TY  - CONF
AU  - Berisavljević, Zoran
AU  - Milenković, Svetozar
AU  - Berisavljević, Dusan
AU  - Šušić, Nenad
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/284
AB  - The tunnel Progon is being constructed as a part of Corridor 10 highway project about 5 km north from the border crossing with Bulgaria in southern Serbia. During the design process 2D finite element analysis was utilized with the objective to investigate an influence of different support systems on the convergence across an excavation. Two models were used in calculations. The first model is elastic perfectly-plastic with constant stiffness independent of the stress level. The second model assumes hyperbolic relationship between the deviatoric stress and axial strain and stress dependent stiffness. This model also accounts for small strain stiffness of soil. In order to allow for a certain convergence across an excavation the load reduction method was utilized. Convergence monitoring is currently ongoing for the excavated portion of approx. 700 m of the tunnel exit portal. The measurements show cumulative displacements in the range of 1-3 cm. Results obtained by the analyses prior to the tunnel construction are in good agreement with the measurements. Convergence is approx. 5 cm when MC model is used and around 1 cm in the case of HS-small model, thus limiting the measurement results from the lower and upper bound.
PB  - Springer Int Publishing Ag, Cham
C3  - Engineering Geology for Society and Territory, Vol 6: Applied Geology for Major Engineering Projects
T1  - Convergence Predictions and Primary Support Optimization of the Tunnel Progon
EP  - 328
SP  - 323
DO  - 10.1007/978-3-319-09060-3_55
ER  - 

@conference{
author = "Berisavljević, Zoran and Milenković, Svetozar and Berisavljević, Dusan and Šušić, Nenad",
year = "2015",
abstract = "The tunnel Progon is being constructed as a part of Corridor 10 highway project about 5 km north from the border crossing with Bulgaria in southern Serbia. During the design process 2D finite element analysis was utilized with the objective to investigate an influence of different support systems on the convergence across an excavation. Two models were used in calculations. The first model is elastic perfectly-plastic with constant stiffness independent of the stress level. The second model assumes hyperbolic relationship between the deviatoric stress and axial strain and stress dependent stiffness. This model also accounts for small strain stiffness of soil. In order to allow for a certain convergence across an excavation the load reduction method was utilized. Convergence monitoring is currently ongoing for the excavated portion of approx. 700 m of the tunnel exit portal. The measurements show cumulative displacements in the range of 1-3 cm. Results obtained by the analyses prior to the tunnel construction are in good agreement with the measurements. Convergence is approx. 5 cm when MC model is used and around 1 cm in the case of HS-small model, thus limiting the measurement results from the lower and upper bound.",
publisher = "Springer Int Publishing Ag, Cham",
journal = "Engineering Geology for Society and Territory, Vol 6: Applied Geology for Major Engineering Projects",
title = "Convergence Predictions and Primary Support Optimization of the Tunnel Progon",
pages = "328-323",
doi = "10.1007/978-3-319-09060-3_55"
}

Berisavljević, Z., Milenković, S., Berisavljević, D.,& Šušić, N.. (2015). Convergence Predictions and Primary Support Optimization of the Tunnel Progon. in Engineering Geology for Society and Territory, Vol 6: Applied Geology for Major Engineering Projects
Springer Int Publishing Ag, Cham., 323-328.
https://doi.org/10.1007/978-3-319-09060-3_55

Berisavljević Z, Milenković S, Berisavljević D, Šušić N. Convergence Predictions and Primary Support Optimization of the Tunnel Progon. in Engineering Geology for Society and Territory, Vol 6: Applied Geology for Major Engineering Projects. 2015;:323-328.
doi:10.1007/978-3-319-09060-3_55 .

Berisavljević, Zoran, Milenković, Svetozar, Berisavljević, Dusan, Šušić, Nenad, "Convergence Predictions and Primary Support Optimization of the Tunnel Progon" in Engineering Geology for Society and Territory, Vol 6: Applied Geology for Major Engineering Projects (2015):323-328,
https://doi.org/10.1007/978-3-319-09060-3_55 . .

