以沥青混凝土为基层的路面结构在国内外的公路工程中得到了广泛采用。在受弯时,密实的沥青混凝土面层和多孔的沥青混凝土基层形成一个整体板而共同工作,其弹性模量甚至在盛夏高温季节也很少变化。一般采用标准密实的或多孔的沥青混凝土修筑基层,其相应的剩余孔隙率分别为2.5～4.5%和5～10%。沥青混凝土基层除有许多力学上的优点外,还能减小土基的冻结深度。图1示出了 Pavement structure with asphalt concrete as the basic level has been widely adopted in highway engineering at home and abroad. When bent, the dense asphalt concrete pavement and the porous asphalt concrete base work together to form a one-piece board, and its modulus of elasticity rarely changes even in mid-summer high temperatures. Generally use the standard dense or porous asphalt concrete to build the grassroots, the corresponding residual porosity of 2.5 to 4.5% and 5 to 10%. Asphalt concrete base has many mechanical advantages, but also can reduce the freezing depth of the soil foundation. Figure 1 shows