移动荷载作用下沥青路面主应力轴旋转及方向余弦研究

Study on Principal Stress Axis Rotations and Direction Cosines of Asphalt Pavement Under Moving Loadings

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摘要为揭示单次和多次荷载作用下主应力大小和方向变化对沥青路面的损伤机理,该文采用有限元软件构建了沥青路面结构模型,研究了不同轴载个数作用下沥青路面结构单元的应力路径以及主应力方向余弦变化规律.结果表明:在单次和多次荷载作用下,路面结构单元的应力路径和主应力轴旋转强度时刻发生变化.在荷载移动的过程中,车轮每经过考察断面一次,主应力对应的方向余弦将出现正、负交替转换,且由于不同车轮之间相互作用,导致不同车轮对应的方向余弦正峰值和负峰值不同.第一主应力的方向余弦值沿横向和纵向均发生了瞬时正、负交替转换,表明在车辆加载的过程中主应力方向发生了突变,且在多轮作用下的交替更为复杂.在长期的循环荷载作用下,容易导致路面出现裂缝. To reveal the damage mechanism of asphalt pavement under single and multiple loadings with respect to the variations in the magnitude and direction of the principal stress,an asphalt pavement structure model was constructed with the finite element method.The stress paths and the direction cosine variations of the principal stresses in asphalt pavement structural elements under different numbers of axle loads were investigated.The results show that,under both single and multiple loadings,the stress path and the rotation intensity of the principal stress axis in the pavement structural elements change over time.During the movement of the load,as the wheel passes over the examined section,the direction cosine value corresponding to the principal stress alternates between positive and negative ones.Moreover,due to the interactions between different wheels,the positive and negative peak values of the direction cosines for different wheels differ.The direction cosine values of the 1st principal stress alternately switch between positive and negative ones both in the transverse and longitudinal directions,indicating that the principal stress direction experiences abrupt changes during vehicle loading.Furthermore,the alternations become more complex under multiple wheel loadings.Under prolonged cyclic loadings,this can lead to the formation of cracks in the pavement.

作者董鹏军唐伯明曹雪娟 DONG Pengjun;TANG Boming;CAO Xuejuan(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China;National and Local Joint Engineering Research Center of Transportation and Civil Engineering Materials,Chongqing Jiaotong University,Chongqing 400074,P.R.China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China)

机构地区重庆交通大学土木工程学院重庆交通大学交通土建工程材料国家地方联合工程研究中心重庆交通大学材料科学与工程学院

出处《应用数学和力学》北大核心 2025年第9期1119-1129,共11页 Applied Mathematics and Mechanics

基金国家自然科学基金(52278441) 重庆市研究生科研创新项目(CYB25264)。

关键词沥青路面荷载数量主应力轴方向余弦数值模拟 asphalt pavement load quantity principal axis of stress directional cosine numerical simulation

分类号 U416 [交通运输工程—道路与铁道工程]