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Mattsson, Hans
Publications (10 of 41) Show all publications
Toromanovic, J., Knutsson, S., Mattsson, H. & Laue, J. (2018). Utvärdering av dammars tillstånd. SwedCOLD Nyhetsbrev (2), pp. 14-15
Open this publication in new window or tab >>Utvärdering av dammars tillstånd
2018 (Swedish)In: SwedCOLD Nyhetsbrev, no 2, p. 14-15Article in journal, News item (Other (popular science, discussion, etc.)) Published
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-71380 (URN)
Available from: 2018-10-30 Created: 2018-10-30 Last updated: 2018-12-05Bibliographically approved
Zardari, M. A., Mattsson, H., Knutsson, S. & Ormann, L. (2017). Comparison of three-dimensional and two-dimensional axisymmetric finite element analyses of a corner section of a tailings dam (ed.). Scientia Iranica. International Journal of Science and Technology, 24(5), 2320-2331, Article ID 9.
Open this publication in new window or tab >>Comparison of three-dimensional and two-dimensional axisymmetric finite element analyses of a corner section of a tailings dam
2017 (English)In: Scientia Iranica. International Journal of Science and Technology, ISSN 1026-3098, E-ISSN 2345-3605, Vol. 24, no 5, p. 2320-2331, article id 9Article in journal (Refereed) Published
Abstract [en]

This paper presents three dimensional (3D) and two dimensional (2D) axisymmetric finite element analyses of a corner of a tailings dam. The analyses were performed to: (i) locate tension and/or low compression zones and to evaluate slope stability during sequential raising of the dam corner, and (ii) find whether the results of 2D axisymmetric analyses can be reliable for the dam corner. The corner is a potentially weak section of the dam where tension and/or low compression zones may develop. Development of such zones inside the dam corner can lead to cracks and initiation of internal erosion. The results of both the 3D and 2D axisymmetric analyses indicated that (i) tension and/or low compression zones were located in vicinity of surface of the dam corner mainly above the phreatic level, and (ii) the dam corner is stable up to the planned height if it is gradually strengthened with rockfill berms on the downstream side. The results of 2D axisymmetric analyses showed a fairly good agreement with those of 3D analyses. It is concluded that 2D axisymmetric analyses are appropriate for this dam corner. This implies that significant computational time can be saved by utilizing 2D analyses instead of 3D analyses.

Place, publisher, year, edition, pages
Tehran, Iran: Elsevier, 2017
Keywords
Tailings dam, Corner, Finite element analysis, Internal erosion, Consolidation, Slope stability, Gruvdammar, Hörn, Finita element analys, Inre erosion, Konsolidering, Slänt stabilitet
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-13666 (URN)10.24200/sci.2017.4157 (DOI)000415358300012 ()2-s2.0-85032617267 (Scopus ID)cec5042b-a0b7-47de-8452-4b157d1f418c (Local ID)cec5042b-a0b7-47de-8452-4b157d1f418c (Archive number)cec5042b-a0b7-47de-8452-4b157d1f418c (OAI)
Note

Validerad;2017;Nivå 2;2017-10-31 (rokbeg)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-10-10Bibliographically approved
Toromanovic, J., Mattsson, H. & Laue, J. (2017). Effects of Measurement Error on the Genetic Algorithm in Soil Parameter Identification for an Earth- and Rockfill Dam. In: ICSMGE 2017: 19th International Conference on Soil Mechanics and Geotechnical Engineering. Paper presented at 19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017, Seoul, South Korea, 17-22 September 2017 (pp. 2443-2446). 19th ICSMGE Secretariat
Open this publication in new window or tab >>Effects of Measurement Error on the Genetic Algorithm in Soil Parameter Identification for an Earth- and Rockfill Dam
2017 (English)In: ICSMGE 2017: 19th International Conference on Soil Mechanics and Geotechnical Engineering, 19th ICSMGE Secretariat , 2017, p. 2443-2446Conference paper, Published paper (Refereed)
Abstract [en]

