Е-Публикации
Технически университет - София

Abstract: The object of the study is a single-drum vibratory roller, which is widely used in construction technology. It presents a theoretical investigation on improving compaction efficiency, focusing on the compaction process of a base course for foundations with a specified model of a single-drum vibratory roller, including various soil types. In the present study is considered a methodology for the optimal combination between the technical data of the roller (e.g.: own weight of the roller, excitation frequency, etc.) and the mechanical characteristics of the compacted material (e.g.: material density, elasticity modulus, etc.). The current analysis is based on a mathematical model of a vibratory roller with three degrees of freedom, for which differential equations of dynamic motion are obtained. The equations of motion are solved for an exemplary model of vibratory roller, using five different types of compacted material, as well as three possible input excitation frequencies. For each of the cases is calculated the maximum amplitude of vibratory compaction motion which is obtained under the roller steel drum (the so called: "compaction amplitude"), on which the compaction efficiency is most dependent, i.e. as high the compaction amplitude is, as better the compaction efficiency is. For the exemplary vibratory roller model used in this study, the analysis shows that at an excitation frequency of 25 Hz, compaction is 1.19 times more effective (corresponding to a 19% higher compaction amplitude) when applied to granular soils with small particles (up to 0.5 cm) compared to granular soils with large particles (up to 10 cm). The presented methodology can be useful for practicing engineers when performing an optimal selection of a vibratory roller model for assigned compaction work, helping them to improve the efficiency and productivity of the performed compaction work at the building site.

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