Abstract: The indies currently used for evaluating the compaction quality of railway subgrade are not sufficient for evaluation. Based on the fundamental theory of continuous compaction control, a kinetic analysis of the interaction between the roller’s vibrating wheel and the subgrade structures is performed, and the acceleration signals of the vibrating wheel, which was collected by collecting vibration frequency sensor, are analyzed by magnifying, filtering and other treatment; through analogue-digital conversion, the analogue signals are converted to digital ones. The treated acceleration signal of the vibrating wheel is used as the measuring index for continuous compaction–vibrating compaction value (VCV), to evaluate the real-time compaction quality of the subgrade. By comparing and analyzing the VCV and regular indexes of K30, Evd, Ev1 and Ev2 under category of plate loadings, which were obtained from two testing sections of high speed railway, it is revealed that, the continuous compaction index has a linear relationship with the regular index under category of plate loadings. Therefore, the control standard for vibrating compaction value can be determined with the compaction standard of the regular index, providing a basis for the inspection and control of the continuous compaction of subgrade.

Key words: continuous compaction control technology, compaction quality, vibrating compaction value, regular indexes, correlation relationship, inspection and control