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Mohammad, M. E., Al-Ansari, N., Knutsson, S. & Laue, J. (2020). A numerical study of pumping effects on flow velocity distributions in Mosul Dam reservoir using the HEC‐RAS model. Lakes & Reservoirs: Research and Management
Open this publication in new window or tab >>A numerical study of pumping effects on flow velocity distributions in Mosul Dam reservoir using the HEC‐RAS model
2020 (English)In: Lakes & Reservoirs: Research and Management, ISSN 1320-5331, E-ISSN 1440-1770Article in journal (Refereed) Epub ahead of print
Abstract [en]

Water flow direction and velocity affect and controls erosion, transport and deposi- tion of sediment in rivers, reservoirs and different hydraulic structures. One of the main structures affected is pumping stations within the dams wherein the velocity distribution near the station intake is disturbed. The two-dimensional (2-D) HEC-RAS 5.01 model was utilized to study, analyse and evaluate the effects of pumping rates and flow depth on the flow velocity distribution, flow stream power and their effects in the Mosul Dam reservoir. The pumping station was considered as a case study. The station is suffering from sediment accumulation around, and in, its intake and suction pipes. The main inflow sources to the reservoir are the Tigris River and run-off from the valleys within its basin. The reservoir was divided into two parts for the present study, including the upper part near the pumping station (analysed as a two-dimen- sional zone), while the lower part was analysed as a one-dimensional flow to reduce the simulation period computation time (1986–2011). Different operation plans (i.e. pumping rate and water depth) were considered. The results of the depth-averaged velocity model indicated that when the pumping station was working at a range from the designed full capacity (100% to 25% of its full capacity), the maximum flow ve- locity increased from 75 to 4 times the normal velocity when there is no pumping dependent on pumping rate and flow depth. For the same operation plans, the flow stream power varied from around zero values to 400 times at full pumping capacity and low flow depth. For sediment routing along the reservoir, the considered statisti- cal criteria indicated the model performance in estimating the total sediment load deposition and invert bed level is much better than in the case of erosion and deposition areas for different considered bed sections of the reservoir.

Place, publisher, year, edition, pages
USA: John Wiley & Sons, 2020
Keywords
pumping station, sediment concentration, stream power, velocity distribution
National Category
Geotechnical Engineering
Research subject
Soil Mechanics; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77542 (URN)10.1111/lre.12306 (DOI)
Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2020-02-04
Rothhämel, M., Rosenberg, M. & Laue, J. (2020). Anwendbarkeit oberflächennaher Baugrundstabilisierung mit hydraulischen Bindemitteln in Schweden unter Berücksichtigung des Einflusses von Frost-Tau-Wechseln auf die Tragfähigkeit stabilisierter Tone. Bauingenieur: Zeitschrift für das gesamte Bauwesen, 95(2)
Open this publication in new window or tab >>Anwendbarkeit oberflächennaher Baugrundstabilisierung mit hydraulischen Bindemitteln in Schweden unter Berücksichtigung des Einflusses von Frost-Tau-Wechseln auf die Tragfähigkeit stabilisierter Tone
2020 (German)In: Bauingenieur: Zeitschrift für das gesamte Bauwesen, ISSN 0005-6650, E-ISSN 1436-4867, Vol. 95, no 2Article in journal (Refereed) Accepted
Abstract [en]

Applicability of near-surface soil improvement with hydraulic binders in Sweden considering the influence of freeze/thaw-cycles on the strength of stabilised clay

Fine-grained soils are often not suitable as subsoil for roads or railways or other large-scale construction because of their frost susceptibility. The engineering properties as well as the frost durability of such soils can be improved by mixing with hydraulic binder, which is used in countries with moderate climate. This paper presents a laboratory study of a Swedish clay soil stabilised with a by-product originated hydraulic binder. The procedure and interpretation of the study considers the country-specific boundary conditions of Sweden. The study contains two different binder contents (4 and 7%) and unstabilised clay, three different curing times (14, 28 and 90 days) before twelve freeze/thaw-cycles as well as a subsequent curing time (28 days). The curing conditions were adopted to cold climate, i. e. +4°C. The unconfined compressive strength (UCS) was used as a measure of strength. The results show that this soil gains strength by stabilisation with this binder even at this cold curing temperature and that an increase is still remarkable after freeze/thaw-cycles. The time after freeze/thaw-cycles may allow a continued curing which is indicated by a somewhat higher strength.

