路面基层和底基层是联结路基(或垫层)与面层之间的一种路面结构层,它主要承受由面层传来的车轮荷载的垂直压力,并把它扩散,均匀地分开到土基(或垫层)中,这就要求:基层和底基层材料应具有足够的抗压强度和扩散应力的作用:基层应具有较高平整度,以保证面层厚度均匀;基层、底基层和面层应具有很好的结合性,以提高路面结构的整体强度,避免面层沿基层滑移和推挤,以提高行车速度,延长路面使用寿命;基层和底基层应具有足够的水、温 Pavement base and sub-base is a pavement structure between the connecting subgrade (or cushion) and the surface layer, which is mainly subjected to the vertical pressure of the wheel load transmitted from the surface layer and spreads it evenly to the soil Base (or cushion), which requires: grassroots and subsoil material should have sufficient compressive strength and diffusion stress effect: the grassroots should have a higher degree of flatness to ensure that the surface layer thickness uniform; grassroots, subsoil and Surface should have a good combination to improve the overall strength of the pavement structure, to avoid the surface along the grassroots slip and push to improve traffic speed and extend the life of the road; grass-roots and sub-base should have enough water, warm