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,但足邓肯-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力-应变特性。
Duncan-Chang model and Shen Zhujiang's elastoplastic model are 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 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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第6期887-890,共4页
Rock and Soil Mechanics
关键词
粗粒土
本构模型
剪胀
剪缩
Dams
Mathematical models
Shear deformation
Stress analysis
