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Investigating the effectiveness of Rolling Dynamic Compaction (RDC) using Discrete Element Method (DEM)

机译：Investigating the effectiveness of Rolling Dynamic Compaction (RDC) using Discrete Element Method (DEM)

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摘要

Rolling dynamic compaction is a soil compaction technique which involves compacting the ground with a heavy, non-circular module. Compared with traditional compaction methods, it is, in most cases, more efficient, as it improves the soil to a greater depth and it facilitates more rapid ground improvement due to its higher travel speeds. However, to date, there is a limited understanding of the nature of the subsurface improvement as a result of RDC. This paper presents a three-dimensional finite element method (FEM)-discrete element method (DEM) model which simulates the movement of soil particles, and the porosity, and hence density, variations during the RDC process. The FEM-DEM model is developed using experimental tests, and the numerical results are in good agreement with the laboratory test results. The effectiveness of 1:13 scale models of the 4-sided, 8- and 12-tonne, Broons BH-1300 and BH-1300 HD impact rollers are analysed based on the soil porosity variations. The relationships between porosity, soil displacements and the motion of the roller module are also investigated. The results of this study demonstrate the capability of the FEM-DEM model to simulate reliably the ground improvement induced by RDC.

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