根据北京市冬季气温调研,确定室内冻融循环试验周期,分别对7组环氧沥青混凝土试件进行不同次数的冻融循环,通过室内三点弯曲试验得到不同冻融循环次数下环氧沥青混凝土的弯曲劲度模量和断裂能,采用数值模拟方法计算不同冻融循环次数下环氧沥青混凝土的平面应变断裂韧度.研究结果表明:环氧沥青混凝土弯曲劲度模量随冻融循环次数的增加而减小,冻融循环次数为30次时,环氧沥青混凝土弯曲劲度模量的冻融损伤量为60%;环氧沥青混凝土断裂能和平面应变断裂韧度随冻融循环次数的增加呈先减小后增大的趋势,冻融循环为15次时,环氧沥青混凝土断裂能和平面应变断裂韧度达到最小值. According to the winter temperature survey in Beijing, the indoor freeze-thaw cycle test cycle was determined. Seven groups of epoxy asphalt concrete specimens were subjected to freeze-thaw cycles at different times. The indoor three-point bending test was used to obtain the epoxy asphalt concrete Bending flexural modulus and fracture energy, the plane strain fracture toughness of epoxy asphalt concrete under different freeze-thaw cycles was calculated by numerical simulation.The results show that the bending stiffness modulus of epoxy asphalt concrete increases with the number of freeze-thaw cycles The freeze-thaw cycle number is 30 times, the freeze-thaw damage amount of epoxy asphalt concrete flexural stiffness modulus is 60%; the fracture energy and plane strain fracture toughness of epoxy asphalt concrete vary with the number of freeze-thaw cycles Increase first and then increase. The freeze-thaw cycle is 15 times, the fracture toughness of epoxy asphalt concrete and the plane strain fracture toughness reach the minimum value.