大家知道,在别洛露西亚南部,尤其是在波列西亚地区是不出产石料的。所以利用其他的当地材料来修筑硬路面具有重要的意义。 1954年别洛露西亚国家设计院接受了设计几条通过波列西亚地区的道路的任务,当地条件如下: 1、筑路地区的土壤是由细砂构成的;70～85％的细砂粒径为0.25～0.05公厘。 2、设计路线需要敷设在距离铁路50～60公里的地 Everyone knows that no stone is produced in southern Belo Lucia, especially in the area of ​​Plessisia. Therefore, the use of other local materials to build hard pavement is of great significance. In 1954, BIRI accepted the task of designing several roads through the Porec region. The local conditions were as follows: 1. The soil in the road construction consisted of fine sand; 70-85% of the fine sand The diameter of 0.25 ~ 0.05 mm. 2, the design route needs to be laid 50 to 60 kilometers away from the railway