Abstract [de]

Aufgrund ihrer Frostempfindlichkeit eignen sich feinkörnige Böden oftmals nicht als Unterbau für Straßen oder Bahntrassen. Die Eigenschaften dieser Böden können durch Stabilisierung mit hydraulischen Bindemitteln deutlich verbessert werden, was in Ländern mit warmgemäßigtem Klima wie Deutschland üblich ist. In dem vorliegenden Beitrag wird eine Laborstudie an einem schwedischen Ton präsentiert, der mit einem Recyclingbindemittel stabilisiert wurde. Die Durchführung und Interpretation der Studie berücksichtigt landestypische Randbedingungen von Schweden. Die Studie umfasst zwei verschiedene Bindemittelgehalte (4 und 7%) sowie unbehandelten Ton, drei verschiedene Erhärtungszeiten (14, 28 und 90 Tage) vor zwölf Frost- Tau-Wechseln sowie eine anschließende Erhärtungszeit. Die Bedingungen während des Erhärtens entsprachen kalten Klimaverhältnissen, d. h. +4°C. Als Maß für die Festigkeitsentwicklung wurde die einaxiale Druckfestigkeit verwendet. Die Ergebnisse zeigen, dass die Festigkeit des Bodens durch Stabilisierung deutlich zunimmt und dass eine Zunahme auch nach Frost-Tau-Wechseln sichtbar bleibt. Die Nacherhärtungszeit könnte eine weitere Erhärtung ermöglichen, was die etwas höheren Festigkeitswerte vermuten lassen.

Keywords
research and development, laboratory study, road, railway, subbase, soil improvement, stabilisation, hydraulic binder, freeze-thaw, Forschung und Entwicklung, Verkehrsbau, Bodenverbesserung, Dauerhaftigkeit
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77434 (URN)
Funder
Swedish Research Council FormasSwedish Transport Administration
Available from: 2020-01-16 Created: 2020-01-16 Last updated: 2020-01-16
Al-Jabban, W., Laue, J., Knutsson, S. & Al-Ansari, N. (2020). Briefing: Common laboratory procedures to prepare and cure stabilised soil specimens: a short review. Geotechnical Research, 7(1), 1-8
Open this publication in new window or tab >>Briefing: Common laboratory procedures to prepare and cure stabilised soil specimens: a short review
2020 (English)In: Geotechnical Research, ISSN 2052-6156, Vol. 7, no 1, p. 1-8Article in journal (Refereed) Epub ahead of print
Abstract [en]

Soil stabilisation is used extensively to improve the physical and mechanical properties of soils to achieve the desired strength and durability properties. During the design process, laboratory investigation is conducted firstly to obtain an enhancement in soil strength and stiffness, in addition to the type and amount of binder required. The methods of preparing and curing specimens of soil–binder mixtures directly influence the properties of the stabilised soils. The most common laboratory protocols used for preparing and curing the specimens of stabilised soil are presented in this short review. The review focuses on several aspects such as homogenisation of the natural soil, mixing type and duration, mould type, moulding techniques and curing time and condition. This review can assist various construction projects that deal with soil improvement to choose an appropriate method for preparing and curing a soil–binder mixture to simulate the field conditions as much as possible and obtain uniform soil–binder mixtures.

Place, publisher, year, edition, pages
UK: ICE Publishing is a division of Thomas Telford Ltd, 2020
Keywords
soil specimens, Binder, stabilised soil, laboratory procedures
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77348 (URN)10.1680/jgere.19.00035 (DOI)
Available from: 2020-01-10 Created: 2020-01-10 Last updated: 2020-01-24
Zeinali, A., Edeskär, T. & Laue, J. (2020). Mechanism of thawing. Cogent Engineering, 7(1), Article ID 1716438.
Open this publication in new window or tab >>Mechanism of thawing
2020 (English)In: Cogent Engineering, E-ISSN 2331-1916, Vol. 7, no 1, article id 1716438Article in journal (Refereed) Published
Abstract [en]

