Based on dynamic testing technology applying (earth pressure cells

EPCs) and (linear variable differential transformers

LVDTs)

combining with the field vibration compaction tests

the internal stress and deformation characteristics and energy input mechanism of rockfill were studied. In the process of compaction

the maximum dry density of rockfill was determined. The results showed that: 1) The additional peak stress of rockfill in the depth range was between 0.3?1.4 MPa. The dynamic peak stress was between 0.22?0.82 MPa

which decayed exponentially along with the increasing of the depth of rockfill. 2) The measured dynamic strain significantly lagged behind the dynamic stress. With the increase of rolling times

the hysteretic cycle became steeper and smaller

while the soil stiffness increased and the damping decreased. 3) Dynamic stress

static stress and deformation were obtained through spectrum analysis and filtering methods

based on which the relationship between the input energy of the vibratory roller and the measured dry density was established. Then

the maximum dry density of rockfill and its relative density under different rolling times were calculated. This method can provide a basis for quality control of rockfill dam using the relative density index.