| 黏土的应力路径本构模型 |
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| 引用本文： | 路德春,姚仰平.黏土的应力路径本构模型[J].岩土力学,2007,28(4):649-654. |
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| 作者姓名： | 路德春 姚仰平 |
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| 作者单位： | 北京航空航天大学土木工程系,北京,100083 |
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| 摘 要： | 根据黏土应力-应变曲线的特点及其应力路径的相关特性，将作者所建立的砂土应力路径本构模型扩展用于黏土，建立了黏土的应力路径本构模型，利用变换应力方法将SMP准则用于黏土的应力路径本构模型，使模型得到了合理的三维化。黏土的应力路径模型与修正剑桥模型相比，在双向加载A区和卸载D区二者完全相同；在单向加载B区和F区，两种模型均可计算塑性应变；特别是在C区和E区，黏土的应力路径模型可计算塑性应变，而修正剑桥模型的塑性应变为0。通过与修正剑桥模型比较和对藤森黏土试验结果的预测，反映了黏土应力路径本构模型描述黏土在不同应力路径条件下应力．应变特性的优越性。
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| 关 键 词： | 砂土 黏土 应力路径 本构模型 修正剑桥模型 |
| 文章编号： | 1000-7598-（2007）04-0649-06 |
| 收稿时间： | 2005-05-25 |
| 修稿时间： | 2005-05-25 |
Constitutive model for clay considering complex stress paths |
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| LU De-chun,YAO Yang-ping.Constitutive model for clay considering complex stress paths[J].Rock and Soil Mechanics,2007,28(4):649-654. |
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| Authors: | LU De-chun YAO Yang-ping |
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| Institution: | Department of Civil Engineering，Beihang University，Beijing 100083, China |
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| Abstract: | According to the characteristics of stress-strain curve of clay and the relating characteristics of its stress path,a sand stress path constitutive model established by authors is extended to clay;thus a clay stress path constitutive model is proposed.Through the transformed stress method,the SMP criterion is applied to the clay stress path constitutive model;then the model can describe the general stress states reasonably.The clay stress path constitutive model is identical with the modified Cam-clay model when they are in the condition of bidirectional loading(area A) and unloading(area D);there are different methods for computing plastic strain in the condition of single-direction loading(area B and F);specially,in the area C and E,the clay stress path constitutive model can compute plastic strain which will be zero if the modified Cam-clay model is used.Compared with the prediction of the modified Cam-clay model on the test data of Fujinomori clay,the superiority of the clay stress path constitutive model is demonstrated when describing the characteristics of stress-strain of clay in the condition of different stress paths. |
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| Keywords: | sand clay stress path constitutive model modified Cam-clay model |
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