A Numerical Study on the Response of the Oscillation Roller-Soil Interaction System

Abstract

In this contribution, the influence of the operating speed of a specific oscillation roller on the achieved soil compaction and the resulting response behavior of the roller is examined. The main objective is the further validation of an experimentally found Continuous Compaction Control (CCC) parameter for dynamic rollers with an oscillatory drum. The study is based on a recently developed two-dimensional numerical model of the oscillation roller-granular soil interaction system, in which the intergranular strain enhanced hypoplastic constitutive model is implemented to simulate the compaction process. The effect of one roller pass at standard excitation frequency on an initially very loose soil is investigated for six roller speeds in terms of the reduction of the void ratio. Moreover, the influence of the resulting predicted soil compaction on the drum response is analyzed in the time and frequency domain. A relationship between the computed compaction indicator and roller speed is established. It is shown that the roller speed has a significant effect on the achieved soil compaction both in terms of the compaction degree and the depth of influence. The results confirm that the CCC indicator under consideration qualitatively reflects the soil stiffness characterized by the predicted void ratio distribution.