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非饱和膨胀土的弹塑性本构模型研究
引用本文:曹雪山.非饱和膨胀土的弹塑性本构模型研究[J].岩土工程学报,2005,27(7):832-836.
作者姓名:曹雪山
作者单位:河海大学交通学院 江苏南京210098;
摘    要:Alonso(1999)提出的膨胀土模型存在着微观结构参数难以确定的缺点。本文在阐述膨胀土干湿循环试验后,对膨胀土的结构特征进行了分析,并研究了膨胀土的微观变形机理。认为膨胀土宏观上的胀缩塑性变形是由两部分塑性变形组成,一部分是微观结构层次中集聚体胀缩变形耦合后形成的微-宏观结构耦合变形,另一部分是宏观结构塑性变形。由此,本文改进了膨胀土模型,利用宏观结构层次的参数和微-宏观结构变形耦合参数t计算前部分变形,而后部分变形仍按低塑性非饱和土的弹塑性变形计算。最后通过计算实例表明:模型的结论与试验相近。

关 键 词:非饱和膨胀土  微&mdash  宏观结构耦合变形  改进膨胀土模型  弹塑性本构模型  
文章编号:1000-4548(2008)08-0832-05

Elastoplastic constitutive model of unsaturated expansive soils
CAO Xue-shan.Elastoplastic constitutive model of unsaturated expansive soils[J].Chinese Journal of Geotechnical Engineering,2005,27(7):832-836.
Authors:CAO Xue-shan
Affiliation:Hohai University Nanjing 210098 China
Abstract:The microstructure parameter of the expansive soil model, proposed by Alonso in 1999, is difficulty to test. After describing the expansive soil test under cyclic drying and wetting, the structure characteristics of expansive soil were analysed, and the mechanism of microstructure behavior of expansive soil was studied. The conclusion is that the strain observable at the macroscopic scale can be divided into two parts: one part is the coupled micro-and macro-structure strain, which comes from the swelling-shrinkage strain of particle assemblage at the microscope; the other is macrostructure plastic strain. Therefore, the expansive model was modified. In the modified expansive model, the former strain was calculated by macrostructure parameters and t, a micro-and macro-structure coupled parameter. The latter strain equaled to the elasto-plastic strain of low plastic unsaturated soils. Finally, an example indicates that the calculated result of the model is similar to that obtained from expansive soil test.
Keywords:unsaturated soils  micro-and macro-structure coupled strain  modified expansive model  an elastoplastic constitutive model  
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