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Dynamic response of vertically oscillating foundations at large strain
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0002-7361-0729
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0001-9615-4861
2014 (English)In: Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 / [ed] Oka, Murakami, Uzuoka & Kimoto, CRC Press, 2014, 643-647 p.Conference paper, Published paper (Refereed)
Abstract [en]

A method for calculating the dynamic response of a vertically oscillating foundation on soil with strain-dependent properties is developed. Strain-dependent stiffness and damping are incorporated by an iterative procedure, presenting the response in frequency domain. The calculated dynamic displacement amplitudes are compared to small-scale tests using a vertically oscillating plate. The calculated dynamic quantities agree well with measured amplitudes over a wide frequency range.

Place, publisher, year, edition, pages
CRC Press, 2014. 643-647 p.
Keyword [en]
Dynamic response, Iterative methods, Soil testing, Dynamic displacements, Frequency domains, Large strains, Oscillating plates, Small-scale tests, Stiffness and damping, Strain-dependent, Wide frequency range
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-157738DOI: 10.1201/b17435-111ISI: 000380614500100Scopus ID: 2-s2.0-84907306492ISBN: 978-113800148-0 (print)OAI: oai:DiVA.org:kth-157738DiVA: diva2:771460
Conference
14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014; Kyoto; Japan; 22 September 2014 through 25 September 2014
Note

QC 20141217

Available from: 2014-12-13 Created: 2014-12-13 Last updated: 2016-09-05Bibliographically approved
In thesis
1. Frequency Optimization of Vibratory Rollers and Plates for Compaction of Granular Soil
Open this publication in new window or tab >>Frequency Optimization of Vibratory Rollers and Plates for Compaction of Granular Soil
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Vibratory rollers are commonly used for compaction of embankments and landfills. This task is time consuming and constitutes a significant part of most large construction and infrastructure projects. By improving the compaction efficiency, the construction industry would reduce costs and environmental impact.

This research project studies the influence of the vibration frequency of the drum, which is normally a fixed roller property, and whether resonance can be utilized to improve the compaction efficiency. The influence of frequency on roller compaction has not before been studied but the concept of resonance compaction has previously been applied successfully in deep compaction of fills and natural deposits.

In order to examine the influence of vibration frequency on the compaction of granular soil, small-scale compaction tests of sand were conducted under varying conditions with a vertically oscillating plate. Subsequently, full-scale tests were conducted using a vibratory soil compaction roller and a test bed of crushed gravel. The results showed that resonance can be utilized in soil compaction by vibratory rollers and plates and that the optimum compaction frequency from an energy perspective is at, or slightly above, the coupled compactor-soil resonant frequency. Since rollers operate far above resonance, the compaction frequency can be significantly reduced, resulting in a considerable reduction in fuel consumption, environmental impact and machine wear.

The thesis also presents an iterative equivalent-linear method to calculate the frequency response of a vibrating foundation, such as a compacting plate or the drum of a roller. The method seems promising for predicting the resonant frequency of the roller-soil system and can be used to determine the optimum compaction frequency without site- and roller-specific measurements.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 40 p.
Series
TRITA-JOB PHD, ISSN 1650-9501 ; 1022
Keyword
compaction, vibratory roller, frequency, resonance, vibration, sand, gravel, soil dynamics
National Category
Geotechnical Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-187352 (URN)978-91-7729-042-1 (ISBN)
Public defence
2016-08-26, F3, Lindstedtsvägen 26, Stockholm, 13:00
Opponent
Supervisors
Note

QC 20160613

Available from: 2016-06-13 Created: 2016-05-20 Last updated: 2016-06-13Bibliographically approved

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Wersäll, CarlLarsson, Stefan

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