CRC + AC复合式路面热力耦合下动力响应分析

Dynamic Response Analysis of CRC + AC Composite Pavement under Thermal Coupling

摘要: 为研究热力耦合下CRC + AC复合式路面结构的力学响应，利用ABAQUS有限元软件，在进行力学分析时，通过定义预定义场的方式将温度条件输入到路面应力模型中，从而模拟路面在温度与荷载应力耦合作用下的动响应，深入了解沥青路面的破坏机理，分析沥青路面在温度和荷载应力的耦合作用下其内部应力应变的分布特性及变化规律。研究结果表明：在温度作用下沥青层受到拉应力和剪应力，载荷和温度共同作用下沥青层转为受压应力和剪应力；在车辆荷载作用下，CRC层顶面受到较大的拉应力和剪应力，且随着轴重增加CRC层顶面受到的剪应力增加；随着沥青层厚度增加，AC层底面横向和纵向压应力逐渐减小，有转变为拉应力的趋势，AC层顶面横向剪应力逐渐增大，底面横向剪应力则减小；降温主要对横向和纵向应力影响较大，降温越大横、纵向拉应力越大，对剪应力影响较小，且降温对CRC层横向和纵向应力的影响更大。

Abstract: In order to study the mechanical response of the CRC + AC composite pavement structure under thermal and mechanical coupling, the ABAQUS finite element software is used to input the tem-perature conditions into the pavement stress model by defining a predefined field during mechanical analysis, thereby simulating the temperature of the pavement. Dynamic response coupled with load and stress, deeply understand the failure mechanism of asphalt pavement, and analyze the distribution characteristics and change law of internal stress and strain of asphalt pavement under the coupling effect of temperature and load stress. The research results show that under the action of temperature, the asphalt layer is subjected to tensile stress and shear stress, and under the combined action of load and temperature, the asphalt layer turns into compressive stress and shear stress; under the action of vehicle load, the top surface of the CRC layer is subject to greater tensile stress and shear stress, and as the axle load increases, the shear stress on the top surface of the CRC layer increases; as the thickness of the asphalt layer increases, the transverse and longitudinal compressive stresses on the bottom surface of the AC layer gradually decrease, and there is a tendency to transform into tensile stress, the transverse shear stress on the top surface of the AC layer gradually increases, and the transverse shear stress on the bottom surface decreases; cooling has a great impact on the transverse and longitudinal stress, the greater the cooling, the greater the transverse and longitudinal tensile stresses, and the smaller the impact on the shear stress. Compare with AC layer, the cooling has a greater impact on the transverse and longitudinal stresses of the CRC layer.