公路路基是土体构筑物，含天然土地基和人工填土路堤两大部分。
Highway subgrade is soil body structure including natural earth foundation and artificial fill embankment.
天然砂砾料是山区河道中丰富的自然资源，也是压实后稳定性良好的路基填筑材料。
Natural gravel is rich natural resources and also better stable compacting roadbed material in the river courses of mountain areas.
得出再生集料可以替代天然集料用于高等级公路基层和底基层的结论。
Regeneration aggregate can substitute natural aggregate and be used for highway base and subbase aggregate.
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