TY  - JOUR
AU  - Đoković, Ksenija
AU  - Hadži-Niković, Gordana
AU  - Šušić, Nenad
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/401
AB  - Due to rapid development of modern highways and railroad in Serbia, the need for embankment materials has increased. Deposits of natural materials used for this purpose often contain dispersive soils. On the other hand, thermal power plants in Serbia annually generate several million tons of fly ash, which could be used to reduce the dispersion of material embedded in embankments. The paper presents the results of tests conducted for the first time in Serbia to assess the improvement in natural soil dispersivity with fly ash from a thermal power plant. The dispersivity of mixtures of fly ash and natural soil was tested according to ASTM and BS standards. To determine the optimal ash content, 10, 30 or 50% of fly ash was added to the soil samples. The results show that 30-50% of fly ash reduces the dispersivity of natural soil for one to two dispersion classes.
PB  - Publ House Bulgarian Acad Sci, Sofia
T2  - Comptes Rendus de l Academie Bulgare des Sciences
T1  - Application of fly ash to reduce soil dispersivity in embankments
EP  - 898
IS  - 6
SP  - 890
VL  - 74
DO  - 10.7546/CRABS.2021.06.11
ER  - 

@article{
author = "Đoković, Ksenija and Hadži-Niković, Gordana and Šušić, Nenad",
year = "2021",
abstract = "Due to rapid development of modern highways and railroad in Serbia, the need for embankment materials has increased. Deposits of natural materials used for this purpose often contain dispersive soils. On the other hand, thermal power plants in Serbia annually generate several million tons of fly ash, which could be used to reduce the dispersion of material embedded in embankments. The paper presents the results of tests conducted for the first time in Serbia to assess the improvement in natural soil dispersivity with fly ash from a thermal power plant. The dispersivity of mixtures of fly ash and natural soil was tested according to ASTM and BS standards. To determine the optimal ash content, 10, 30 or 50% of fly ash was added to the soil samples. The results show that 30-50% of fly ash reduces the dispersivity of natural soil for one to two dispersion classes.",
publisher = "Publ House Bulgarian Acad Sci, Sofia",
journal = "Comptes Rendus de l Academie Bulgare des Sciences",
title = "Application of fly ash to reduce soil dispersivity in embankments",
pages = "898-890",
number = "6",
volume = "74",
doi = "10.7546/CRABS.2021.06.11"
}

Đoković, K., Hadži-Niković, G.,& Šušić, N.. (2021). Application of fly ash to reduce soil dispersivity in embankments. in Comptes Rendus de l Academie Bulgare des Sciences
Publ House Bulgarian Acad Sci, Sofia., 74(6), 890-898.
https://doi.org/10.7546/CRABS.2021.06.11

Đoković K, Hadži-Niković G, Šušić N. Application of fly ash to reduce soil dispersivity in embankments. in Comptes Rendus de l Academie Bulgare des Sciences. 2021;74(6):890-898.
doi:10.7546/CRABS.2021.06.11 .

Đoković, Ksenija, Hadži-Niković, Gordana, Šušić, Nenad, "Application of fly ash to reduce soil dispersivity in embankments" in Comptes Rendus de l Academie Bulgare des Sciences, 74, no. 6 (2021):890-898,
https://doi.org/10.7546/CRABS.2021.06.11 . .

TY  - JOUR
AU  - Hadži-Niković, Gordana
AU  - Đoković, Ksenija
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/367
AB  - The paper presents the results of recent investigations of the Zemun Loess Plateau, which focused on unsaturated and dispersive loess soil. Soil water retention curves, SWRCs, were determined experimentally, using a pressure plate apparatus for suction values of up to 1500 kPa, according to ASTM(1). Soil dispersivity was determined by means of the double hydrometer test, crumb test and pinhole test according to BS2 and ASTM1. The tests were carried out on samples of loess soil with different grain-size distributions, as well as natural and artificially prepared samples with different degree of compaction. The results of the study confirm that an indirect correlation can be established between SWRC parameters and soil dispersivity. Soil dispersivity increased with increasing soil entry values (u(a) - u(w))(b) and the residual degree of saturation S-res, and decreased with decreasing coefficient lambda. The air entry value and residual degree of saturation increased and the desaturation rate decreased with increasing proportions of the clay-size fraction. Soil compaction appears to have a greater effect on SWRC parameters than on soil dispersivity. The air entry value increased, but coefficient lambda. decreased with increasing density. Loess soil dispersivity tends to depend more on the chemical and mineral composition. Soils with more sodium and clay minerals are more dispersive.
PB  - Publ House Bulgarian Acad Sci, Sofia
T2  - Comptes Rendus de l Academie Bulgare des Sciences
T1  - Water retention parameters and sediment dispersivity of the Zemun loess plateau (Belgrade, Serbia)
EP  - 946
IS  - 7
SP  - 937
VL  - 72
DO  - 10.7546/CRABS.2019.07.11
ER  - 