Freezing–thawing phenomena have been studied at laboratory scale for decades with various techniques and test setups. In this study, a freezing–thawing laboratory apparatus was supplemented with a camera in order to get a better understanding of ice formation during the freezing period and ice melting during the thawing period. The results from three thawing tests with identical samples but different boundary conditions are presented here. Water intends to migrate upward even when the entire frozen part has been thawed. That would cause excess pore water pressure and softening of the soil after the thawing period as well. Upward water migration after the thawing period is due to changes in thawed soil properties such as permeability and fine particle redistribution. The rate at which thawing takes place is a very important factor for thawing conditions. Moreover, freezing condition, i.e. access to water, has a high impact on thawing soil. If the volume of ice lenses is sufficient, frozen soil would fluidize during thawing.

Place, publisher, year, edition, pages
Taylor & Francis, 2020
Keywords
freezing, thawing, image analysis, frost actions, laboratory freezing-thawing tests, thaw settlement
National Category
Geotechnical Engineering
Research subject
Soil Mechanics; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77774 (URN)10.1080/23311916.2020.1716438 (DOI)000510001400001 ()
Note

Validerad;2020;Nivå 2;2020-02-19 (johcin)

Available from: 2020-02-19 Created: 2020-02-19 Last updated: 2020-02-19Bibliographically approved
Al Amli, A. S., Al-Ansari, N. & Laue, J. (2020). Numerical simulation of behaviour of reinforced concrete bars in saturated soil using theoretical models. Journal of Engineering Science and Technology, 15(1), 392-405
Open this publication in new window or tab >>Numerical simulation of behaviour of reinforced concrete bars in saturated soil using theoretical models
2020 (English)In: Journal of Engineering Science and Technology, ISSN 1823-4690, Vol. 15, no 1, p. 392-405Article in journal (Refereed) Published
Abstract [en]

This study presents a nonlinear analysis for square reinforced concrete (RC) foundation slab with bars used with both unsaturated and saturated soils in order to investigate, which response is affected by loading. Different parametric studies are undertaken in this study to determine the effect of load-displacement relationships for RC member or foundation with different cases such as (the distance of bars, diameters of bars reinforcement, types of reinforcement bars steel bars and geogrid reinforcement, yield stress for reinforcement and modulus of elasticity with compressive strength for concrete). A finite element model by ABAQUS software program is used to predict the load versus vertical displacement response of the tested RC foundations with soil by using other researchers´ experimental results. The present finite element models account for the constituent load-displacement behaviour between the RC foundations with soil and the effective load. The numerical results were compared with the experimental results obtained from other research, and good correlations were obtained. The models developed in this study can accurately capture the behaviour and predict the load-displacement of RC foundation with soil. This study shows that geogrid reinforcement enhanced the capacity of the foundation or member when used with different ratios of steel bars in soil and this provides a sustainable solution by reducing steel reinforcement. This geogrid ratio the reinforcement, while the member in saturated soil

is less strong than it when in unsaturated soil.

Place, publisher, year, edition, pages
Malaysia: School of Engineering. Taylor’s University, 2020
Keywords
Bar, Concrete, Geogrid, Models, Numerical, Reinforced, Soil
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77698 (URN)
Note

Validerad;2020;Nivå 2;2020-02-17 (johcin)

Available from: 2020-02-14 Created: 2020-02-14 Last updated: 2020-02-17Bibliographically approved
Sissakian, V., Al-Ansari, N., Adamo, N. & Laue, J. (2020). Origins and Utilizations of the Main Natural Depressions in Iraq. Journal of Earth Sciences and Geotechnical Engineering, 10(1), 15-41
Open this publication in new window or tab >>Origins and Utilizations of the Main Natural Depressions in Iraq
2020 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 10, no 1, p. 15-41Article in journal (Refereed) Published
Abstract [en]

Many natural depressions occur in Iraq with different origins, sizes, shapes and utilization. In this study, nine main depressions are studied and discussed, especially their origins, they are: Tharthar, Hab’baniyah, Raz’zazah, Ga’ara, Umm Chaimin, Salman, Slaibat Dukan, and Derbendikhan. The study was achieved by using satellite images of high accuracy, geological maps and reports, historical and irrigation data. All the mentioned depressions apart from Salman and Ga’ara depression are used for irrigation uses, especially for flood control others are used for electric power generation; or has no any use. The study revealed that some of the depressions are formed due to karstification, others due to tectonic activity and some due to combination of karstification and tectonic activity. However, the role of fluvial and wind erosion cannot be ignored in the development of the depressions. 

