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道路底层位于面层与土路基之间,它作为路面的承重层,一般结构厚度较大。选用底层材料时,应根据道路的使用要求和“就近取材”原则,使技术上、经济上都比较合理。常用底层材料有级配砂石、碎石、石灰土和工业废料等。好的底层应起到下列作用:(1)能加强面层,调整部分路基冻胀和变形带来的影响;(2)隔断土路基毛细水上升,排除路面下聚
The bottom of the road is located between the surface layer and the soil subgrade. As the bearing layer of the road surface, the general structure is thick. The selection of the bottom material, should be based on the use of the road requirements and “draw near” principle, so that the technical and economic are more reasonable. Commonly used underlying material grading gravel, gravel, lime soil and industrial waste. Good bottom should play the following roles: (1) to strengthen the surface layer, adjust the subgrade frost heave and deformation of the impact; (2) cut off the soil subgrade capillary water rise,