为探明骨料粒径对水工沥青混凝土动力特性影响规律，针对骨料最大粒径为19、37.5 mm的水工沥青混凝土开展了动三轴试验，在相同配合比参数条件下，基于等效线性黏弹性模型分析了骨料最大粒径对水工沥青混凝土动应力应变曲线、动模量、阻尼比及动力特性参数的影响，根据水工沥青混凝土的应力应变特性进行了滞回圈的修正。结果显示：在周期性振动荷载下，水工沥青混凝土材料具有非线性、滞后性和应变累积性的特点；在同种配合比参数及相同动应力条件下，相较于常规粒径（D_max=19 mm）沥青混凝土，大粒径（D_max=37.5 mm）沥青混凝土的动应变在固结比K_c=1.5时增加了43.1%，在K_c=2.0时增长了31.1%；阻尼比相对提高了13.6%。表明大粒径（D_max=37.5 mm）水工沥青混凝土相对常规粒径水工沥青混凝土具有更强的适应变形能力，抗震性能效果相对较优。研究结果可为大粒径骨料在水工沥青混凝土中的推广应用提供理论基础。

To investigate the influence of aggregate size on the dynamic characteristics of hydraulic asphalt concrete, the effects of maximum aggregate diameters (19 mm and 37.5 mm) was focused on. Dynamic triaxial tests were conducted on hydraulic asphalt concrete with maximum aggregate sizes of 19 mm and 37.5 mm under identical mix proportion parameters. The equivalent linear viscoelastic model was employed to analyze the impacts of maximum aggregate size on dynamic stress-strain curves, dynamic modulus, damping ratio, and dynamic characteristic parameters. The hysteresis loops were modified based on the stress-strain behavior of hydraulic asphalt concrete. The results show that hydraulic asphalt concrete exhibits nonlinearity, hysteresis, and strain accumulation under cyclic dynamic loading. Under identical mix proportions and dynamic stress conditions, compared to conventional-sized aggregates (D_max = 19 mm), the dynamic strain of large-sized aggregates (D_max = 37.5 mm) increases by 43.1% at consolidation ratio K_c = 1.5 and 31.1% at K_c = 2.0. The damping ratio is relatively enhanced by 13.6%. The findings indicate that hydraulic asphalt concrete with large-sized aggregates (D_max = 37.5 mm) demonstrates superior deformation adaptability and seismic performance compared to conventional-sized aggregates. This study provides a theoretical basis for promoting the application of large-sized aggregates in hydraulic asphalt concrete engineering.