- Type of paper
: Paper in journal
Title: Numerical Analysis of the Soil Consolidation - Part I:
Theoretical Background and Numerical Solution for the General Case of
Three-Dimensional Consolidation
- Authors:
- Kovačić, Davorin (6574)
- Szavits-Nossan, Antun (45750)
Journal: Međunarodni časopis za inženjersko modeliranje
Number: 1
ISSN: 0352-9495
Volume: 4
Year: 1991
Pages: from 1 to 6
Number of references: 14
Language: hrvatski
Summary: The paper deals with the procedure for numerical solution
of thesoil consolidation problem.
The theoretical background of the procedure is given within theframework of
Biot's theory of consolidation. Unlike the usualapproach, the displacement
of the soil skeleton and thedisplacement of the pore fluid relative to the
skeleton aredefined as the main field variables. Besides, a
generalstress-strain constitutive equation for soil skeleton is allovedfor.
Finite element formulation is given by means of Galerkin methodusing the
weak formulation. Time discretization includes explicitand implicit
schemes.
Keywords: consolidation, finite elements, constitutive equation, theory, algorithm
- Type of paper
: Paper in journal
Title: Numerical Analysis of the Soil Consolidation - Part II:
Algorithm and Examples for the Particular Case of 2-D Consolidation
- Authors:
- Kovačić, Davorin (6574)
- Szavits-Nossan, Antun (45750)
Journal: Međunarodni časopis za inženjersko modeliranje
Number: 1
ISSN: 0352-9495
Volume: 5
Year: 1992
Pages: from 19 to 27
Number of references: 15
Language: hrvatski
Summary: The paper deals with the verification of the numerical
procedurefor the solution of the consolidation problem. Time
integrationalgorithm and basic features of computer implementation
arepresented. Test examples cover one-dimensional andtwo-dimensional
consolidation. The soil behaviour is modeled aslinear elastic and linear
elastic perfectly plastic medium. Somesuggestions for further improvement
of the numerical procedureare given in the conclusion.
Keywords: consolidation, finite elements, elastoplastic behaviour, algorithm, foundation settlement
- Type of paper
: Paper in journal
Title: Compressibility Parameters of Semipervious Confining
Layers Over- and/or Underlain by an Aquifer
- Authors:
- Kovačić, Davorin (6574)
- Bačani, Andrea (111253)
Journal: Rudarsko-geološki-naftni zbornik
Volume: 4
Year: 1992
Pages: from 75 to 80
Number of references: 18
Language: hrvatski
Summary: The paper deals with the importance of a reliable
interpretationof oedometer curve in order to determine the values
ofcompressibility parameters of semipervious confining layers over-and/or
underlain by an aqifer. The illustration of the proceduredescribed is given
in an example based on real soil data.
Keywords: semipervious confining layers, compressibility parameters, groundwater resources
- Type of paper
: Paper in journal
Title: Materials for the final cover of sanitary landfills
- Authors:
- Kovačić, Davorin (6574)
Journal: Rudarsko-geološki-naftni zbornik
Volume: 6
Year: 1994
Pages: from 11 to 15
Language: hrvatski
Summary: The paper deals with the selection of materials for the
sealing layer in the final cover of sanitary landfills. The sealing layer
is the most critical component of the final cover. Its role is to minimize
percolation of water through the final cover. Materials used for the
construction of the sealing layer are either of mineral origin (compacted
clay) or geosynthetic (geomembrane). They are most often used in
combination creating composite liners. Recently alternative materials are
also used like paper mill sludge or discarded swelling clay.
- Type of paper
: Paper in proceedings
Title: An Evaluation of 20 Years Old Earth-Rock Fill Dam Behavior
- Authors:
- Karbasi, Mahmood Seid
- Szavits-Nossan, Antun (45750)
- Žarković, Vladimir
- Editors
- Kreuzer, H.
- Dungar, R.
- Taylor, R.
Proceedings title: Dam Safety Ewaluation, Vol.1
Language: engleski
Place: Sutton, Surrey, Velika Britanija
Year: 1993
Pages: from 139 to 150
Meeting: International Workshop on Dam Safety Evaluation
Held: from 04/26/93 to 04/28/93
Summary: Results are presented of an effort to reveal and
understandmechanisms that led to the behavior of the 20 years old and 47,5m
high earth-rockfill dam evidenced by long term crestsettlements, horizontal
displacements, cracking and tilting, aswell as foundation soil settlements.
In this respect acomprehensive and detailed analysis of recorded histories
ofembankment surface displacements and foundation settlements hasbeen
undertaken.
