新筑路堤的强度和稳定性与土的密度有关。现行施工规范规定上部(路面下1.2米处)的密实度(夯实密度与最佳密度之比)为90％,下部为85％;由于路堤的自然沉陷和行车后土的不断压缩,又规定土方予留量为1—3％。在施工过程中,经常由于人工夯实控制不严格,未能达到要求的密实度。这样,路堤土壤的密度小,下沉量增大,不仅不能保证路基的稳定性,道碴的用量相对增加,造成经济上 The strength and stability of newly built embankments are related to the density of soil. The current construction code stipulates that the density (ratio of compaction density to optimal density) in the upper part (1.2 meters below the road surface) is 90% and that in the lower part is 85%. Due to the natural subsidence of the embankment and the constant compression of soil after driving, To stay for 1-3%. In the construction process, often due to manual compaction control is not strict, failed to meet the required density. In this way, the density of the embankment soil is small, the sinking volume increases, not only can not guarantee the stability of roadbed, the relative increase in the amount of ballast, resulting in economic