Features of interaction modes of vibratory roller drum and soil surface

Introduction. Vibratory rollers are widely used for soil compaction mechanization in road construction. Due to high values of the driving force generated by the vibration exciter, there is periodic separation of the vibratory roller drum from the ground during oscillations. The study into the features of these oscillation modes is of great importance in determining technical characteristics of vibratory rollers during design.

Materials and methods. The paper presents a three-mass rheological model of the Frame-Drum-Soil system with a deformable drum, the soil mass being equal to 20% of the drum mass. Voigt model was used to model the soil properties. The rheological model allows reproducing different modes of drum and soil interaction: those without and with various types of separation from the soil.

Results. Based on the results of computational experiment with a test vibratory roller, the characteristic features of the drum and the roller frame vibrations, as well as changes in the contact force and soil loading and unloading time for “continuous contact”, “partial uplift”, “double jump” oscillation modes and two-fold oscillations have been established. The expediency of developing promising soil compacting machines operating in two-fold oscillations mode and having an increased compaction performance due to the significantly greater contact force compared to the driving force of the installed vibration exciter and a comparatively long time for the contact force, which provides an increase in the depth of stress propagation and, accordingly, the thickness of the compacted soil layer.

Discussion and conclusion. The paper specifies the criteria for determining the oscillation modes implemented as the “constant contact”, “partial separation”, “double jump” modes or two-fold oscillations. New data are also presented on the values of soil loading and unloading time for various modes of drum vibration, which is important for determining the depth of stress propagation and deep soil compaction.

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