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Toromanovic, JasminaORCID iD iconorcid.org/0000-0001-6562-1738
Publications (10 of 15) Show all publications
Toromanovic, J. (2024). Monitoring and Modelling of Embankment Dams. (Doctoral dissertation). Luleå: Luleå University of Technology
Open this publication in new window or tab >>Monitoring and Modelling of Embankment Dams
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Modelling can be used as a tool for prediction of the behaviour of embankment dams as a part of the dam safety work. It is advantageous to predict the performance and compare to measurements done, to obtain more knowledge about the dam behaviour, as these structures are complex and potential failures are hazardous. The research presented in this thesis covers parameter identification by backanalysis, interpretation of dam measurements and numerical predictions of dam behaviour. The research highlights the role of numerical modelling as a supportive tool in dam engineering, ratherthan a standalone technique. Two embankment dams were analysed in the research: a 45 metres high existing hydropower dam and a four metres high experimental dam built during the project.

The soil materials in an embankment dam vary significantly, as the zones in a dam have different functions. To create reliable numerical models, parameter values defining the stress-strain relationship of the materials are needed. Obtaining such information for existing embankment dams poses challenges, often due to limited available data and the potential risks associated with traditional field sampling methods. In previous research at Luleå University of Technology, inverse analysis was successfully applied to embankment dam calibration of finite element models against field measurements, by utilizing an optimisation code with a genetic algorithm for optimisation. Inverse analysis provides a non-destructive method for obtaining information about the stress-strain relationship of the material in a dam.

First, applications of inverse analysis are exemplified on an existing embankment dam. The study investigates the impact on the inverse analysis methodology when errors occur in the field measurements. The employed genetic algorithm showed its robustness when dealing with errors, this is important since errors are likely to occur in field measurements. Thereafter, the study examined the usage of parameters identified through inverse analysis in predictions of deformations when a stabilising berm was constructed on the downstream shoulder. The predicted deformations were compared to deformations from inclinometer measurements. The trend of the measured deformations was replicated in the numerical model, and the magnitudes were in the right order. The study shows that predicting future dam behaviour based on results from inverse analysis can be done reasonably well in this case.

Second, the mechanical behaviour of an experimental embankment dam is interpreted and modelled. Monitoring of pore pressure was done with transducers that were installed at different levels covering the whole core and parts of the filters. Measurements were performed continuously. The response of pore pressure in the core, during impoundment and operation, are focused on. A significant delay of the saturation front was observed, as the pore pressure in the bottom of the downstream part of the core was not building up as expected during impoundment and operation. Fully-coupled numerical analyses were performed, in order to better understand the conditions of the core in the experimental dam. The core was initially assumed to be homogeneous, but the numerical results showed poor agreement with the observed behaviour from field. By further analysing the measurements and modelling, the experimental dam was found to be non-homogeneous, even though it was built under very controlled conditions. Variations in the hydraulic conductivity in the dam core were therefore introduced in the numerical model. The hydraulic conductivity changed with height in the dam, was different in the vertical and horizontal direction and was also changing with time at specific places in the core. With these numerical adjustments better correlations against measurements were obtained, compared to the homogeneous case, indicating that homogeneous conditions are not suitable for the core. The study also showed that the values of parameters obtained from laboratory testing are not suitable for the whole core, as the conditions assumed in laboratory do not correspond to the prevailing field conditions.

Measurements of the strain development in the bottom of the embankment dam was done by fibre optics. The settlements in the dam body after construction are captured, mainly as areas of higher lateral strain at the toes of the dam. The 1% sloping foundation towards the downstream side is captured. The measurements show that more shear is activated at the downstream side. Impoundment causes the largest strains, it can be observed that the strains vary in the different dam zones the bottom of the dam body.

In summary, the research presented in this thesis has shown how numerical modelling can be used as support in dam engineering, when combined with monitoring data. Values of parameters that would have been difficult to retrieve otherwise are obtained by inverse analysis, making it possible to perform more reliable predictions. The modelling has also helped to explain unexpected behaviour from monitoring of pore pressure. When the experimental dam was built, it was expected that the core would be homogeneous. The monitoring of the dam and the numerical modelling revealed that the core was non-homogeneous. The experimental dam is small, and it was constructed under very controlled forms. Therefore, it is reasonable to assume that it would be difficult to construct a homogeneous core in a real, large embankment dams. This is an important finding in the thesis, which can influence both how dams should be numerically modelled as well as how dam safety assessments during first impoundment and the beginning of the operation phase should be done.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-104920 (URN)978-91-8048-517-3 (ISBN)978-91-8048-518-0 (ISBN)
Public defence
2024-05-28, E632, Luleå University of Technology, Luleå, 13:00 (English)
Opponent
Supervisors
Available from: 2024-04-02 Created: 2024-03-28 Last updated: 2024-05-07Bibliographically approved
Lagerlund, J., Viklander, P., Laue, J. & Toromanovic, J. (2023). Methodology for remediation grouting in embankment dams -grouting with a new type of non-hardening grout. In: : . Paper presented at 91st Annual ICOLD Meeting, June 13-14, 2023, Gothenburg, Sweden. , Article ID 30.
Open this publication in new window or tab >>Methodology for remediation grouting in embankment dams -grouting with a new type of non-hardening grout
2023 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The core soil of an embankment dam can be exposed to deteriorating processes, i.e., different kinds of internal erosion due to high hydraulic gradients, disadvantageous particle size distribu-tion, too coarse-grained filters or built-in defects. During internal erosion, fines from the core soil are washed out by the seepage, decreasing the impervious properties of the core. If the internal erosion process is discovered in time, drilling and grouting can be performed to stop the erosion. During drilling and grouting, eroded material from the core soil is replaced.

