The stress concentration on the crack tip would be eliminated greatly by the existences of holes in the heavy grains asphalt overlays.It contributes to hindering the further development of the crack.

• 大粒径碎石沥青加铺基层中孔洞的存在极大地消减了裂缝尖端的应力集中，有助于阻碍裂缝的进一步发展。