Place, publisher, year, edition, pages
Scientific Press International Limited, 2020
Keywords
Tharthar, Hab’baniyah, Raz’zazah, Ga’ara, Umm Chaimin, Salman, Slaibat, Dukan, Derbendikhan
National Category
Geotechnical Engineering
Research subject
Soil Mechanics; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77255 (URN)
Note

Validerad;2020;Nivå 1;2020-01-09 (johcin)

Available from: 2019-12-27 Created: 2019-12-27 Last updated: 2020-01-09Bibliographically approved
Al-Madhlom, Q., Nordell, B., Chabuk, A., Al-Ansari, N., Lindblom, J., Laue, J. & Hussain, H. M. (2020). Potential use of UTES in Babylon Governorate, Iraq. Groundwater for Sustainable Development, 10, Article ID 100283.
Open this publication in new window or tab >>Potential use of UTES in Babylon Governorate, Iraq
Show others...
2020 (English)In: Groundwater for Sustainable Development, ISSN 2352-801X, Vol. 10, article id 100283Article in journal (Refereed) Published
Abstract [en]

There is a global attention that the future energy systems will be based on renewable energy like solar and wind. The large-scale utilization of renewables in space heating and cooling requires large Thermal Energy Storage TES to overcome the varying supply and demand. The process of producing the best Underground Thermal Energy Storage UTES system pass through two steps: first, finding the best type of UTES system, second, finding the best locations to install UTES system. Both of these two steps depend extremely on the site specific parameters such that the depth to the groundwater, transmissivity, type of soil, the depth to the bedrock, and seepage velocity. The purpose of this paper is to explain some of the site specific parameters that the type of UTES-system depends on and explain the suitable type of UTES systems. This study considers Babylon province (Iraq) as study area. This province has electricity deficiency due to Heating Ventilating and Air Conditioning HVAC applications. The methodology of this study includes reviewing the literature that consider the study area, and using Arc Map/GIS to visualize some of the in-site parameters. The results indicate that the best type of UTES system for the considered region is either aquifer or pit type, due to the type of the soil and the depth to the crystalline bedrock. The hydraulic conductivity and the seepage velocity in the considered region are (0.0023–2.5) m/d and (1.3 × 10−6 – 3.45 × 10−3) m/d respectively. These conditions satisfy the standards which regard aquifer type.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Renewable energy, Groundwater, Aquifer thermal energy storage, Pit thermal energy storage
National Category
Geotechnical Engineering Water Engineering
Research subject
Soil Mechanics; Soil Mechanics; Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-76206 (URN)10.1016/j.gsd.2019.100283 (DOI)2-s2.0-85073592615 (Scopus ID)
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-12-17
Abdullah, M., Al-Ansari, N. & Laue, J. (2020). Water Harvesting in Iraq: Status and Opportunities. Journal of Earth Sciences and Geotechnical Engineering, 10(1), 199-217
Open this publication in new window or tab >>Water Harvesting in Iraq: Status and Opportunities
2020 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 10, no 1, p. 199-217Article in journal (Refereed) Published
Abstract [en]

Water harvesting in Iraq is an old application with limited extent. Western Desert, Jazeera Desert and Eastern Valleys, are the zones were the water harvesting must be employed. Several water harvesting dams in Western Desert had built since 1970s, these dams are intended to provide habitat and recharge of groundwater resources. There is limited opportunity to recharge groundwater in Jazeera area due to existence of gypsum layers. Regarding Eastern Valleys, the experience of building water harvesting dams on the valleys manifested that sediments accumulation is the main obstacle to adapt this solution. Hemrin Hills considered as one of the most intensively eroded areas in Iraq, so, soil conservation and water harvesting development is important. Many small dams were built in mountainous zone in the last two decades, some are important for agriculture expansion, but there is need to evaluate the effects on large dams feeding. North-Eastern parts of Jordan, which has similar natural conditions of Northern Desert, had present a successful example of water harvesting development.  

