[参考文献] References
[1]
黄文熙.土的工程性质[M].北京:水利电力出版社,1981.
等向压缩时的硬化参数由等向压缩的加卸载试验确定出,任一围压时的硬化参数h0=dWp,其中,Wp为塑性功,d为参数。而后通过对其线性回归得出。对永定河砂有参数d=94.5。
HuangWenxi.EngineeringPropertiesofSoil[M].Beijing:ChineseHydraulicandHydropowerPublishing,1981.(inChinese)
[2]郭瑞平.土应变软化性状的弹塑性模拟[D].北京:
清华大学,1998.
Guouiping.EModelingofStrain2ofor[D].Beijing:TUniversity,inese)
.[D].北
3 采用本模型用增量法分析三轴试验
结果
3
图2与图3分别为对干密度为1.81g cm永定河砂的三轴试验预测的应力应变关系[2]轴向应变与体应变的关系曲线图[3]
1982.
Yaping.DeterminationofParametersofElasto2plasticModelofSoil[D].Beijing:TsinghuaUniversity,1985.(inChinese)
曲线,本模型所,而且
。
Elasto-plasticmodelofsoilwithafunctionofplasticworkasthe
hardeningfunction
GUORuiping,LIGuangxin
(DepartmentofHydraulicandHydropowerEngineering
TsinghuaUniversity,Beijing100084,China)
Abstract:InviewofthedifficultyofdeterminingtheparameterofTsinghuaElasto2plasticModelproposedbyHuangWenxi,aelasto2plasticmodelwithafunctionofplasticworkasthehardeningfunctionandthemethodwhichisusedtodeterminetheparameterofthemodifiedmodelwereproposedinthispaper.Theparametersofthismodelrequiredtocharacterizethesoilbehaviorcanbederivedentirelyfromresultsofisotropiccompressionandconventionaltriaxialcompressiontests,butthemodelisapplicabletogeneral32Dstressconditions.Thecomparisonbetweenthemeasuredandpredictedstress2strainandvolumechangebehaviorforYongdingRiversandshowsthatthemodelpredictssoilbehavior2shearcompressionanddilationwithgoodaccuracy.Keywords:constitutivemodelof
dilation
soil;
plasticwork;
图2
应力应变预测结果与试验结果的对比
图3 体应变与轴向应变的预测值与试验值对比
4 小 结
原有清华模型的硬化参数是塑性体应变和塑性