In this paper, the methodology: “Identification – Localization – Characterization – Remediation” has been proposed. The methodology was tested on a large-scale embankment dam in a laboratory environment. The dam had a central core of moraine and was built inside a watertight concrete structure so a reservoir of water could be created upstream the dam. The left abutment of the dam had higher seepage rates than the rest of the dam and therefore had to be remediated.

During the identification and localization phase, a 10 x 10 cm horizontal, high hydraulic conduc-tivity zone through the core soil was identified and localized at the left abutment at 1 m depth. During drilling at the abutment, it was found that the core soil beneath the damage had become more wet compared to when built. The remedial method used was compaction grouting with a new developed type of non-hardening grout material. The grouting pressures equaled the height of the vertical grout material column with an additional pressure of ~50 kPa to compensate for frictional losses during injection. The grout material was delivered via a novel pipe system where water and air were allowed to be drained. The seepage was lowered by 44 % directly after grout-ing and 60% four months after grouting.

National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-95227 (URN)
Conference
91st Annual ICOLD Meeting, June 13-14, 2023, Gothenburg, Sweden
Available from: 2023-01-11 Created: 2023-01-11 Last updated: 2024-01-29Bibliographically approved
Toromanovic, J., Mattsson, H., Knutsson, S., Laue, J. & Bernstone, C. (2022). Mechanical behaviour of an experimental embankment dam during initial impoundment: [Comportement mécanique d'un barrage en remblai expérimental lors de la mise en eau initiale]. In: M. Rahman; M. Jaksa (Ed.), Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering: . Paper presented at 20th International Conference on Soil Mechanics and Geotechnical Engineering 2022 (ICSMGE 2022), Sydney, Australia, May 1-5, 2022 (pp. 1217-1222). Australian Geomechanics Society
Open this publication in new window or tab >>Mechanical behaviour of an experimental embankment dam during initial impoundment: [Comportement mécanique d'un barrage en remblai expérimental lors de la mise en eau initiale]
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2022 (English)In: Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering / [ed] M. Rahman; M. Jaksa, Australian Geomechanics Society , 2022, p. 1217-1222Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Australian Geomechanics Society, 2022
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-92606 (URN)
Conference
20th International Conference on Soil Mechanics and Geotechnical Engineering 2022 (ICSMGE 2022), Sydney, Australia, May 1-5, 2022
Funder
Energy ResearchLuleå University of TechnologyKTH Royal Institute of TechnologyChalmers University of TechnologyUppsala UniversityLund University
Note

Funder: Swedish Hydropower Centre - SVC

ISBN för värdpublikation: 978-0-9946261-4-1

Available from: 2022-08-22 Created: 2022-08-22 Last updated: 2023-07-06Bibliographically approved
Toromanovic, J., Viklander, P., Mattsson, H. & Laue, J. (2022). Monitoring of an experimental embankment dam during impoundment and operation. In: Andrew M. Ridley (Ed.), Proceedings of the 11th International Symposium on Field Monitoring in Geomechanics: . Paper presented at 11th International Symposium on Field Monitoring in Geomechanics (ISFMG2022), London, United Kingdom, September 4-7, 2022. International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)
Open this publication in new window or tab >>Monitoring of an experimental embankment dam during impoundment and operation
2022 (English)In: Proceedings of the 11th International Symposium on Field Monitoring in Geomechanics / [ed] Andrew M. Ridley, International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) , 2022Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), 2022
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-103283 (URN)
Conference
11th International Symposium on Field Monitoring in Geomechanics (ISFMG2022), London, United Kingdom, September 4-7, 2022
Projects
Swedish Hydropower Centre - SVC
Funder
Swedish Energy AgencySwedish National GridLuleå University of TechnologyKTH Royal Institute of TechnologyChalmers University of TechnologyUppsala UniversityLund University
Available from: 2023-12-11 Created: 2023-12-11 Last updated: 2024-04-26Bibliographically approved
Toromanovic, J., Mattsson, H., Laue, J. & Knutsson, S. (2021). A Non-Destructive Parameter Identification for an Embankment Dam. In: Gabriella Bolzon, Donatella Sterpi, Guido Mazzà, Antonella Frigerio (Ed.), Numerical Analysis of Dams: Proceedings of the 15th ICOLD International Benchmark Workshop. Paper presented at 15th ICOLD International Benchmark Workshop, 9-11 September, 2019, Milano, Italy (pp. 889-899). Springer Nature
Open this publication in new window or tab >>A Non-Destructive Parameter Identification for an Embankment Dam
2021 (English)In: Numerical Analysis of Dams: Proceedings of the 15th ICOLD International Benchmark Workshop / [ed] Gabriella Bolzon, Donatella Sterpi, Guido Mazzà, Antonella Frigerio, Springer Nature, 2021, p. 889-899Conference paper, Published paper (Refereed)
Abstract [en]