Place, publisher, year, edition, pages
UK: Scientific Press International Limited, 2020
Keywords
Water Harvesting, Small Dams, Western Desert, Jazeera Desert, Eastern Valleys
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77380 (URN)
Note

Validerad;2020;Nivå 1;2020-01-24 (johcin)

Available from: 2020-01-14 Created: 2020-01-14 Last updated: 2020-01-24Bibliographically approved
Al-Jabban, W., Laue, J., Knutsson, S. & Al-Ansari, N. (2019). A Comparative Evaluation of Cement and By-Product Petrit T in Soil Stabilization. Applied Sciences, 9(23), Article ID 5238.
Open this publication in new window or tab >>A Comparative Evaluation of Cement and By-Product Petrit T in Soil Stabilization
2019 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 9, no 23, article id 5238Article in journal (Refereed) Published
Abstract [en]

This study presents a comparison between the effectiveness of adding low binder amounts of industrial by-product Petrit T as well as cement to modify and improve fine-grained soil. Binder amount was added by soil dry weight; cement at 1%, 2%, 4% and 7% and Petrit T at 2%, 4% and 7%. The unconfined compressive strength (UCS) was used as an indicator of soil strength. In addition, the consistency limits, laser particle size analysis, and pH tests were also conducted on the treated soil. The samples were cured at 20 °C for different periods from 7 to 90 days before testing. Results indicate that cement is more effective at improving the physical and engineering properties of the treated soil. Soil plasticity index decreases after treatment and with time. Liquidity index and the water content to plastic limit ratio are introduced as new indices to define the improvement in the workability of treated soil. Soil particle size distribution is changed by reducing the clay size fraction and increasing the silt size fraction after treatment. The findings confirm that adding small binder contents improve soil properties, which subsequently reduce the environmental threats and costs that are associated with using a high amount of binder.

Place, publisher, year, edition, pages
Switzerland: MDPI, 2019
Keywords
Petrit T, cement, secant modulus, workability, soil strength, solidification, pH
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-77023 (URN)10.3390/app9235238 (DOI)
Note

Validerad;2019;Nivå 2;2019-12-09 (johcin)

Available from: 2019-12-02 Created: 2019-12-02 Last updated: 2019-12-09Bibliographically approved
Alzeyadi, A., Al-Ansari, N., Al-Rawabdeh, A. M. & Laue, J. (2019). A Novel Coating Method for Create Filter Media Capable to Remove Phosphate from Wastewater Effectively. Engineering, 11(8), 443-463
Open this publication in new window or tab >>A Novel Coating Method for Create Filter Media Capable to Remove Phosphate from Wastewater Effectively
2019 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 11, no 8, p. 443-463Article in journal (Refereed) Published
Abstract [en]

Filtration materials coating with metallic oxides represented a good method for phosphate sorption. However, most of the researchers utilize chemicals as a source of metallic oxides and heating process to set the chemicals over the filtration materials. This study is aimed to introduce the furnace bottom ash FBA as a source of metallic oxides; it is available free because it is dumped as a waste material from power generation plants. The method of creating new filter media involves coating the limestone and sand by FBA, and the ordinary Portland cement OPC utilized as binder to binding the mixture materials. The water is the factor which is responsible for activating the OPC. All factors such as mixed materials ratio, water content and age of reaction have subjected to optimization process. The results revealed that the optimal mixture for phosphate removal consists of 40% FBA, 5% OPC from dry weight of supporting material, 35% water ratio from the total weight of FBA and OPC, and 14 days are enough to complete the materials reaction. Limestone-furnace bottom ash LFBA indicated high capacity for phosphate sorption and possibility  of  efficiency  regenerate.  This  study  demonstrates  a  new  method  for coating the filtration materials more convenient with sustainability approach.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2019
Keywords
Calcium-Silicate Hydrates, FBA, Metal Oxides, Sorption, Upflow Filter, Wastewater Treatment
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-75647 (URN)10.4236/eng.2019.118032 (DOI)
Note

Validerad;2020;Nivå 1;2019-12-19 (johcin)

Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-12-19Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-1935-1743

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