@article{
author = "Hadži-Niković, Gordana and Đoković, Ksenija",
year = "2019",
abstract = "The paper presents the results of recent investigations of the Zemun Loess Plateau, which focused on unsaturated and dispersive loess soil. Soil water retention curves, SWRCs, were determined experimentally, using a pressure plate apparatus for suction values of up to 1500 kPa, according to ASTM(1). Soil dispersivity was determined by means of the double hydrometer test, crumb test and pinhole test according to BS2 and ASTM1. The tests were carried out on samples of loess soil with different grain-size distributions, as well as natural and artificially prepared samples with different degree of compaction. The results of the study confirm that an indirect correlation can be established between SWRC parameters and soil dispersivity. Soil dispersivity increased with increasing soil entry values (u(a) - u(w))(b) and the residual degree of saturation S-res, and decreased with decreasing coefficient lambda. The air entry value and residual degree of saturation increased and the desaturation rate decreased with increasing proportions of the clay-size fraction. Soil compaction appears to have a greater effect on SWRC parameters than on soil dispersivity. The air entry value increased, but coefficient lambda. decreased with increasing density. Loess soil dispersivity tends to depend more on the chemical and mineral composition. Soils with more sodium and clay minerals are more dispersive.",
publisher = "Publ House Bulgarian Acad Sci, Sofia",
journal = "Comptes Rendus de l Academie Bulgare des Sciences",
title = "Water retention parameters and sediment dispersivity of the Zemun loess plateau (Belgrade, Serbia)",
pages = "946-937",
number = "7",
volume = "72",
doi = "10.7546/CRABS.2019.07.11"
}

Hadži-Niković, G.,& Đoković, K.. (2019). Water retention parameters and sediment dispersivity of the Zemun loess plateau (Belgrade, Serbia). in Comptes Rendus de l Academie Bulgare des Sciences
Publ House Bulgarian Acad Sci, Sofia., 72(7), 937-946.
https://doi.org/10.7546/CRABS.2019.07.11

Hadži-Niković G, Đoković K. Water retention parameters and sediment dispersivity of the Zemun loess plateau (Belgrade, Serbia). in Comptes Rendus de l Academie Bulgare des Sciences. 2019;72(7):937-946.
doi:10.7546/CRABS.2019.07.11 .

Hadži-Niković, Gordana, Đoković, Ksenija, "Water retention parameters and sediment dispersivity of the Zemun loess plateau (Belgrade, Serbia)" in Comptes Rendus de l Academie Bulgare des Sciences, 72, no. 7 (2019):937-946,
https://doi.org/10.7546/CRABS.2019.07.11 . .

TY  - CONF
AU  - Hadži-Niković, Gordana
AU  - Rakić, Dragoslav
AU  - Đoković, Ksenija
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/264
AB  - Stability analyses were performed for a real engineering-geological cross-section of unsaturated Quaternary silt sediments. Unsaturated shear strength is a function of the two stress variables: net normal stress and matric suction. Constitutive equations (unsaturated shear strength - matric suction) and (angle ∝b - matric suction) were defined for these silty soils. These equations were established on the basis of primary constitutive relationships for unsaturated soils by soil-water characteristic curves (effective degree of saturation - matric suction). Soil-water characteristic curves were obtained from results of experimental tests on draining saturated soil samples under different pressures, performed for the first time in Serbia, in a 15 bar pressure plate extractor, according ASTM. Effective shear strength parameters c' and ∝' were also experimentally obtained from direct shear tests. Stability analyses were performed using the GLE method for different climate conditions, before and after rainfall, i.e. for different values of matric suction. Stability analyses were performed for the same groundwater level, too. It was confirmed that rainfall decreases the angle (pb and stability of natural unsaturated soil slopes. Decreasing the ∝b angle of unsaturated soil, due to rainfall, decreases the safety factor of the slope faster for coarse-grained soil than for finegrained soil.
PB  - ICE Publishing
C3  - Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Confer
T1  - Effect of changes in matric suction on slope stability in natural unsaturated soil
EP  - 1566
SP  - 1561
VL  - 4
UR  - https://hdl.handle.net/21.15107/rcub_rims_264
ER  - 

