沥青砂非线性流变模型实验研究  

Experimental Research on Nonlinear Rheological Model of Asphalt Sand

作　　者：叶永[1,2] 陈燕飞[1] 

机构地区：[1]三峡大学土木水电学院,湖北宜昌443003 [2]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（城市科学版）》2009年第1期57-59,69,共4页Journal of Huazhong University of Science and Technology

基　　金：国家自然科学基金(10672063)

摘　　要：构建一个描述粘塑性变形的组合体,引入非线性粘滞阻尼器,假定阻尼器所受应力与蠕变加速度成正比,在Burgers模型中串联该组合体,得到一个能够完整描述沥青砂三个蠕变过程的非线性流变模型,理论推导和分析了该模型蠕变本构方程。进行了沥青砂试件在40℃、不同应力水平下单轴压缩蠕变试验,编制非线性拟合程序求得该模型参数,并得到模型参数与加载应力的函数关系。为验证模型有效性,本文模型预测与Bur-gers模型预测及实验结果进行对比,结果表明,本文模型与实验结果吻合更好,完整反映了沥青砂三个蠕变阶段变形特征。An element describing viscoplastic deformation was presented in this paper, by introducing a non- linear viscous dashpot which its stress is proportion to creep acceleration. Burgers model, which often describes the first two creep stages, was extended to a non-linear rheological model by combining with the element in series. In order to determine the non-linear model parameters, uniaxial compression tests were performed at 40℃ under the controlled-stress mode with different stress amplitudes（0.1,0.15,0.2,0.25,0.3 MPa）. The model creep representation was deduced for the uniaxial loading condition and the model parameters were attained by a nonlinear fitting program. Comparison between the proposed model and Burgers model prediction with experimental results show that the model successfully describes the total deformation behavior of asphalt sand mixture and has a better agreement with the experimental results.

关 键 词：沥青砂 非线性流变模型 蠕变实验 BURGERS模型 粘滞阻尼器 

分 类 号：U414.7[交通运输工程—道路与铁道工程] O37[理学—流体力学]