为了解决刚性基层沥青路面存在的沥青面层反射裂缝问题,提出了采用开级配大粒径沥青碎石混合料(Opengraded Large Stone Asphalt Mixes,OLSM)作为裂缝缓解层的方法,以国内外OLSM参考级配为基础,结合试验段修筑情况,采用二维有限元方法,建立设置OLSM-25裂缝缓解层的沥青路面有限元模型,对设置不同类型裂缝缓解层、不同级配OLSM-25裂缝缓解层的沥青路面进行疲劳分析,从宏观力学响应方面阐释了OLSM-25裂缝缓解层的抗裂机理。结果表明:在车辆荷载偏载作用下,与相同厚度的普通AC-25裂缝缓解层相比,采用OLSM-25裂缝缓解层可有效减缓基层裂缝的扩展速率,显著提高沥青路面结构的疲劳寿命,OLSM-25裂缝缓解层的抗裂效果优于普通AC-25裂缝缓解层。 In order to solve the problem of reflective cracking of asphalt pavement on rigid base asphalt pavement, an open grade large aggregate Asphalt Mixes (OLSM) as crack mitigation layer is proposed. According to OLSM reference Based on the grading, the finite element model of asphalt pavement with OLSM-25 crack mitigation layer was set up based on the construction of experimental section and two-dimensional finite element method. OLSM-25 crack mitigation layer with different types of crack mitigation layer, Of asphalt pavement fatigue analysis, from the macroscopic mechanical response to explain the OLSM-25 crack mitigation crack resistance mechanism. The results show that the OLSM-25 crack mitigation layer can effectively reduce the crack growth rate and improve the fatigue life of the asphalt pavement structure significantly compared with the conventional AC-25 crack mitigation layer under the same load. OLSM-25 crack mitigation crack better than ordinary AC-25 crack mitigation layer.