西北水电Issue(1)：87-93,7.DOI:10.3969/j.issn.1006-2610.2025.01.011
真三轴路径下双线性修正邓肯-张模型研究
Study on the Bilinear Modified Duncan-Chang Model under True Triaxial Paths
摘要
Abstract
The Duncan-Chang model is widely used due to the simplicity of parameter determination,but it is not applicable to the true triax-ial stress state with non-axisymmetric stress.In order to demonstrate the applicability of the Duncan-Chang model considering the influence of the intermediate principal stress under the true triaxial stress state,this paper proposes a bilinear modified Duncan-Chang model to adapt to the soil behavior under this stress state.True triaxial tests are carried out on soil samples from a construction site in Xi'an.The consolida-tion stresses are set as 50,100,and 150 kPa,and the ratios of the intermediate principal stress are 0,0.25,0.5,0.75,and 1.00 respective-ly.The results show that with the increase of the ratio of the intermediate principal stress,the tangent modulus of the soil increases,indica-ting that the intermediate principal stress has a significant influence on the shear deformation.The bilinear modified model established based on the data has high accuracy in predicting the remolded loess,undisturbed loess and strain-hardening remolded sand.The error of the mod-el prediction is inversely proportional to the magnitude of the consolidation stress and directly proportional to the ratio of the intermediate principal stress.This model provides an accurate and reliable theoretical support for engineering practice and numerical simulation,especially in predicting the soil behavior under the true triaxial stress state considering the influence of the intermediate principal stress.关键词
邓肯-张模型/真三轴试验/双线性修正/中主应力/应力-应变关系Key words
Duncan-Chang Model/True Triaxial Test/Bilinear Modification/Intermediate Principal Stress/Stress-strain Relationship分类
建筑与水利引用本文复制引用
辛葱葱,包磊,孙融融,王舒,高帅,尹炬尧,姚普静..真三轴路径下双线性修正邓肯-张模型研究[J].西北水电,2025,(1):87-93,7.基金项目
国家自然科学基金青年基金项目(42307108) （42307108）
中国电建集团西北勘测设计研究院有限公司科技项目(XBY-KJ-2024-59) （XBY-KJ-2024-59）
