应用MTS试验仪进行沥青砂浆直剪试验,研究分析了级配、沥青基材料和冻融作用对沥青砂浆剪切力学性能的影响。结果表明:同等粒径条件下,体积比增加1%,内摩擦角φ、黏聚强度c分别增加7.3%、3.4%;非同等粒径条件下,最大粒径为1.18mm沥青砂浆φ、c值是最大粒径0.075mm沥青砂浆的4.03倍和3.33倍。橡胶沥青砂浆抗剪性能明显高于70#沥青,添加外加剂KS后效果更优,其φ、c值至少提高30.5%、45.5%。冻融作用后,70#沥青+KS、橡胶沥青+KS的φ、c值最小降低12.3%、8.2%,有效控制冻融作用,可以有效保障沥青砂浆的抗剪性能。 The MTS tester was used to test the direct shear test of asphalt mortar. The effects of gradation, asphalt-based materials and freeze-thaw action on shear mechanical properties of asphalt mortar were studied. The results show that the volume fraction increases by 1%, the internal friction angle φ and the cohesive strength c increase by 7.3% and 3.4%, respectively. Under the same particle size, the maximum particle size is 1.18 mm, The value is 4.03 times and 3.33 times the maximum particle size of 0.075mm asphalt mortar. The shear resistance of rubber asphalt mortar is obviously higher than that of 70 # asphalt. The effect of adding KS is better and the values ​​of φ and c are increased by at least 30.5% and 45.5% respectively. After freeze-thaw, the φ and c values ​​of 70 # asphalt + KS and rubber asphalt + KS can be reduced by 12.3% and 8.2%, respectively, and the freeze-thaw effect can be effectively controlled to effectively protect the shear resistance of asphalt mortar.