耦合场下陕北地区半刚性沥青路面力学响应分析  

Mechanical response analysis of semi-rigid asphalt pavement in Northern Shaanxi under coupling field

作　　者：申爱琴[1] 靳欣宽 郭寅川[1] 何子明 王胜难 SHEN Ai-qin;JIN Xin-kuan;GUO Yin-chuan;HE Zi-ming;WANG Sheng-nan(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2022年第5期1-11,共11页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(52078050);陕西省交通科技计划项目(21-47K)。

摘　　要：针对陕北地区半刚性沥青路面裂缝等病害严重的问题,对其在实际温度场、动载及温度-动载耦合作用下的力学响应进行了分析。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沥青路面结构三维有限元模型,分析其在实际温度场、动载及耦合场条件下路面结构的力学响应规律。通过现场检测进一步探究了该地区半刚性沥青路面的破坏机理,并与有限元模拟结果进行了对比验证。研究结果表明:温度场作用下,路面各结构层拉应力随温度呈现出规律性变化,路面下面层的拉应力最大,底基层的拉应力最小;春季比冬季时温差对路面结构的破坏更严重,面层最大拉应力达1.488 MPa,路面极易因受拉而开裂。动载作用下,结构层中将产生较大的拉应力、剪应力及拉应变,底基层拉应变可达30×10^(-6)~40×10^(-6),较面层拉应变增大20×10^(-6)以上,故易从底部产生反射裂缝;超载作用会增大路面各结构层的力学响应值,增幅可达20%。耦合场作用与单一因素作用相比,会显著增大路面各结构层的力学响应值,路面受力状态更为复杂;春季温差-动载耦合作用对路面结构的拉应力和拉应变指标更为不利,而冬季温差-动载耦合作用下路面结构具有更大的剪应力。现场调研和检测结果与有限元模拟结果吻合较好。研究结果可为同类地区半刚性沥青路面结构组合设计、病害预防及处治提供理论参考。Aiming at the serious problems such as cracks of semi-rigid asphalt pavement in Northern Shaanxi, the mechanical response of semi-rigid asphalt pavement under the actual temperature field, dynamic load and temperature-dynamic load coupling was analyzed. The finite element analysis software ABAQUS was used, and a three-dimensional finite element model of a typical semi-rigid asphalt pavement structure based on measured parameters was established. The mechanical response law of the pavement structure under the actual temperature field, dynamic load and coupled field conditions was analyzed. The failure mechanism of the semi-rigid asphalt pavement in this area was further explored through on-site inspection, and the results were compared and verified with the finite element simulation results. The results show that under the action of the temperature field, the tensile stress of each structural layer of the pavement changes regularly with the temperature. The tensile stress of the lower layer of the pavement is the largest, and the tensile stress of the subbase layer is the smallest, the temperature difference in spring damages the pavement structure more seriously than winter. The maximum tensile stress of the surface layer is up to 1.488 MPa, and the pavement is easily cracked due to tension. Under the action of dynamic load, greater tensile stress, shear stress and tensile strain will be generated in the pavement structure layer. The tensile strain of the subbase layer can reach 30×10^(-6) to 40×10^(-6), which exceed 20×10^(-6) larger than the tensile strain of the surface layer, so it is easy to generate reflection cracks from the bottom, and overloading will increase the mechanical response value of each pavement structure layer by up to 20%. Compared with the action of a single factor, the coupling field action will significantly increase the mechanical response value of each structural layer of the pavement, and the stress state of the pavement is more complex. The temperature-dynamic load coupling effect

关 键 词：道路工程 半刚性沥青路面 有限元分析 温度场 移动荷载 动力响应 

分 类 号：U416.223[交通运输工程—道路与铁道工程]