黄土湿陷变形本构关系研究  

Study of constitutive law for collapsible deformation of loess

作　　者：周凤玺[1] 米海珍[1] 胡燕妮[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2005年第4期116-119,共4页Journal of Lanzhou University of Technology

摘　　要：根据黄土湿陷变形的结构性原理,分析了湿陷变形的塑性特性,引用增湿软化模型ZSM体作为增湿变形的力学模型,应用常规三轴浸水试验研究了不同的应力状态下湿陷性黄土在水和力共同作用下的湿陷变形特性.将增湿含水量作为内应力考虑,并由试验拟合得出湿陷体积屈服面和剪切屈服面.基于广义塑性力学原理建立了湿陷变形的增量本构模型.该模型考虑了湿陷变形中的湿陷体积变形和湿陷剪切变形以及球应力和偏应力对湿陷体积变形和湿陷剪切变形的交叉影响,反映了黄土湿陷变形的特性.According to structural theory of collapsible loess, the plastic property of collapsible deformation was analyzed and the ZSM structure was quoted as the mechanical model of collapsible deformation. The properties of collapsible deformation of loess under the coordinate action of force and water were studied by applying conventional triaxial immersion tests in different stress states. The moisture content of increasing dampness was regarded as an internal stress, and the yielding surface of collapsible volume and the shear yielding surface were obtained through curve fitting of test data. In addition,the stress-strain model for collapsible deformation was established based on the generalized plastic mechanics. The model took account of volume deformation, shear deformation in the collapsible deformation,and the coupled influence of spherical stress and deviator stress on the volume deformation and shear deformation, revealing the mechanism and property of collapsible deformation.

关 键 词：湿陷性黄土 增湿变形 广义塑性力学 本构关系 

分 类 号：TU431[建筑科学—岩土工程]