@conference{
author = "Hadži-Niković, Gordana and Rakić, Dragoslav and Đoković, Ksenija",
year = "2015",
abstract = "Stability analyses were performed for a real engineering-geological cross-section of unsaturated Quaternary silt sediments. Unsaturated shear strength is a function of the two stress variables: net normal stress and matric suction. Constitutive equations (unsaturated shear strength - matric suction) and (angle ∝b - matric suction) were defined for these silty soils. These equations were established on the basis of primary constitutive relationships for unsaturated soils by soil-water characteristic curves (effective degree of saturation - matric suction). Soil-water characteristic curves were obtained from results of experimental tests on draining saturated soil samples under different pressures, performed for the first time in Serbia, in a 15 bar pressure plate extractor, according ASTM. Effective shear strength parameters c' and ∝' were also experimentally obtained from direct shear tests. Stability analyses were performed using the GLE method for different climate conditions, before and after rainfall, i.e. for different values of matric suction. Stability analyses were performed for the same groundwater level, too. It was confirmed that rainfall decreases the angle (pb and stability of natural unsaturated soil slopes. Decreasing the ∝b angle of unsaturated soil, due to rainfall, decreases the safety factor of the slope faster for coarse-grained soil than for finegrained soil.",
publisher = "ICE Publishing",
journal = "Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Confer",
title = "Effect of changes in matric suction on slope stability in natural unsaturated soil",
pages = "1566-1561",
volume = "4",
url = "https://hdl.handle.net/21.15107/rcub_rims_264"
}

Hadži-Niković, G., Rakić, D.,& Đoković, K.. (2015). Effect of changes in matric suction on slope stability in natural unsaturated soil. in Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Confer
ICE Publishing., 4, 1561-1566.
https://hdl.handle.net/21.15107/rcub_rims_264

Hadži-Niković G, Rakić D, Đoković K. Effect of changes in matric suction on slope stability in natural unsaturated soil. in Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Confer. 2015;4:1561-1566.
https://hdl.handle.net/21.15107/rcub_rims_264 .

Hadži-Niković, Gordana, Rakić, Dragoslav, Đoković, Ksenija, "Effect of changes in matric suction on slope stability in natural unsaturated soil" in Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Confer, 4 (2015):1561-1566,
https://hdl.handle.net/21.15107/rcub_rims_264 .

TY  - JOUR
AU  - Hadži-Niković, Gordana
AU  - Đoković, Ksenija
AU  - Vujić, S.
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/265
AB  - Retaining walls are often built in unsaturated soil at shallow depth above groundwater level. It is critical to define active pressure in unsaturated soil for designing retaining walls, based on the expanded theory of lateral pressure by Rankin, considering interaction between active pressure and absorption of soil. For unsaturated floury soil occurring above groundwater level for a long time, the angle of internal friction is estimated based on the soil-water curve, for various depths of retaining walls and different values of absorption, which is constant and decreases with depth, the active pressures and critical height are determined for foundation pits with vertical unsupported walls. The results confirm that absorption reduces active pressure on a retaining wall and the critical height of the vertical walls of the foundation pits can be increased when absorption grows.
PB  - Pleiades Publishing Inc, Moscow
T2  - Journal of Mining Science
T1  - Effect of absorption on active pressure in floury soil
EP  - 260
IS  - 2
SP  - 253
VL  - 51
DO  - 10.1134/S1062739115020064
ER  - 

@article{
author = "Hadži-Niković, Gordana and Đoković, Ksenija and Vujić, S.",
year = "2015",
abstract = "Retaining walls are often built in unsaturated soil at shallow depth above groundwater level. It is critical to define active pressure in unsaturated soil for designing retaining walls, based on the expanded theory of lateral pressure by Rankin, considering interaction between active pressure and absorption of soil. For unsaturated floury soil occurring above groundwater level for a long time, the angle of internal friction is estimated based on the soil-water curve, for various depths of retaining walls and different values of absorption, which is constant and decreases with depth, the active pressures and critical height are determined for foundation pits with vertical unsupported walls. The results confirm that absorption reduces active pressure on a retaining wall and the critical height of the vertical walls of the foundation pits can be increased when absorption grows.",
publisher = "Pleiades Publishing Inc, Moscow",
journal = "Journal of Mining Science",
title = "Effect of absorption on active pressure in floury soil",
pages = "260-253",
number = "2",
volume = "51",
doi = "10.1134/S1062739115020064"
}

Hadži-Niković, G., Đoković, K.,& Vujić, S.. (2015). Effect of absorption on active pressure in floury soil. in Journal of Mining Science
Pleiades Publishing Inc, Moscow., 51(2), 253-260.
https://doi.org/10.1134/S1062739115020064

Hadži-Niković G, Đoković K, Vujić S. Effect of absorption on active pressure in floury soil. in Journal of Mining Science. 2015;51(2):253-260.
doi:10.1134/S1062739115020064 .

Hadži-Niković, Gordana, Đoković, Ksenija, Vujić, S., "Effect of absorption on active pressure in floury soil" in Journal of Mining Science, 51, no. 2 (2015):253-260,
https://doi.org/10.1134/S1062739115020064 . .