###### Abstract  
The effects of heavy traffic and complex natural environmental conditions have made the problem of the inadequate life expectancy of asphalt pavements increasingly pronounced. In this study, finite-element software was used to establish the three-dimensional analytical model of temperature-load coupling under different axial loads and calculate the distribution law of temperature-load  
has become an urgent problem in the design of semi-rigid asphalt pavement structure combinations and the treatment of reflective cracking disease. Some results have been obtained for the study of the mechanical response of asphalt pavement under loading. [PERSON] et al. [5] investigated the effects of vehicle speed and overloading on the dynamic response of semi-rigid asphalt pavements and found that factors such as overloading and low speeds adversely affect pavement service life. [PERSON] et al. [6,7] investigated the response of semi-rigid asphalt pavements under heavy traffic by means of fiber-optic sensor measurements and theoretical model analysis, and the results showed that fatigue cracks were caused by higher traffic loads. [PERSON] et al. [8,9] analyzed the mechanical response of asphalt pavements under moving loads using buried strain gauges and three-dimensional finite-element modeling, respectively, noting that temperature and travel speed have important effects on the stress response. However, pavements are also affected by environmental factors such as temperature during service. [PERSON] et al. [10] analyzed the temperature response of asphalt pavement under high-temperature conditions based on a three-dimensional finite element model, and the results showed that the tensile and shear stresses of the asphalt layer decreased as the temperature increased. [PERSON] et al. [11] analyzed the temperature response of asphalt pavements under large temperature differences and low temperatures and found that severe cracks in pavements are closely related to dramatic changes in the pavement temperature field. [PERSON] et al. [12] constructed an interlayer contact bonding model for semi-rigid asphalt pavements and found that the area of separation between the asphalt concrete layer and the subgrade negatively affects the strain in the asphalt pavement. Most of the above studies focus on the effect of single factors, such as load and temperature, on the mechanical response of asphalt pavement, which makes it difficult to simulate the complex environment in which asphalt pavement is located. A large number of theoretical and practical studies on asphalt pavements have proved that stress fields, temperature fields, and their coupling exist in asphalt pavement structures. And it directly affects the stability of the asphalt pavement structure, stress distribution, and deformation field in the structural layer [13-15]. The combined effects of temperature and loads on asphalt pavements are not simple linear combinations, and the coupled effects of these actions will exacerbate the damage to the asphalt layer [7,16]. Researchers are beginning to focus on the mechanical response of asphalt pavements under multi-field coupling. [PERSON] et al. [3,17,18] calculated the tensile and shear stresses of semi-rigid asphalt pavements under temperature-load coupling using the extended finite-element method and analyzed the emergence and expansion laws of reflection cracks under the coupling field, and the results showed that the modulus of the underlying layer is an important factor affecting the expansion of reflection cracks. [PERSON] et al. [19-21]. analyzed the mechanical response of saturated asphalt pavements under seepage-stress coupling and showed that higher vehicle speeds generate greater pore water pressure within the pavement. In general, most of the existing studies focus on the effect of a single factor, such as vehicle load or temperature field, on the mechanical response of asphalt pavement structures.