Comparison between vibrating and jumping compaction effect of a tracked vehicle for a high lifted decomposed granite soil

摘要

The main purpose of this paper is to compare the effects of a vibrating and jumping action of a tracked vehicle mounted with a vertical oscillator on vibro-compaction of a high lifted decomposed granite soil. A vibratory compaction test was executed using a model tracked vehicle of 4.9 kN weight under a condition of frequency of 16 Hz and load ratio of 1.0 and 2.0. As a result, it was observed that both the amount of sinkage of terrain surface and the dry density of soil increased with increment of the load ratio and the dry density distribution with depth became uniform for the whole depth of the soil stratum. It was confirmed that the volume shrinkage of soil was succeeded by the propagation of acceleration to deep stratum due to the jumping action and the dilatancy phenomenon due to an alternative shear stress. In the application of these test results to an actual prototype tracked vehicle of 39.2 kN weight, it was estimated that the degree of compaction of a high lifted soil stratum of 90 cm became over 90% at the load ratio of 2.0.