Influence of Rocking Motion on Vibratory Roller-Based Measurement of Soil Stiffness
Publication: Journal of Engineering Mechanics
Volume 136, Issue 7
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.
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Acknowledgments
The writers are grateful to the Florida Department of Transportation for providing access to field test sites and to Sakai for providing the vibratory roller compactor used in this study. Partial funding for this research was provided by the National Cooperative Highway Research Program (Project No. UNSPECIFIED21-09).
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 136 • Issue 7 • July 2010
Pages: 898 - 905
Copyright
© 2010 ASCE.
History
Received: Oct 9, 2009
Accepted: Dec 22, 2009
Published online: Dec 28, 2009
Published in print: Jul 2010
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