It is usually difficult to determine values for soil parameter values in earth- A nd rockfill dams by traditional methods. Field sampling is not easily performed, especially in the impervious parts, since the performance and safety of the dam structure may be affected in an unfavourable way. Therefore other methods, preferably non-destructive, are needed to investigate the mechanical behaviour. Inverse analysis has been utilised to identify soil parameter values for an earth- A nd rockfill dam. An error function and a genetic search algorithm were combined with a finite element software to perform the analysis. The model parameters in the chosen constitutive model were calibrated until the horizontal deformations corresponded to the horizontal inclinometer deformations. Errors or irregularities in field measurements can occur, for instance based on the accuracy of the equipment. In this study, the performance of the genetic algorithm was investigated, when applied to identify soil parameters for a dam. Added perturbations to simulated inclinometer data are randomly generated within a chosen interval of error. The results showed that the genetic algorithm found a minimum for the error function even though the field data was substantially perturbed. Errors up to 10% were shown to have minor impact

Place, publisher, year, edition, pages
19th ICSMGE Secretariat, 2017
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-64847 (URN)2-s2.0-85045198380 (Scopus ID)
Conference
19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017, Seoul, South Korea, 17-22 September 2017
Available from: 2017-07-10 Created: 2017-07-10 Last updated: 2019-01-18Bibliographically approved
Toromanovic, J., Mattsson, H. & Laue, J. (2017). Effects of random measurement error on the genetic algorithm in soil parameter identification for an earth- and rockfill dam. In: : . Paper presented at 6th International Young Geotechnical Engineers’ Conference (iYGEC6), Seoul, Republic of Korea, 16 – 17 September 2017.
Open this publication in new window or tab >>Effects of random measurement error on the genetic algorithm in soil parameter identification for an earth- and rockfill dam
2017 (English)Conference paper, Published paper (Other academic)
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-65844 (URN)
Conference
6th International Young Geotechnical Engineers’ Conference (iYGEC6), Seoul, Republic of Korea, 16 – 17 September 2017
Available from: 2017-09-27 Created: 2017-09-27 Last updated: 2017-11-24Bibliographically approved
Gunnvard, P., Mattsson, H. & Laue, J. (2017). Evaluation of triangular pile arrangement through a numerical study of the light embankment piling method. In: : . Paper presented at 6th International Young Geotechnical Engineers’ Conference (iYGEC6), Seoul, Republic of Korea, 16 – 17 September 2017 (pp. 71-72).
Open this publication in new window or tab >>Evaluation of triangular pile arrangement through a numerical study of the light embankment piling method
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Embankment piling is a widely used foundation method in geotechnical engineering and the design is mostly based on empirical studies found on experimental or field evidents. Several studies have been conducted to capture the behaviour of embankment piles by means of numerical models. One of the issues is to simulate the arching effect between the piles. This has raised the question of the optimum pile arrangement. Along the northern coast of Sweden, where soft soil types and dense woodlands are common, timber piles have often been used in piled road and railway embankments. The pile group is designed as a semi-floating deep foundation in soft soil, where the piles are resting on top of the locally common firm glacial till bottom layer, naming the method light embankment piling. The Swedish design guidelines recently changed from a square to a triangular pile arrangement. However, the motivation of the changed lacked research which raised the question of optimal pile arrangement and centre-to-centre pile distance. This project aims to optimise the light embankment piling method through numerical analysis, verified by field and laboratory experiments. The optimisation will mainly focus on pile arrangement and centre-to-centre pile distance.

Keywords
piled embankment, timber piles, triangular arrangement, sulphide soil, finite element method
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-65825 (URN)
Conference
6th International Young Geotechnical Engineers’ Conference (iYGEC6), Seoul, Republic of Korea, 16 – 17 September 2017
Projects
Optimal träpålning
Funder
Swedish Transport Administration
Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2018-03-13Bibliographically approved
Auchar Zardari, M., Mattsson, H., Knutsson, S., Khalid, M. S., Ask, M. & Lund, B. (2017). Numerical Analyses of Earthquake Induced Liquefaction and Deformation Behaviour of an Upstream Tailings Dam. Advances in Materials Science and Engineering, 2017, Article ID 5389308.
Open this publication in new window or tab >>Numerical Analyses of Earthquake Induced Liquefaction and Deformation Behaviour of an Upstream Tailings Dam
Show others...
2017 (English)In: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, Vol. 2017, article id 5389308Article in journal (Refereed) Published
Abstract [en]

