类 号：TU45[建筑科学—岩土工程]