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Publications (10 of 25) Show all publications
Massarsch, K. R., Wersäll, C. & Fellenius, B. H. (2020). Horizontal stress increase induced by deep vibratory compaction. Proceedings of the Institution of Civil Engeneers: Geotechnical Engineering, 173(3), 228-253
Open this publication in new window or tab >>Horizontal stress increase induced by deep vibratory compaction
2020 (English)In: Proceedings of the Institution of Civil Engeneers: Geotechnical Engineering, ISSN 1353-2618, E-ISSN 1751-8563, Vol. 173, no 3, p. 228-253Article in journal (Refereed) Published
Abstract [en]

Compaction by vertically or horizontal oscillating probes increases not only the soil stiffness but also the horizontal effective stress. An important, but often neglected, consequence is that compaction also causes preloading of the soil. The change in horizontal stress following vibratory compaction can be measured independently by two in situ methods - a cone penetration test (CPT) and a flat dilatometer test (DMT). Values of sleeve resistance (CPT) and horizontal stress index (DMT) can be determined prior and after compaction. In this work, five case histories reported in the literature where different vibratory compaction methods were used (dynamic compaction, vibroflotation, VibroWing, TriStar and resonance compaction) were re-analysed. For each test site, the change in CPT cone resistance and sleeve resistance was determined and compared with the increase in horizontal stress index from DMTs. The preloading effect due to vibratory compaction was estimated using empirical correlations.

Place, publisher, year, edition, pages
Thomas Telford Ltd., 2020
Keywords
field testing & monitoring, landfills, stress analysis
National Category
Soil Science
Identifiers
urn:nbn:se:kth:diva-273877 (URN)10.1680/jgeen.19.00040 (DOI)000532801900005 ()2-s2.0-85084931676 (Scopus ID)
Note

QC 20200603

Available from: 2020-06-03 Created: 2020-06-03 Last updated: 2020-06-03Bibliographically approved
Wersäll, C., Åkesson, F. & Persson, A. (2019). Dynamic roller characteristics and CCC using automatic frequency control. In: : . Paper presented at IICTG 2019, Beijing, China, 16-17 April 2019.
Open this publication in new window or tab >>Dynamic roller characteristics and CCC using automatic frequency control
2019 (English)Conference paper, Published paper (Refereed)
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-248983 (URN)
Conference
IICTG 2019, Beijing, China, 16-17 April 2019
Note

QC 20190802

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-08-02Bibliographically approved
Massarsch, K. R. & Wersäll, C. (2019). Monitoring and Process Control of Vibratory Driving. Geotechnical Engineering, 50(3), 1-10
Open this publication in new window or tab >>Monitoring and Process Control of Vibratory Driving
2019 (English)In: Geotechnical Engineering, ISSN 0046-5828, Vol. 50, no 3, p. 1-10Article in journal (Refereed) Published
Abstract [en]

Vibrators are used increasingly in the foundation industry, primarily for installation of piles and sheet piles, but also for deep vibratory compaction. Fundamentals of vibratory driving are described that make it possible to choose vibrator performance parameters based on field monitoring and performance control. Variable frequency and amplitude vibrators have become available that make it possible to adapt the driving process to project-specific requirements. The components of modern electronic measuring systems are detailed that can be used to monitor, control, and document different aspects of vibratory driving. Two examples are presented-vibratory driving of sheet piles and resonance compaction-which show how the performance of vibrators and sheet piles can be analysed and adapted to meet specific requirements. By using the advanced monitoring and process control systems, the efficiency of vibratory driving is enhanced. From the retrieved parameters, a better understanding of the vibratory driving process is gained, which can be used to develop a valuable database.

Place, publisher, year, edition, pages
SOUTHEAST ASIAN GEOTECHNICAL SOC, 2019
Keywords
Vibrator, Pile, Sheet pile, Compaction, Ground vibration, Monitoring
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-261970 (URN)000487285300002 ()2-s2.0-85071300354 (Scopus ID)
Note

QC 20191014

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-11-04Bibliographically approved
Wersäll, C., Nordfelt, I. & Larsson, S. (2018). Effektivare packning med nya insikter. Bygg & Teknik (1), 44-45
Open this publication in new window or tab >>Effektivare packning med nya insikter
2018 (Swedish)In: Bygg & Teknik, ISSN 0281-658X, no 1, p. 44-45Article in journal (Other academic) Published
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-238695 (URN)
Note

QC 20181108

Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2019-10-30Bibliographically approved
Wersäll, C., Nordfelt, I. & Larsson, S. (2018). Resonant roller compaction of gravel in full-scale tests. Transportation Geotechnics, 14, 93-97
Open this publication in new window or tab >>Resonant roller compaction of gravel in full-scale tests
2018 (English)In: Transportation Geotechnics, ISSN 2214-3912, Vol. 14, p. 93-97Article in journal (Refereed) Published
Abstract [en]

