| 邓肯-张模型和沈珠江双屈服面模型的改进 |
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| 引用本文： | 罗刚,张建民.邓肯-张模型和沈珠江双屈服面模型的改进[J].岩土力学,2004,25(6):887-890. |
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| 作者姓名： | 罗刚 张建民 |
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| 作者单位： | 清华大学,水利水电工程系岩土工程研究所,北京,100084 |
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| 摘 要： | 邓肯-张非线性弹性模型和沈珠江双屈服面弹塑性模型已经被广泛地应用于高土石坝等土工建筑物应力位移分析中，但是邓肯-张模型存在不能反映土剪胀性的缺陷，沈珠江模型在高围压或较大剪应变条件下也存在模拟土剪胀性偏大的不足。笔者提出了一个能够统一模拟低围压到高围压条件下土剪胀特性的数学表达式，对上述两个模型进行了改进。采用粗粒土的大型三轴试验结果的初步验证分析表明，改进模型能较好地拟合粗粒土在低围压条件下剪胀以及高围压条件下剪缩的应-应变特性。
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| 关 键 词： | 粗粒土 本构模型 剪胀 剪缩 |
| 文章编号： | 1000-7598-(2004)06-0887-04 |
| 修稿时间： | 2003年4月13日 |
Improvement of Duncan-Chang nonlinear model and Shen Zhujiang's elastoplastic model for granular soils |
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| LUO Gang,ZHANG Jian-min.Improvement of Duncan-Chang nonlinear model and Shen Zhujiang''''s elastoplastic model for granular soils[J].Rock and Soil Mechanics,2004,25(6):887-890. |
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| Authors: | LUO Gang ZHANG Jian-min |
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| Abstract: | Duncan-Chang model and Shen Zhujiang's elastoplastic model have been widely used to carry out stress-displacement analysis of high earth dams and other earthen structures. But the former cannot represent dilatancy and the latter overestimates it. Based on these two models, a new model which can simulate the dilatancy in a wide range of confining pressure is developed. The good performances of this model in predicting results of triaxial tests suggested its ability of simulating the stress-strain characteristics of granular soils, that is dilating under high confining pressure and contracting under low confining pressure when subjected to shear loadings, and the validity of this model is verified. |
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| Keywords: | granular soil constitutive model dilatancy shearing contraction |
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