Stability of earth dams is usually evaluated by consideringpotential
failure modes taking into account appropriatemechanical behavior of
embankment and foundation materials, aswell as imposed loads. By this
example it is shown that stabilityof an old dam can also be evaluated by a
proper analysis of longterm observation data. The proposed procedure
anables stabilityanalyses with the same loading conditions as the ones
required bystandard procedures. Since this procedure requires
nosimplifications used in standard analyses, it is considered to bemore
reliable.
Keywords: eart/rockfill dam, long term deformations, damages, analysis, measurement
- Type of paper
: Paper in proceedings
Title: Stability Evaluation of a Large Earth Dam Through
Observational Data Analysis
- Authors:
- Szavits-Nossan, Antun (45750)
- Žarković, Vladimir
- Lipić, Zdravko
- Editors
- Dvornik, Josip (11083)
- Pičulin, Srečko (13482)
- Radić, Jure (77404)
- Srkoč, Miljenko (44352)
- Šavor, Zlatko (186315)
- Šimunić, Želimir (46905)
Proceedings title: Kompjutor u obnovi Hrvatske
Language: hrvatski
Place: Zagreb
Year: 1992
Pages: from 327 to 333
Meeting: PRG '92, Primjena računala u graditeljstvu
Held: from 05/17/92 to 05/18/92
Summary: Stability of earth dams is usually evaluated by
consideringpotential failure modes taking into account
appropriatemechanical behaviour of embankment and foundation materials
aswell as imposed loads. By an example of an old earth dam, whichundrwent
considerable damage due to exccesive settlements, it isshown that its
stability can also be evaluated by a properanlysis of long term observation
data. The proposed procedureenables stability analyses with the same
loading conditions asthe ones required by standard procedures. The analysis
of a largeamount of observation data was only possible through the use of
acomputer and a proper software with adequate graphicalcapabilities.
Keywords: earth dam, long term deformations, damages, analysis of measurements
- Type of paper
: Paper in proceedings
Title: Should the Church of St. John the Baptist Be Demolished
- Authors:
- Marić, Božica (145714)
- Kovačić, Davorin (6574)
- Editors
- Radić, Jure (77404)
Proceedings title: Graditelji u obnovi Hrvatske
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 265 to 270
Meeting: Drugi radni sabor Graditelji u obnovi Hrvatske
Held: from 10/13/93 to 10/15/93
Summary: The church of St. John the Baptist in Kloštar Ivanić is
anexample of late gothic architecture. It is the largest buildingof that
kind in continental Croatia. After a number ofdevastations and restorations
only plain outer walls exist today.Two counterforts are missing as well.
The paper describes a possible method of renewal of the shrine
bystrengthening the existing structural elements. This method
ofreconstruction is deemed superior in comparison to thealternative
approach which proposes demolition and rebuilding ofsome walls of the
shrine.
Keywords: rehabilitation, gothic, church
- Type of paper
: Paper in proceedings
Title: Geotechnical Characteristics of Zagreb Waste Disposal Site
and Possibilities of Its Reclamation
- Authors:
- Kovačić, Davorin (6574)
- Mayer, Darko (29980)
- Muhovec, Ivan (151325)
- Editors
- Sarsby, R. B.
Proceedings title: Waste Disposal by Landfill
Language: engleski
Place: Rotterdam, Nedarlend
Year: 1993
Pages: from 543 to 547
Meeting: GREEN 93 - Geotechnics Related to the Environment
Held: from 06/28/93 to 07/01/93
Summary: The paper deals with the problem of Zagreb waste disposal
siteJakuševec. For almost 30 years the uncontrolled open dump hasbeen used.
The composition and quality of solid wastes aredetermined. The measures for
the reclamation of the site areconsidered and the proposition for the
construction of thesanitary landfill is given. The role of the slurry
trench cut-offwall and the system of discharge wells is pointed out from
thegeotechnical point of view. The results of illustrative
numericalanalyses are presented.
Keywords: open dump, reclamation, sanitary landfill, waste, cut-off wall, geotechnics
- Type of paper
: Paper in proceedings
Title: The road embankment on the island of Pag - sixteen years
later
- Authors:
- Kvasnička, Predrag
- Tušar, Z.
