移动荷载作用下正交各向异性地基—黏弹性路面结构动力响应的数值模拟

Numerical Simulation of Dynamic Response of Orthotropic Foundation-Viscoelastic Pavement Structure Under Moving Loads

【目的】沥青路面结构在重载车辆的作用下易产生路面典型损害,通过ABAQUS软件进行数值模拟,研究常温状态下半刚性基层沥青路面结构在实际车辆荷载作用下的动力响应。【方法】将半刚性基层沥青路面道路结构简化为面层-基层-路基3层结构,沥青面层黏弹性采用Burgers模型描述,路基土体通过正交各向异性弹性介质模拟,路面车辆荷载采用移动简谐荷载进行模拟。【结果】路基土体正交各向异性,荷载移动速度、振动频率对道路表面竖向位移及竖向正应力有不同程度的影响。【结论】考虑土体正交各向异性能更准确地描述路基路面的动力响应特性,荷载振动频率、荷载移动速度会对路面竖向位移和竖向正应力产生较为明显的影响。

[Purposes]Asphalt pavement structures are prone to typical damage under the action of heavy-duty vehicles.Numerical simulation was conducted using ABAQUS software to study the dynamic response of semi-rigid base asphalt pavement structures under actual vehicle loads at room temperature.[Methods]The semi-rigid base asphalt pavement road structure is simplified into a three-layer structure of surface layer,base layer,and roadbed.The viscoelasticity of the asphalt surface layer is described us-ing the Burgers model,and the roadbed soil is simulated using orthogonal anisotropic elastic media.The vehicle load on the road surface is simulated using moving harmonic loads.[Findings]Based on ABAQUS finite element analysis software,a semi-rigid base asphalt pavement structure model was es-tablished,and the orthogonal anisotropy of the roadbed soil,the influence of load movement speed and vi-bration frequency on the vertical displacement and vertical normal stress of the road surface were ana-lyzed.[Conclusions]Considering the orthogonal anisotropy performance of soil can more accurately de-scribe the dynamic response characteristics of roadbed and pavement,the frequency of load vibration and the speed of load movement have a significant impact on the vertical displacement and vertical normal stress of the road surface.