Great amount of engineering practices indicate that the single index Dc

degree of compaction could not well control the quality of embankment filled with high liquid limit soil (including the improved high liquid limit soil)

and may cause quality hidden dangers. Through experimental study

this paper proposes a quality control method using two indices to control the quality of embankment filled with high liquid limit soil; and the two indices are the volume ratio of air Va and the degree of compaction Dc. When Dc is more than 93%

the suggested value for high liquid limit soil (or silt) is 4%≤Va≤8%

and the suggested value for high liquid limit sand soil (or silt) is 6%≤Va≤13%. The feasibility and validity of this two indices quality control method was verified through tests in laboratory and test sections. The results show that adopting the two indices (Va and Dc ) could not only guarantee the intensity and stiffness

but also ensure better water stability

so as to provide technical supports for further full use the high liquid limit soil as embankment filler.