根据南方湿热地区旧水泥路面加铺改造工程中存在反射裂缝的病害问题，设计了一种可用于抗裂夹层或加铺结构层的双纤维增强型沥青混合料，通过高温贯入试验、低温弯曲试验、冻融劈裂试验、半圆弯曲试验（the semi-circular bend test, SCB）、间接拉伸开裂试验（the indirect tensile cracking test, IDEAL-CT）以及半圆弯曲裂缝扩展试验分析了双纤维增强型沥青混合料的高温性能、低温性能、水稳定性和疲劳抗开裂性能，并基于扩展有限元（extended finite element method, X-FEM）和改进的Paris公式，依托实体工程路面结构建立交通荷载作用下的裂缝疲劳扩展有限元模型分析抗裂性能。研究结果表明：针对南方湿热地区，推荐1∶1的掺配比例将木质素纤维与玄武岩纤维掺入沥青混合料时，此时双纤维增强型沥青混合料具有较好的高温抗变形能力及水稳定性，贯入强度为1.27 MPa，最大弯拉应变为3 596.3 μɛ，残留稳定度为94.1%，冻融劈裂强度比为96.2%。且具有较好的抗开裂性能，疲劳寿命可达30 503次（0.2应力比），起裂能为5 343.9 J/m²，柔性指数为22.82。针对低温地区，推荐木质素纤维与玄武岩纤维掺配比例为1∶3的双纤维增强型沥青混合料，其具有更好的低温性能。对旧水泥路面进行处治，使旧水泥路面的接缝传荷系数提升到80%以上再进行延寿加铺，更能发挥双纤维增强型沥青混合料抗反射裂缝的效果。

According to the problem of reflection crack in the retrofitting project of old cement pavement in hot and humid area of South China, a dual fiber reinforced asphalt mixture that can be used for anti-crack interlayer or overlay structure layer was designed. Through high temperature penetration test, low temperature bending test, freeze-thaw splitting test, the semi-circular bending test(SCB), the indirect tensile cracking test (IDEAL-CT) and semi-circular bending crack extension test, the high temperature performance and low temperature performance, water stability and fatigue cracking resistance of dual fiber reinforced asphalt were analyzed. Based on the extended finite element method (X-FEM) and improved Paris formula, the crack fatigue extension finite element model under traffic load was established to analyze the anti-cracking effect of dual fiber reinforced asphalt mixture. The findings indicated that in the context of southern climates characterized by high temperatures and humidity, the incorporation of a 1∶1 ratio of lignin and basalt fibers into asphalt mixtures resulted in enhanced high-temperature deformation resistance and water stability. The penetration strength was 1.27 MPa, the maximum bending and tensile strain was 3 596.3 μɛ, the residual stability was 94.1%, and the freezing and thawing cleavage strength ratio was 96.2%. Furthermore, the material exhibits excellent anti-cracking properties, with a fatigue life of 30 503 cycles (0.2 stress ratio), the cracking energy was 5 343.9 J/m², and the flexibility index was 22.82. In regions with low temperatures, the use of a dual-fiber reinforced asphalt mixture, comprising a lignin fiber to basalt fiber ratio of 1∶3, was recommended to enhance low-temperature performance. Dual fiber reinforced asphalt mixtures are more effective against reflective cracking when treating old concrete pavements until the joint load transfer coefficient of the old concrete pavement is increased to 80%.