摘要
进行了沥青砂试样在40℃温度,不同应力水平(0.1 MPa、0.15 MPa、0.2 MPa、0.25 MPa和0.3 MPa)下的单轴压缩蠕变试验,分析了其蠕变特性,提出了一个完整描述沥青砂整个蠕变阶段的粘-弹-塑力学模型,该模型由反映弹塑性、粘弹性和粘塑性变形的3个子模型串联构成,通过对粘塑性子模型中粘性系数进行改进,理论推导了模型本构方程。为求得模型参数,编制了非线性拟合程序,得到了参数与加载应力函数关系。进行模型预测与试验结果对比,结果表明,该模型描述了试样在不同应力水平下蠕变变形的3个阶段,能够反映沥青砂粘-弹-塑变形特点。
Uniaxial compression tests are performed under the controlled-stress mode with five different stress amplitudes（0.1 MPa, 0.15 MPa, 0.2 MPa, 0. 25 MPa and 0. 3 MPa）. A viseo-elastoplastic mechanical model of asphalt sand that can describes total creep behavior is presented in this paper. The model is composed of three submodels in series, which describe elastoplastic, viscoelastic and viscoplastic characterization respectively. Through modifying the viscosity coefficient of viscoplastic submodel, a constitutive equation of the model is established for the uniaxial loading condition, and creep representation is also obtained. The resulting visco-elastoplastic model successfully predicts the experimental results under various loading stress amplitudes, and reflects viseo-elastoplastic deformation characterization of asphalt sands.
出处
《公路》
北大核心
2009年第2期121-124,共4页
Highway
基金
国家自然科学基金资助项目,项目编号10672063
关键词
蠕变特性
力学模型
压缩蠕变试验
沥青砂
模型参数
creep behavior
mechanical model
compression creep experiment
asphalt sand
model parameters
