以塑性功函数为硬化参数的土的弹塑性模型(2)

[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

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