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Influence of Rocking Motion on Vibratory Roller-Based Measurement of Soil Stiffness
Authors:Norman W Facas  Paul J van Susante  Michael A Mooney
Affiliation:1Graduate Student, Div. of Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401 (corresponding author). E-mail: nfacas@mines.edu
2Adjunct Lecturer, Div. of Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401.
3Professor, Div. of Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401. E-mail: mooney@mines.edu
Abstract:Experimental data have shown that vibratory roller compactors often exhibit rotational kinematics in addition to translation during operation. This rotation is not considered in roller-integrated measurement systems that estimate soil stiffness based on drum vibration. To model and explore the effect of rotation, a lumped parameter roller/soil model was developed. The machine parameters for this model were tuned from suspended drum testing that isolated the drum from the ground. The model was then verified using field data collected over a range of excitation frequencies on spatially homogenous soil, and over transversely heterogeneous soil using one excitation frequency. Rotational motion was found to significantly influence roller-integrated measurement of soil stiffness based on single position drum vibration data. Rotational motion causes single position measurement system results to be nonunique and to vary depending on the direction of roller travel. Using the model, various alternative measurement schemes were investigated. The directional dependence was eliminated by deriving a measurement at the drum’s center of gravity, and dual-sided measurement is proposed to gain a measure of heterogeneity. A more theoretical approach was also created wherein the contact force between the drum and soil are measured rather then being calculated.
Keywords:Vibration  Soil compaction  Parameters  Models  Stiffness  Measurement  Kinematics  
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