沥青混凝土的增量蠕变模型研究

摘要：复杂变应力工作条件下水工沥青混凝土的蠕变不仅与应力状态有关，而且与应力历史和应力路径有关，具 有遗传特性。利用某心墙堆石坝沥青混凝土的室内三轴蠕变试验资料，得到沥青混凝土试样的试验应力与对应最 终剪切蠕变量具有较好的双曲线关系；引入随应力状态改变而变化的蠕变剪切模量，基于Leaderman叠加原理， 建立了可反映复杂应力路径影响的五参数增量蠕变模型。并应用该模型对某坝进行了非线性黏弹性有限元分析， 结果表明：建议模型的计算值与大坝原型实测结果吻合较好，可用于变应力作用下具有遗传特性的沥青混凝土结 构

Study on increment creep model of asphalt concrete

Under complex and alternating stress conditions,the creep of hydraulic asphalt concrete exhibits genetic characteristics,which not only depend on stress state,but also stress history and stress path.Hyperbola function can fit the relationship well between test stress of asphalt concrete specimens and ultimate shear creep according to the indoor triaxial creep test data of an asphalt concrete core rockfill dam.Based on Leaderman superposition principle,an incremental creep model with five parameters has been...