Much of the seismic activity of northern Sweden consists of micro-earthquakes occurring near postglacial faults. However, larger magnitude earthquakes do occur in Sweden, and earthquake statistics indicate that a magnitude 5 event is likely to occur once every century. This paper presents dynamic analyses of the effects of larger earthquakes on an upstream tailings dam at the Aitik copper mine in northern Sweden. The analyses were performed to evaluate the potential for liquefaction and to assess stability of the dam under two specific earthquakes: a commonly occurring magnitude 3.6 event and a more extreme earthquake of magnitude 5.8. The dynamic analyses were carried out with the finite element program PLAXIS using a recently implemented constitutive model called UBCSAND. The results indicate that the magnitude 5.8 earthquake would likely induce liquefaction in a limited zone located below the ground surface near the embankment dikes. It is interpreted that stability of the dam may not be affected due to the limited extent of the liquefied zone. Both types of earthquakes are predicted to induce tolerable magnitudes of displacements. The results of the postseismic slope stability analysis, performed for a state after a seismic event, suggest that the dam is stable during both the earthquakes

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2017
Keywords
tailings, dams, earth-quake, dynamic loading, stability
National Category
Geotechnical Engineering Geochemistry
Research subject
Soil Mechanics; Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-62037 (URN)10.1155/2017/5389308 (DOI)000395137300001 ()2-s2.0-85014464790 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-02-16 (andbra)

Available from: 2017-02-16 Created: 2017-02-16 Last updated: 2018-11-20Bibliographically approved
Gunnvard, P., Mattsson, H. & Laue, J. (2017). Numerical Analysis of the Mechanical Behaviour of Light Embankment Piling. In: Woojin Lee, Jong-Sub Lee, Hyun-Ki Kim, Dong-Soo Kim (Ed.), ICSMGE 2017: 19th International Conference on Soil Mechanics and Geotechnical Engineering. Paper presented at 19th International Conference on Soil Mechanics and Geotechnical Engineering (19th ICSMGE), Seoul, September 17-22, 2017 (pp. 749-752). 19th ICSMGE Secretariat
Open this publication in new window or tab >>Numerical Analysis of the Mechanical Behaviour of Light Embankment Piling
2017 (English)In: ICSMGE 2017: 19th International Conference on Soil Mechanics and Geotechnical Engineering / [ed] Woojin Lee, Jong-Sub Lee, Hyun-Ki Kim, Dong-Soo Kim, 19th ICSMGE Secretariat , 2017, p. 749-752Conference paper, Published paper (Refereed)
Abstract [en]

2D and 3D finite element simulations were performed to investigate the mechanical behaviour of the light embankmentpiling method as a pre-study to further develop a new Swedish design guideline. The light embankment piling method is used forsulphide soils and utilises timber piles as its key feature. The Swedish Transport Administration (Trafikverket) recently changed thenational standard of the light embankment piling method from the use of a square to a triangular pile arrangement, based on a theory thata triangular arrangement creates more stable arches in between the piles. The objective with the present study is to evaluate the currentstandard by modelling setups with square and triangular pile arrangements with varying centre-to-centre distance. Both, completelyfloating and semi-floating pile groups were modelled here. The evaluation mainly focused on comparing embankment settlements as wellas axial forces in the piles. No evident difference in the mechanical behaviour between the triangular and the square piling pattern wasfound. The maximum allowed centre-to-centre distance can potentially be increased from 1.2 to 1.5m; resulting in approximately 30% fewer piles used.

Place, publisher, year, edition, pages
19th ICSMGE Secretariat, 2017
Keywords
piled embankment, timber piles, triangular arrangement, sulphide soil, finite element method, PLAXIS 3D
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-65826 (URN)2-s2.0-85045246771 (Scopus ID)
Conference
19th International Conference on Soil Mechanics and Geotechnical Engineering (19th ICSMGE), Seoul, September 17-22, 2017
Projects
Optimal träpålning
Funder
Swedish Transport Administration
Note

Alternativ titel:  Analyse numérique du comportement mécanique des remblais sur pieux.

Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2018-04-24Bibliographically approved
Toromanovic, J., Mattsson, H., Knutsson, S. & Laue, J. (2017). Use of parameters identified by inverse analysis in an earth- and rockfill dam application. In: 85th Annual Meeting  of International Commission on Large Dams: . Paper presented at 85th Annual Meeting of International Commission on Large Dams, Prague, Czech Republic, July 3-7 2017.
Open this publication in new window or tab >>Use of parameters identified by inverse analysis in an earth- and rockfill dam application
2017 (English)In: 85th Annual Meeting  of International Commission on Large Dams, 2017Conference paper, Published paper (Refereed)
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-64841 (URN)
Conference
85th Annual Meeting of International Commission on Large Dams, Prague, Czech Republic, July 3-7 2017
Available from: 2017-07-10 Created: 2017-07-10 Last updated: 2017-11-24Bibliographically approved
Toromanovic, J., Mattsson, H., Knutsson, S. & Sipola, J. (2016). Effects on an earth and rockfill dam undergoing dam safety measures (ed.). Paper presented at Nordic Geotechnical Meeting : Challanges in Nordic Geotechnics 25/05/2016 - 27/05/2016. Paper presented at Nordic Geotechnical Meeting : Challanges in Nordic Geotechnics 25/05/2016 - 27/05/2016.
Open this publication in new window or tab >>Effects on an earth and rockfill dam undergoing dam safety measures
2016 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Over the lifetime of a dam several measures are usually taken in order to assure the stability and the performance of the dam. In this case a hydropower dam in Northern Sweden is in need of dam safety measures. The question arose, what consequences there might be when such measures are performed. In order to estimate these effects, simulations have been carried out in the finite element programme PLAXIS 2D. Thereby, the deformations and the stability of the dam for the planned work can be evaluated. The performed simulations are based upon previously conducted research at Luleå University of Technology, where soil parameters in the investigated dam were identified by a method of inverse analysis.Three sections have been analysed: A, B and C. In section A increasing pore water pressure has been observed at the downstream side of the dam. Thereby it has been concluded that a new drainage system is needed; new trenches of large size are to be excavated. In section B new toe berms are planned, due to the requirement that the dam should be able to divert leakage without erosion occurring at the dam toe. This contains soil material that might degrade when stresses are increased, with intensified deformations as a consequence. In section C a new berm is to be constructed, before this can be conducted an excavation is performed at the toe of the dam.The results have shown deformations of an acceptable magnitude and factors of safety that indicate conditions for the planned dam safety measures. Numerical values of deformations and factors of safety can be utilised as an attempt to establish alarm values for the stability of the dam. The finite element method is a useful tool for this kind of evaluation.

National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-27544 (URN)10a9fc0c-d076-4e3c-a37e-9308357da894 (Local ID)10a9fc0c-d076-4e3c-a37e-9308357da894 (Archive number)10a9fc0c-d076-4e3c-a37e-9308357da894 (OAI)
Conference
Nordic Geotechnical Meeting : Challanges in Nordic Geotechnics 25/05/2016 - 27/05/2016
Note
Godkänd; 2016; 20160607 (jastor)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Axelsson, K. & Mattsson, H. (2016). Geoteknik (ed.). Paper presented at . Lund: Studentlitteratur AB
Open this publication in new window or tab >>Geoteknik
2016 (Swedish)Book (Refereed)
Abstract [sv]

Geoteknik behandlar jordmaterials mekaniska och tekniska egenskaper, kunskaper som är av betydelse för utförandet av en säker och stabil grundläggning av byggnader och anläggningar. Ämnet stödjer sig på kvartärgeologin, d.v.s. de lösa jordarternas geologi, samt på mekaniken och främst då deformerbara fasta kroppars mekanik. Geoteknik är ett semiempiriskt ämne, d.v.s. provning och erfarenhet ligger också till grund för de metoder som tillämpas.Boken är uppdelad i fyra huvuddelar. I del A ges en introduktion till ämnet samt en återblick på byggnadsgeologin (kvartärgeologin). I del B behandlas jordmaterialläran, d.v.s. jords kemiska och fysikaliska egenskaper vad gäller beståndsdelar, klassificering och strukturell uppbyggnad. Del C behandlar jordmekaniken, d.v.s. mekaniska och hållfasthetstekniska egenskaper hos jord. I del D tillämpas de inhämtade kunskaperna på viktiga geotekniska problemområden såsom bestämning av spännings­tillstånd i jordprofiler, beräkning av byggnaders och anläggningars sättning och geotekniska bärförmåga samt bestämning av jordtryck mot stödkonstruktioner och av jordslänters stabilitet.Geoteknik vänder sig i första hand till studenter på de tekniska hög­s­kolornas program för väg- och vattenbyggnad och samhällsbyggnad samt på högskolornas byggingenjörsprogram.

Place, publisher, year, edition, pages
Lund: Studentlitteratur AB, 2016. p. 464
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-16610 (URN)9307a5c6-98a5-459e-806b-754d8b5d52fd (Local ID)978-91-44-08072-7 (ISBN)9307a5c6-98a5-459e-806b-754d8b5d52fd (Archive number)9307a5c6-98a5-459e-806b-754d8b5d52fd (OAI)
Note
Godkänd; 2016; 20160823 (hmat)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
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