基于数值模拟的多次损伤愈合作用下沥青混合料抗裂性能的改变

The Crack Resistance Change of Asphalt Mixture under Multiple Damage-healing based on Numerical Simulation

沥青混合料愈合以后强度能够恢复至初始水平,但其内部抗裂性能会发生相应的改变,多次损伤愈合后,沥青混合料的强度损失速率会迅速增大。因此,通过构建沥青混合料多次损伤愈合的本构模型,探讨了多次损伤愈合后,沥青混合料数字试件内部裂缝演变机制以及组分性能的改变。研究结果表明:多次损伤愈合后,沥青混合料内部裂缝扩展的范围增大、裂缝数量增多,损伤部位的刚度有所降低。该结果可为类似研究提供参考。

After self-healing,the strength of asphalt mixture can restore to its original level.But the internal crack resistance performance would change accordingly.After several times of damage-healing,the strength loss rate would increase rapidly.In this study,the evolution mechanism of internal cracks and the change of component performance of asphalt mixture specimens after multiple damage-healing were discussed by building the constitutive model.The study shows that the expansion range of internal cracks and the number of cracks in asphalt mixture will increase after several times of damage healing,and stiffness of the damage part would decrease.The result will provide reference for similar study.