When performing predictions of future behaviour and assessments of the safety for embankment dams, numerical modelling if often needed as support. For embankment dams a usual issue is to obtain values of the material parameters for the material in the dam. Sampling is not easily performed, and it could also negatively affect the performance and safety of the dam. One way to determine values of the material parameters is to create a digital copy of the dam by utilizing so called inverse analysis. The created numerical model is calibrated towards field measurements. To make the reality and the numerical model correspond to each other, the values of material parameters for constitutive models are calibrated. The calibration is done by an automatized process. Further, the calibrated model could be used in predictions of future dam behaviour. The methodology has been shown to work for field data containing errors of a usual magnitude.

Place, publisher, year, edition, pages
Springer Nature, 2021
Series
Lecture Notes in Civil Engineering, ISSN 2366-2557, E-ISSN 2366-2565 ; 91
Keywords
Embankment dam, Inverse analysis, Digital twin, Predictions Noise
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-76459 (URN)10.1007/978-3-030-51085-5_51 (DOI)2-s2.0-85096621345 (Scopus ID)
Conference
15th ICOLD International Benchmark Workshop, 9-11 September, 2019, Milano, Italy
Note

ISBN för värdpublikation: 978-3-030-51084-8, 978-3-030-51085-5

Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2022-06-30Bibliographically approved
Bernstone, C., Lagerlund, J., Toromanovic, J. & Juhlin, C. (2021). Deformationer och portryck i en experimentell fyllningsdamm: Mätningar under dämningsupptag. Energiforsk
Open this publication in new window or tab >>Deformationer och portryck i en experimentell fyllningsdamm: Mätningar under dämningsupptag
2021 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
Energiforsk, 2021. p. 52
Series
Rapport ; 2021:772
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:ltu:diva-93368 (URN)978-91-7673-772-9 (ISBN)
Available from: 2022-09-30 Created: 2022-09-30 Last updated: 2023-09-05Bibliographically approved
Toromanovic, J., Mattsson, H., Knutsson, S. & Laue, J. (2020). Digitala tvillingar av fyllningsdammar. Bygg och Teknik (1), 36-37
Open this publication in new window or tab >>Digitala tvillingar av fyllningsdammar
2020 (Swedish)In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, no 1, p. 36-37Article in journal (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Förlags AB Bygg & teknik, 2020
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-80346 (URN)
Note

Godkänd;2020;Nivå 0;2020-08-17 (alebob)

Available from: 2020-08-10 Created: 2020-08-10 Last updated: 2022-09-15Bibliographically approved
Lagerlund, J., Toromanovic, J., Dahlin, T., Juhlin, C. & Johansson, S. (2020). Testdamm i Älvkarleby för skadedetektering. Bygg och Teknik (1), 31-34
Open this publication in new window or tab >>Testdamm i Älvkarleby för skadedetektering
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2020 (Swedish)In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, no 1, p. 31-34Article in journal (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Förlags AB Bygg & teknik, 2020
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-80345 (URN)
Note

Godkänd;2020;Nivå 0;2020-08-18 (alebob)

Available from: 2020-08-10 Created: 2020-08-10 Last updated: 2023-09-05Bibliographically approved
Toromanovic, J., Mattsson, H., Knutsson, S. & Laue, J. (2019). En icke-destruktiv metod för bestämning av värden på materialparametrar i fyllningsdammar. In: : . Paper presented at Grundläggningsdagen 2019, 14 Mars 2019, Älvsjö, Sweden.
Open this publication in new window or tab >>En icke-destruktiv metod för bestämning av värden på materialparametrar i fyllningsdammar
2019 (Swedish)Conference paper, Published paper (Other (popular science, discussion, etc.))
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-73459 (URN)
Conference
Grundläggningsdagen 2019, 14 Mars 2019, Älvsjö, Sweden
Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2023-06-27
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
Place, publisher, year, edition, pages
INTERNATIONAL COMMISSION ON LARGE DAMS, 2018
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: 2021-03-09Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6562-1738

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