The research on expressway embankment with sand-gravel-cobble mixture is in discussing. In order to research on the compaction effect of expressway embankment with sand-gravel-cobble mixture

the screening test

heavy compaction test and California bearing ratio (CBR) test in laboratory have been carried out; and through these tests the grain composition of sand-gravel-cobble mixture

the relation between maximum dry density and coarse particle content

the relation between best water content with coarse particle content and the relation between CBR value with coarse particle content or compaction times are obtained. The results show that the maximum dry density first increases and then decreases when the coarse particle content increases; and CBR value increases when the coarse particle content increases. Then compaction mechanism of sand-gravel-cobble mixture used in embankment filling is analyzed. Based on compaction test in field

the construction technology of embankment with sand-gravel- cobble mixture is obtained. The compaction effect is detected by using compaction degree

CBR

deflection

modulus of resilience and settlement discrepancy. In the end

the suitable detection methods of embankment with sand-gravel-cobble mixture are suggested by analyzing the reliability of every detection method; and the standard value of settlement discrepancy is obtained based on statistics theories

and determined using both settlement discrepancy and compaction times to guarantee compaction. Some useful conclusions are obtained.