沥青砂粘弹塑本构模型及其验证  

Viscoelastoplastic Constitutive Model of Asphalt Sand and Its Validation

作　　者：叶永[1,2] 邵瑾[1] 陈传尧[1] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430074 [2]三峡大学土木水电学院,宜昌443002

出　　处：《武汉理工大学学报》2009年第17期46-49,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(10672063)

摘　　要：将Burgers模型与粘塑性模型串联,得到能描述沥青砂3个蠕变阶段的粘弹塑本构模型。开展了40℃,不同应力水平下沥青砂单轴蠕变实验,通过非线性拟合确定了模型中材料参数。利用模型预测了沥青砂蠕变变形和应变率变化,并与实验结果和Burgers模型预测结果进行了比较。结果表明,该模型不仅能描述沥青砂蠕变过程的前2个阶段变形,而且能反映第3阶段的加速蠕变特征,且预测结果与实验相当吻合。By placing the Burgers and a viscoplastic model in series, a visco-elastoplastic model that can completely describe three-stage creep deformation behavior of asphalt sand is proposed. A series of uniaxial compression creep tests are performed under different stress levels at 40℃. A nonlinear fit program is put forward for determining model parameters. The resulting visco-elastoplastic model is successfully validated by comparing the predicted creep deformation and creep strain rates with the experimental and Burgers model results. These comparison results indicate that the model fairly describes the frontal two stages deformation behavior of creep course, moreover it can describe the acceleration creep characteristic of asphalt sand.

关 键 词：沥青砂 粘弹塑本构模型 蠕变实验 粘弹性 

分 类 号：U414[交通运输工程—道路与铁道工程] O34[理学—固体力学]