- Editors
- Mavar, Ramon
Proceedings title: Saopćenja 1
Language: hrvatski
Place: Zagreb
Year: 1994
ISBN/ISSN: 953-6085-05-4
Pages: from 301 to 316
Meeting: Geotehnika prometnih građevina, Novigrad 1994
Held: from 10/05/94 to 10/08/94
Summary: This paper describes behaviour of an embankment crossing
the sea bay on the island of Pag. The construction of embankment had begun
in 1977 and was finished in 1978. As it is built on weak soil, nonwoven
fabrics was layed between the embankment and the soil in order to support
its stability. The fabrics used was a nonwoven, needlepunched
polypropylene. The embankment was instrumented with settlement plates and
piezometers. Periodic readings were taken to determine the behaviour of the
embankment and to prevent undesirable events. Unfortunatly, shortly after
the embankment was finished most of the instruments were destroyed, making
all photographs and used a level to monitor elevation changes. Portions of
the embankment above deepest weak layer settled more than one meter. In
spite of this and of heavier traffic during the recent war, no instability
phenomena were observed, which proved that the laying of fabric is an
efficient technique of passing over the difficult subsoil conditions.
Keywords: Road embankment, weak soil
- Type of paper
: Paper in proceedings
Title: Permeability measurements of prepared soil samples of clay
form Soblinec
- Authors:
- Kvasnička, Predrag
- Matešić, Leo
- Editors
- Mavar, Ramon
Proceedings title: Priopćenja 1
Language: hrvatski
Place: Zagreb
Year: 1995
Pages: from 139 to 145
Meeting: Geotehnički problemi u urbanim sredinama
Held: from 10/04/94 to 10/06/94
Summary: Permeability measurements of laboratory prepared clay
samples is presented. Permeability measurementsa were carried out in a
computer controlled triaxial testing system by using so called flow-pump
technique. The flow-pump technique allows for more precise flow and
therefore more precise permeability measurements than in conventional test.
Test results shows that almost all permeability values are less then 10e-7
cm/s, that complies with the criteria stated for clay layers of sanitary
lundfields. Suggested are some modifications in standard flow-pump
procedure.
Keywords: permeability, flow-pump, clay liner
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Kvasnička, Predrag
- Matešić, Leo
- Editors
- Milanović, Zlatko
Proceedings title: Gospodarenje otpadom - Zagreb 94
Language: hrvatski
Place: Zagreb
Year: 1994
ISBN/ISSN: 953-96297-0-5
Pages: from 306 to 313
Meeting: III simpozij Gospodarenje otpadom
Held: from 11/23/94 to 11/25/94
Summary: Permeability measurements were conducted on undisturbed cla
samples with the laboratory flow-pump test. The test is performed in a
computer controlled triaxial testing system. A triaxial cell is introduced
to confine the samples, and full saturation of samples is ensured by
appling a constant level of back pressure. Permeability is measured by
introducing water at known constant flow rates into the base of thw
specimen with a flow-pump, and by monitoring the head difference induced
across the length of the specimen with sensitive transducers. The flow-pump
technique allows for more precise flow and therefore more precise
permeability measurements than conventional "falling-head" test. The
experiment duration is much shorter and because of that the seepage induced
consolidation is negligible.
Keywords: permeability, flow-pump, clay liner
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Sorić, I.
- Kovačić, Davorin (6574)
Proceedings title: Proceedings
Language: engleski
Place: New Delhi, USA
Year: 1994
Pages: from 1815 to 1818
Meeting: XIII International Conference on Soil Mechanics and Foundation Engineering
Held: from 01/05/94 to 01/10/94
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Kovačić, Davorin (6574)
- Čorko, Damir
- Editors
- Sorić, Jurica
- Vranković, Nikola
Proceedings title: Zbornik radova
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 259 to 268
Meeting: 1. kongres Hrvatskog društva za mehaniku
Held: from 09/14/94 to 09/17/94
Summary: Within the framework of municipal solid waste management it
is necessary to construct sanitarylandfills. This task has by no means
interdisciplinary feature but with pronounced geotechnical role. The main
problems to be solved are, among the other problems, settlements and
stability of waste material in the landfill. In relation to these problems
the paper deals with the mechanical behaviour of municipal solid waste.
Classical soil mechanics approach is addopted but the differences between
the soil behaviour and waste behaviuor are emphasized. Using some published
data from the literature several experimental procedure for the
determination of shear strength parameters are presented. It is concluded
that there is every reason to introduce the term "waste mechanics".
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Kovačić, Davorin (6574)
- Kvasnička, Predrag
- Znidarčić, Dobroslav
- Editors
- Milanović, Zlatko
Proceedings title: Gospodarenje otpadom - Zagreb 94
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 296 to 305
Meeting: III simpozij Gospodarenje otpadom
Held: from 11/23/94 to 11/25/94
Summary: Sanitary landfill is considered as an earth structure. The
paper discusses the issue of impermeability of the clay barriers within the
criterion for the achievement of maximum density of cohesive soil. This
criterion which is usually applied in geotechnical assignments needs to be
modofied due to the requirement on the valeu of maximum allowedhydraulic
conductivity of a lay barrier. In relation to this requirement the paper
stresses the importance of an effective method for hydraulic conductivity
measurement in the laboratory as well as in the field. The issue of the
chemical interaction between leachate and clay is underlined in connection
to the possible deterioration of clay properties.
