Rationale for the Design of a Roller for Compacting Freshly Prepared Soil on a Site for Future Construction

The paper shows the results of exploratory scientific and theoretical research into the design features of a roller for compacting freshly prepared soil at a site for future construction. During the analysis of the designs of existing rollers, it was found that they do not fully meet the requirements for uniform soil compaction along the depth and width of the working part of the roller. It was found that the uniformity of soil compaction can be significantly affected by the configuration of the outer working surface of the roller in the plane of movement. Therefore, optimizing the design of the working surface of the roller will significantly affect the quality of compaction, and further development of new designs of the working surfaces of rollers for soil compaction is an urgent task. The analysis of the designs of rollers for compacting freshly prepared soil showed that a further promising direction for improving their working elements is the use of combined surfaces of complex geometric shapes. The purpose of combining, using complex forms of rollers is to try to use the advantages and eliminate, reduce the disadvantages inherent in their different types. For this purpose, a new roller was proposed, designed for high-quality compaction of freshly prepared soil to the maximum depth in the minimum number of passes. The compacting roller has an outer cylindrical surface in which grooves of a complex geometric profile are made in the form of two harmonic periodic curves, which make it possible to smoothly distribute the load from the roller's action on the soil. Using mathematical modeling, the process of interaction of the roller with the soil environment was studied. It was determined that the main factors influencing the compaction process are the design of the working part and the physical and mechanical properties of the soil. It was established that the nature of the distribution of specific pressure under the working surface of the roller corresponds to its design features. The effectiveness of the proposed design of the roller for compacting freshly prepared soil is ensured by the fact that the design of its working surface allows for uniform compaction of the soil across the width of the roller's grip to the maximum depth and reduces the number of roller passes to ensure the required uniformity of compaction.