Results from a recent study indicated that compaction by vibratory roller can be made more time- and energy-efficient by operating at a vibration frequency close to resonance. In this paper, the results are verified and the reduction in operating time is quantified by conducting detailed full-scale tests under realistic conditions at two frequencies: the standard operating frequency of the roller and a lower frequency slightly above resonance. Compaction was done in two tests per frequency with 16 passes in each test. The obtained compaction was quantified using a combination of measurement techniques, including laser levelling, nuclear density gauge and static plate load tests. The results confirm that the lower frequency is more efficient for compaction and that utilizing resonance in the roller-soil system can reduce the number of passes. In addition, lowering the frequency reduces energy consumption, environmental impact and machine wear. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Compaction, Frequency, Nuclear density gauge, Plate load test, Resonance, gravel, loading test, rock mechanics, vibration, wear
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-223120 (URN)10.1016/j.trgeo.2017.11.004 (DOI)000427928700010 ()2-s2.0-85034743044 (Scopus ID)
Funder
Swedish Transport Administration
Note

Export Date: 13 February 2018; Article; Correspondence Address: Wersäll, C.; Department of Civil and Architectural Engineering, KTH Royal Institute of TechnologySweden; email: carl.wersall@byv.kth.se. QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-04-11Bibliographically approved
Wersäll, C., Nordfelt, I. & Larsson, S. (2018). Roller compaction of rock-fill with automatic frequency control. In: Proceedings of the Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC): . Paper presented at Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC).
Open this publication in new window or tab >>Roller compaction of rock-fill with automatic frequency control
2018 (English)In: Proceedings of the Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC), 2018Conference paper, Oral presentation with published abstract (Refereed)
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-241178 (URN)
Conference
Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC)
Note

QC 20190117

Available from: 2019-01-15 Created: 2019-01-15 Last updated: 2019-01-17Bibliographically approved
Massarsch, R. & Wersäll, C. (2018). Vibratory plate resonance compaction. In: Proceedings of the Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC): . Paper presented at Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC).
Open this publication in new window or tab >>Vibratory plate resonance compaction
2018 (English)In: Proceedings of the Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC), 2018Conference paper, Oral presentation with published abstract (Refereed)
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-241179 (URN)
Conference
Anniversary Symposium – 40 Years of Roller Integrated Continuous Compaction Control (CCC)
Note

QC 20190121

Available from: 2019-01-15 Created: 2019-01-15 Last updated: 2019-01-21Bibliographically approved
Massarsch, K. R. & Wersäll, C. (2017). Acoustic soil and rock sounding. In: : . Paper presented at 6th International Workshop: In situ and laboratory characterization of OC subsoil. Poznan, Poland, June 26-27, 2017. (pp. 193-203).
Open this publication in new window or tab >>Acoustic soil and rock sounding
2017 (English)Conference paper, Published paper (Refereed)
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-238693 (URN)
Conference
6th International Workshop: In situ and laboratory characterization of OC subsoil. Poznan, Poland, June 26-27, 2017.
Note

QC 20181213

Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2018-12-13Bibliographically approved
Nejad Ghafar, A., Mentesidis, A., Draganovic, A. & Larsson, S. (2016). Ett nytt sätt att förbättra inträngnigs egenskaperna hos cementbaserat injekteringsbruk med momentant varierande tryck. Bygg & teknik (1), 17-22
Open this publication in new window or tab >>Ett nytt sätt att förbättra inträngnigs egenskaperna hos cementbaserat injekteringsbruk med momentant varierande tryck
2016 (Swedish)In: Bygg & teknik, ISSN 0281-658X, no 1, p. 17-22Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [sv]

Ett mycket viktig moment i samband med undermarksbyggande är tätning av konstruktioner för att hindra vatteninflöde eller ett eventuellt läckage av lagrade material i konstruktionen. Sedan mitten på 1980-talet har man på Kungliga tekniska högskolan (KTH) forskat kring injekteringen av sprickor i berg med varierande tryck för att förbättra inträngningsförmågan av cementbaserade bruk. I tidigare studier har man huvudsakligen undersökt effekten av högfrekventa oscillerande tryck på brukets inträngningsförmåga men den uppnådda förbättringen har visat sig vara relativt begränsad. I ett doktorandprojekt på KTH har vi genomfört en experimentell studie för att undersöka påverkan av istället ett lågfrekvent tryck med en momentan tryckförändering på brukets inträngningsförmåga. Resultaten har visat på en betydande förbättring av inträngningsförmågan hos bruket jämfört med injektering med konstant tryck. Projektet har finansierats av Stiftelsen Bergteknisk Forskning (BeFo), Svenska Byggbranschens Utvecklingsfond (SBUF) och Trafikverket.

Place, publisher, year, edition, pages
Stockholm: Förlags AB Bygg & teknik, 2016
National Category
Geotechnical Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-180703 (URN)
Funder
SBUF - Sveriges Byggindustriers UtvecklingsfondRock Engineering Research Foundation (BeFo)Swedish Transport Administration
Note

QC 20160222

Available from: 2016-01-20 Created: 2016-01-20 Last updated: 2017-11-22Bibliographically approved
Wersäll, C. (2016). Frequency Optimization of Vibratory Rollers and Plates for Compaction of Granular Soil. (Doctoral dissertation). KTH Royal Institute of Technology
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. p. 40
Series
TRITA-JOB PHD, ISSN 1650-9501 ; 1022
Keywords
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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7361-0729

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