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Znidarčić, Dobroslav
- Kovačić, Davorin (6574)
- Kvasnička, Predrag
- Editors
- Milanović, Zlatko
Proceedings title: Gospodarenje otpadom - Zagreb 94
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 393 to 398
Meeting: III simpozij Gospodarenje otpadom
Held: from 11/23/94 to 11/25/94
Summary: Waste disposal does not belong entirely to any of the
traditional engineering disciplines. The reason is that, until recently,
waste disposal was not considered to be a major problem in the society and
cosequently it did not attract adequate attention.
Today when the quantity of waste has enormously increased and when the
society has become aware of the adverse impactof different waste materials,
new methods of waste disposal are being sought. These methods should
protect the environment for a long period of time. The problems which are
encountered in these activities are of interdisciplinary character and new
methods for their solution should be sought in several traditional
engineering fields.
The approach to the solution of waste disposal problems will remain the
same until new engineers are educated according to the needs of waste
management. The technology developed in geotechnical engineering has an
important role in the solution of environmental problems and it should be
considered in their solution. The paper offers a review of such problems
and the appropriate methods of solution from the field of geotechnical
engineering. Apart from the description of the existing methods which could
be applied directly, the paper points to the problems for which no readily
available solution exist. Therefore additional research is needed and new
methods should be developed for their solution.
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Kovačić, Davorin (6574)
- Szavits-Nossan, Antun (45750)
- Editors
- Mavar, Ramon
Proceedings title: Saopćenja 1
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 421 to 430
Meeting: Geotehnika prometnih građevina, Novigrad 1994
Held: from 10/05/94 to 10/08/94
Summary: The paper presents results of a stress-strain analysis in
the foundation soil beneath wharf No. 5 in Ploča harbour due to fill load
on the adjacent depot. Initial stresse on the foundation soil were
determined under drained conditions, while stresses due to fill load on the
depot were calculated assuming undrained conditions. Soil - wharf structure
interaction was taken into account. Soft foundation clays were modeled by
an elastoplastic constitutive equation. It was shown that the presented
analysis gives realistic displacements and stresses in the foundation soil
and the wharf structure.
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Jurak, V.
- Kovačić, Davorin (6574)
- Garašić, Mladen
Proceedings title: The interplay between Geotechnical Engineering and Engineering Geology
Language: engleski
Place: Copenhagen, Danska
Year: 1995
Pages: from 4.77 to 4.82
Meeting: XI European Conference on Soil Mechanics and Foundation Engineering
Held: from 05/28/95 to 06/01/95
Summary: Regional characteristics of Dubrovnik and Montenegro zones
of the Adriatic coast are the existence of block paleoslides and the
occurence of strong earthquakes. Rock blocks on the flysch slope are found
at present. Various buildings are constructed on some blocks. The aim of
the paper is to analyse recent state of block stability and the possibility
of reactivation of landslide due to earthquake. The clear differentiation
of the engineering geology elements of the slopes, which represent the area
of high contrast of physiacl and mechanical characteristics, follows the
hydrogeological division on permeable and impermeable rocks. The possible
sliding surfaces were once the mechanical active planes and at the same
time are border-lines between two geotechnical media - the rock block and
the quasiplastic base. The flysch complex is adopted as the seismic
footwall. The paper includes stability analysis under seismic conditions
with the parameters of the montenegro earthquake in 1979.
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Szavits-Nossan, Antun (45750)
- Kovačević, Meho-Saša
- Ivšić, Tomislav
- Editors
- Rupčić, Josip
- Sever, Zvonimir
- Vilović, Marin
Proceedings title: Proceedings
Language: engleski
Place: Zagreb
Year: 1995
Pages: from 249 to 260
Meeting: International Conference Peruča Dam Remediation
Held: from 09/20/95 to 09/23/95
Summary: The analysis of the mechanical interaction of water-tight
cantilever diaphragm and dam body included the nonlinear stress-strain
analyses of the earth dam. The analyses in several stages encountered the
estimate of initial stresses in the dam, excavation of the upper ten meters
(during dam crest reconstruction), the placement of the diaphragm,
reconstruction of the dam crest and the raising of water level in the
reservoir. The analyses are compatible with the planned design actions in
dam reconstruction.
