Dual-band Synthetic Vibratory Compaction Test

This thesis put forward method of multi-frequency composed vibrating compaction. With multi-frequency and multi-amplitude at any moment, different particles of the material are put into the resonance state and the friction between particles is weaken, which are benefit for compaction.This thesis designs double-frequency composite vibrating road roller, then, in the optimal frequency, amplitude, phase, do the abundant experiment to the grade-match soil, Validating that the double-frequency composite vibrating road roller can realize single frequency pressing , surging, vibrating and surging, double-frequency composed vibrating ,and the compaction effect is good, realizes multi-function for one mechanics. When double-frequency composed vibrating compaction, the compaction degree of top loess was 86.4%, and that of sub loess was 77.3%.Test results of different materials, such as loess and silt, indicated that the prototype had good compaction effect, for the compaction degree of top loess was 89.67% after 12 compaction times, and that of sub loess was 78.36%. Also the compaction degree of top silt was 92.29% and that of sub silt was 86.55%.Dynamic signal of experiments was transacted and analyzed. Analysis results of acceleration signal showed that the amplitude of acceleration signal and power spectrum increased at first and stabilized at end when the compaction time added. Different from ordinary single-frequency vibrating compaction, double-frequency composed vibrating compaction had the features of multi-frequency and multi-amplitude and its energy concentrated at double main frequencies. Analysis results of soil pressure signal indicated that the pressure declined more slowly and pressure of subsoil went up more clearly than single-frequency vibrating compaction. Analysis results of dynamic signal prove the superiority of multi-frequency composed...