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北京市早在1954年就已广泛利用当地材料修筑公路。颐温公路是就地取材铺筑的级配路面,它是所有最好的级配砾石路面之一。两年来,路面保持着平整,汽车行车时速可达50公里以上。颐温公路所挖取的河滩砂石的自然级配(表1)中含砂较少,但含有较多的由于软弱
As early as 1954, Beijing built extensive roads using local materials. The Yiwen Road is a graded pavement that is built locally and is one of the best graded gravel pavements. In the past two years, the road has remained smooth and the car travels at speeds of up to 50 kilometers per hour. The natural gradation of riverbank gravel dug by the Wen-Wen Highway (Table 1) contains less sand, but contains more due to weakness