The parametric study covered the range of expected stiffness and
strength parameters of the earth materials and the material of diaphragm,
as well. The numerical analyses using the finite element method were
performed considering the elastoplastic behaviour and nonlinear
relationships between the effective stresses and stiffness or strength of
earth materials.
The computer program FLAC was used in analyses which enables solving of
such complex deformation problems in geotechnics.
Keywords: stress-strain analysis, Peruča dam
- Type of paper
: Survey/Study
Title: Report on the Mahabad Dam Safety, Mahabad Dam Remedial
Works: Phase I
- Authors:
- Szavits-Nossan, Antun (45750)
- Žarković, Vladimir
- Lipić, Zdravko
- Karbasi, Mahmood Seid
Ordering party: Ministry of Energy, Islamic Republic of Iran
Institution depot: Elektroprojekt
Year: 1992
Number of pages: 62
Language: engleski
Summary: Results are presented of an effort to reveal and
understandmechanisms that led to the behavior of the 47 m high Mahabad
damembankment evidenced by longterm crest settlements,
horizontaldisplacements, cracking, and tilting, as well as foundation
soilsettlements. On the basis of a comprehensive analysis ofavailable
observational data, and a review of MonthlyConstruction Reports, it was
concluded that long term embankmentdisplacements were primarily due to
consolidation of the claycore and clayey random fill in the downstream
shell, while mostof the foundation settlements occured up to the end
ofconstruction.
Monitoring data indicate that the cionsolidation process in theembankment
and the foundation ended and the embankment has atpresent attained a steady
state condition. It also hasexperienced a rapid draw down condition in its
early history.Therefore it could be concluded that the embankment is safe
forstatic loading conditions with respect to slope failures.
Due to lack of data on material properties for quick loading, andthe
provisional status of the design earthquake loadingcharacteristics, only a
rough and not very reliable estimate onseismic safety was given.
An improvement of the monitoring system, controlling seepagequantities and
piezometric heads has been suggested.Recommendations are given for future
actions on instalation of amonitoring system, investigation work for
seismic analysisincluding finalizing seismological studies, and
performinggeotechnical and geophisical site investigations. Criteria
forpossible remedial works are also given in the Report.
Keywords: embankment, dam, deformation, monitoring, damages, analysis, stability,
Other: Osnovni izvještaj sadrži i tri dodatka, pretežno nacrta:
Appendix I: Dan as Built Data and Geological Data,
Appendix II: Monitoring Data,
Appendix III: Static and Seismic Dam Analyses
- Type of paper
: Survey/Study
Title:
- Authors:
- Kovačić, Davorin (6574)
Ordering party: CONEX
Institution depot: Rudarsko - geološko - naftni fakultet
Year: 1994
Number of pages: 60
Language: hrvatski
- Type of paper
: Survey/Study
Title:
- Authors:
- Kovačić, Davorin (6574)
Ordering party: Institut građevinarstva Hrvatske, Poslovni centar Split
Institution depot: Rudarsko - geološko - naftni fakultet
Year: 1994
Number of pages: 53
Language: hrvatski
- Type of paper
: Survey/Study
Title: The Peruća dam - the analysis of impermeable cut-off wall
mechanical behaviour in Peruća lake
- Authors:
- Szavits-Nossan, Antun (45750)
- Kovačević, Meho-Saša
- Ivšić, Tomislav
Ordering party: Elektroprojekt
Institution depot: Građevinski fakultet
Year: 1994
Number of pages: 42
Language: hrvatski
Summary: The analysis of the mechanical interaction of water-tight
cantilever diaphragm and dam body included the nonlinear stress-strain
analyses of the earth dam. The analyses in several stages encountered the
estimate of initial stresses in the dam, excavation of the upper ten meters
(during dam crest reconstruction), the placement of the diaphragm,
reconstruction of the dam crest and the raising of water level in the
reservoir. The analyses are compatible with the planned design actions in
dam reconstruction.
The parametric study covered the range of expected stiffness and
strength parameters of the earth materials and the material of diaphragm,
as well. The numerical analyses using the finite element method were
performed considering the elastoplastic behaviour and nonlinear
relationships between the effective stresses and stiffness or strength of
earth materials.
The computer program FLAC was used in analyses which enables solving of
such complex deformation problems in geotechnics.
Keywords: stress-strain analysis, Peruča dam
- Type of paper
: Invited lecture
Title: Vlasta Szavits-Nossan, Consolidation Theory
Institution: Geotehnički fakultet
Year: 1995