我国的砂砾分布广,储量大,其作为一种工程建筑材料,具有压实性好、透水性强、承载能力大等工程特性,且成本低,宜就地取材,但根据规范规定,在以往公路工程中用于路面基层的天然砂砾材料,最大粒径均小于37.5mm,而很多地区天然砂砾37.5mm以上的砾石往往占50%以上,这样势必造成资源浪费。利用当地超大粒径(最大粒径80mm)天然砂砾石修筑符合技术要求的路面基层,合理控制级配,尽量使用原产材料,不掺或少掺加工材料,以本地自然状况、材料供应和施工条件为依据,优化配合比设计,以尽 China’s grit is widely distributed and has a large reserves. As an engineering construction material, it has the characteristics of good compaction, strong water permeability and large carrying capacity, and has the advantages of low cost and suitable for local use. However, according to the specifications, Natural gravel materials used for pavement base in highway engineering are less than 37.5mm in maximum size, while gravel above 37.5mm in many areas often accounts for more than 50%, which is bound to result in waste of resources. Use the local large size (maximum diameter 80mm) natural sand and gravel to meet the technical requirements of the pavement foundation, reasonable grading, try to use the original material, not mixed or less mixed materials, local natural conditions, material supply and construction Conditions as the basis to optimize the mix design, to do