The lift thickness of subgrade fill significantly influences both compaction quality and construction efficiency. With the increasing application of continuous compaction control (CCC) technology, the determination of lift thickness must balance compaction effectiveness and the effective detection range of CCC technology. In this study, field vibratory rolling tests were conducted to investigate the compaction effectiveness, acceleration response, and detection accuracy of CCC indices at various depths. Based on the assumptions of material homogeneity and structural symmetry, a layered symmetric dynamic model of vibratory roller–soil interaction incorporating stress diffusion effects was established to explore the effective detection depth range of CCC technology. The results show that when a 26 t vibratory roller is employed for subgrade compaction, the fill below 40 cm depth cannot be effectively compacted. The correlation between CCC indices (CMV, VCV, and ks) and the compaction coefficients decrease rapidly when the fill layer thickness exceeds 40 cm. The stiffness variation in the fill below 40 cm has a limited effect on the dynamic response of the roller. This study provides a practical approach for determining and optimizing the lift thickness in subgrade construction projects employing CCC technology.
An et al. (Mon,) studied this question.