基于三维黏弹有限元法的沥青路面结构力学响应分析

发布时间：2018-10-18 20:53

【摘要】：为探究沥青路面在荷载作用下力学响应,基于辽宁省沥青路面足尺加速加载试验,开展路面结构力学仿真方法及力学响应特征研究。采用光纤光栅传感器实测足尺加速加载路面的面层底部、基层底部和路基顶面的力学响应。利用有限元分析软件ABAQUS,建立了基于实测参数的典型半刚性基层沥青路面三维黏弹有限元仿真模型,分析路面结构在不同加载位置下的力学响应,并与加速加载实测结果对比,验证模型的可行性;同时,对路面结构内部的力学响应规律进行分析。结果表明:所建立的仿真模型能较合理地模拟路面结构内部力学响应;沥青混合料黏弹特性导致弹性后效,使力学响应曲线表现出非对称特点。对于沥青层,中面层和下面层上部剪应力和剪应变较大,为车辙发生的薄弱部位;对于沥青层底、水泥稳定碎石层底,控制疲劳开裂的力学响应为水平纵向拉应力和拉应变。
[Abstract]:In order to investigate the mechanical response of asphalt pavement under load, based on the full-scale accelerated loading test of asphalt pavement in Liaoning Province, the simulation method of pavement structure and the characteristics of mechanical response were studied. The mechanical responses of the bottom of the pavement, the base and the top of the roadbed were measured by fiber Bragg grating (FBG) sensor. A 3D viscoelastic finite element simulation model of typical semi-rigid asphalt pavement based on measured parameters is established by using finite element analysis software ABAQUS,. The mechanical response of pavement structure under different loading positions is analyzed and compared with the measured results of accelerated loading. The feasibility of the model is verified. At the same time, the mechanical response law of pavement structure is analyzed. The results show that the established simulation model can simulate the internal mechanical response of pavement structure reasonably, and the viscoelastic properties of asphalt mixture lead to elastic after-effect, which makes the mechanical response curve unsymmetrical. For the asphalt layer, the shear stress and strain of the upper part of the middle layer and the lower layer are large, which is the weak position of rutting, and for the base of the asphalt layer, the mechanical response to the fatigue cracking is horizontal longitudinal tensile stress and tensile strain.
【作者单位】：辽宁省交通科学研究院高速公路养护技术交通行业重点实验室;哈尔滨工业大学交通科学与工程学院;
【基金】：辽宁省交通运输厅交通科技项目(201507)
【分类号】：U416.217

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