TY  - JOUR
AU  - Berisavljević, Dusan
AU  - Berisavljević, Zoran
AU  - Cebasek, Vladimir
AU  - Šušić, Nenad
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/254
AB  - Structural collapse and sudden volume changes represent a major geotechnical issue, particularly in loess soils. There are different criteria for assessing collapse potential based on laboratory test results, which require the collection of undisturbed samples from test pits. This can be a complicated and costly procedure, often financially unjustified for smaller projects. This paper presents the results of seismic dilatometer tests (SDMT) performed at a single location in a loess soil in Belgrade, in addition to the results of single oedometer collapse tests performed on high quality samples from test pits. After comparing laboratory test results it was possible to determine that in samples collected from boreholes, dry unit weight is approximately 20% higher than in block samples taken from test pits, while moisture content is between 1 and 4% higher. Unit weight estimated from DMT is on average 15% higher than the unit weight obtained from block samples. The constrained modulus (M-DMT) determined by DMT are highly compatible with oedometer modulus (E-oed) obtained from samples at natural moisture content. This paper presents two possible ways of identifying collapsing loess based on intermediate DMT parameters and the ratio of G(0)/M-DMT. The tests results indicate that if the ratio between the material index (I-D) and the horizontal stress index (K-D) is greater than 5, the danger of collapse is imminent. Simultaneous observation of the changes of I-D and K-D with depth on a semi-log graph in the same scale is recommended. In this way the relative distance between them may be clearly noticed; the larger the distance becomes, the greater the risk of collapse. In the collapsing loess ratio G(0)/M-DMT is found to be higher than 21 for K-D less than 0.6, while in non-collapsing loess G(0)/M-DMT is less than 21 for higher values of K-D. In terms of DMT, loess is considered as underconsolidated soil, which is one of the most common "definitions" of loess.
PB  - Elsevier, Amsterdam
T2  - Engineering Geology
T1  - Characterisation of collapsing loess by seismic dilatometer
EP  - 189
SP  - 180
VL  - 181
DO  - 10.1016/j.enggeo.2014.07.011
ER  - 

@article{
author = "Berisavljević, Dusan and Berisavljević, Zoran and Cebasek, Vladimir and Šušić, Nenad",
year = "2014",
abstract = "Structural collapse and sudden volume changes represent a major geotechnical issue, particularly in loess soils. There are different criteria for assessing collapse potential based on laboratory test results, which require the collection of undisturbed samples from test pits. This can be a complicated and costly procedure, often financially unjustified for smaller projects. This paper presents the results of seismic dilatometer tests (SDMT) performed at a single location in a loess soil in Belgrade, in addition to the results of single oedometer collapse tests performed on high quality samples from test pits. After comparing laboratory test results it was possible to determine that in samples collected from boreholes, dry unit weight is approximately 20% higher than in block samples taken from test pits, while moisture content is between 1 and 4% higher. Unit weight estimated from DMT is on average 15% higher than the unit weight obtained from block samples. The constrained modulus (M-DMT) determined by DMT are highly compatible with oedometer modulus (E-oed) obtained from samples at natural moisture content. This paper presents two possible ways of identifying collapsing loess based on intermediate DMT parameters and the ratio of G(0)/M-DMT. The tests results indicate that if the ratio between the material index (I-D) and the horizontal stress index (K-D) is greater than 5, the danger of collapse is imminent. Simultaneous observation of the changes of I-D and K-D with depth on a semi-log graph in the same scale is recommended. In this way the relative distance between them may be clearly noticed; the larger the distance becomes, the greater the risk of collapse. In the collapsing loess ratio G(0)/M-DMT is found to be higher than 21 for K-D less than 0.6, while in non-collapsing loess G(0)/M-DMT is less than 21 for higher values of K-D. In terms of DMT, loess is considered as underconsolidated soil, which is one of the most common "definitions" of loess.",
publisher = "Elsevier, Amsterdam",
journal = "Engineering Geology",
title = "Characterisation of collapsing loess by seismic dilatometer",
pages = "189-180",
volume = "181",
doi = "10.1016/j.enggeo.2014.07.011"
}

Berisavljević, D., Berisavljević, Z., Cebasek, V.,& Šušić, N.. (2014). Characterisation of collapsing loess by seismic dilatometer. in Engineering Geology
Elsevier, Amsterdam., 181, 180-189.
https://doi.org/10.1016/j.enggeo.2014.07.011

Berisavljević D, Berisavljević Z, Cebasek V, Šušić N. Characterisation of collapsing loess by seismic dilatometer. in Engineering Geology. 2014;181:180-189.
doi:10.1016/j.enggeo.2014.07.011 .

Berisavljević, Dusan, Berisavljević, Zoran, Cebasek, Vladimir, Šušić, Nenad, "Characterisation of collapsing loess by seismic dilatometer" in Engineering Geology, 181 (2014):180-189,
https://doi.org/10.1016/j.enggeo.2014.07.011 . .