36 research outputs found
Usage of Empirical-Statical-Dynamical (ESD) method for data extrapolation in Tunnel Construction
No full textThis article describes a methodology that shows how it is possible to integrate all these approaches in a problem for extrapolation of the parameters for hydrotechical tunnels. During the design process for tunnels in hydrotechics, one of the main problems is how to extrapolate the deformability and shear strentgh rock mass parameters from the zone of testing to the whole area (volume) of interes for interaction analyses between structure abd natural environments. Computers development in recent decades has contributed to the development of numerical calculation method in rock mechanics which enabled new and wider possibilities of stress and deformation calculation. This had significantly stimulated the development of rock mechanics and tunneling as scientific and technical discipline as well as the wider application of research results into practice
Analysis of stress-deformation state in the rock massif using Z-SOIL program
No full textThe Rock Mass and artificial constructions, during the changes of the stress-strain conditions are involved in specific types of interactions. The case explained in the article is a very specific, having in mind the closely spaced arch dam and existing intake tunnel. In order to insure the data for analyses, it is necessary to define the reliable constitutional model or analyses. According to the authors opinion, the combination of discontinual Rock Mass models and models for analyzing of quasi-continual media is a prerequisite for successful design and construction
EVALUACIJA STOPA DEGRADACIJE ŽELEZNIČKOG KOLOSEKA NA OSNOVU TRENDOVA TQI: STUDIJA SLUČAJA DEONICE KOLAŠIN–PODGORICA
No full textUnderstanding the rate of track degradation is essential for effective railway infrastructure management, particularly in mountainous and geotechnically unstable regions. This paper presents a comprehensive analysis of the track geometry degradation on the Kolašin–Podgorica railway section in Montenegro, using the Track Quality Index (TQI) as the primary indicator. TQI values from three consecutive inspection periods (2017–2019, 2019–2022, and 2022–2024) were analyzed to compute degradation rates (ΔTQI) across all track segments. The results were visualized through spatially distributed line graphs, enabling the identification of segments with progressive geometric deterioration.The analysis reveals a recurring pattern: several sections demonstrate improvement following tamping interventions, yet degrade again within a short period, indicating deeper structural or geotechnical issues. Particular attention is given to sections located on bridges, in tunnels, and near stations—areas associated with increased dynamic loads and limited substructure resilience. An overlay of maintenance data and structural object locations further strengthens the causal interpretation.The findings support the prioritization of high-risk segments for targeted interventions beyond routine maintenance. This degradation-based evaluation framework contributes to data-driven decision-making for long-term railway asset management, combining infrastructure condition assessment with spatial engineering analytics.Razumevanje brzine degradacije koloseka je od suštinskog značaja za efikasno upravljanje železničkom infrastrukturom, posebno u planinskim i geotehnički nestabilnim područjima. U ovom radu predstavljena je sveobuhvatna analiza degradacije geometrije koloseka na deonici Kolašin–Podgorica u Crnoj Gori, koristeći Indeks kvaliteta koloseka (TQI) kao primarni pokazatelj. Vrednosti TQI izmerene u tri uzastopna perioda inspekcije (2017–2019, 2019–2022 i 2022–2024) analizirane su za izračunavanje stopa degradacije (ΔTQI) duž svih sekcija pruge. Rezultati su vizualizovani prostorno distribuiranim grafikom, omogućavajući identifikaciju delova pruge sa progresivnim geometrijskim narušavanjem.Analiza otkriva ponavljajući obrazac: nekoliko sekcija pokazuje poboljšanje nakon intervencija podbivanja, ali se u kratkom roku ponovo javlja degradacija, što ukazuje na dublje strukturne ili geotehničke probleme. Posebna pažnja posvećena je sekcijama smeštenim na mostovima, u tunelima i u blizini stanica — područjima povezanim sa pojačanim dinamičkim opterećenjima i ograničenom otpornošću potkrovnog stroja. Preklapanje podataka o održavanju i lokacijama objekata još više ojačava uzročnu interpretaciju.Dobijeni nalazi podržavaju prioritizaciju visokorizičnih sekcija za ciljane intervencije koje prevazilaze redovno održavanje. Ovaj okvir za procenu zasnovan na degradaciji doprinosi donošenju odluka zasnovanih na podacima za dugoročno upravljanje železničkom imovinom, kombinujući procenu stanja infrastrukture sa prostornom inženjerskom analizom
EVALUATION OF RAILWAY TRACK DEGRADATION RATE BASED ON TQI TRENDS: A CASE STUDY OF THE KOLASIN–PODGORICA SECTION
No full textUnderstanding the rate of track degradation is essential for effective railway infrastructure management, particularly in mountainous and geotechnically unstable regions. This paper presents a comprehensive analysis of the track geometry degradation on the Kolašin–Podgorica railway section in Montenegro, using the Track Quality Index (TQI) as the primary indicator. TQI values from three consecutive inspection periods (2017–2019, 2019–2022, and 2022–2024) were analyzed to compute degradation rates (ΔTQI) across all track segments. The results were visualized through spatially distributed line graphs, enabling the identification of segments with progressive geometric deterioration.
The analysis reveals a recurring pattern: several sections demonstrate improvement following tamping interventions, yet degrade again within a short period, indicating deeper structural or geotechnical issues. Particular attention is given to sections located on bridges, in tunnels, and near stations—areas associated with increased dynamic loads and limited substructure resilience. An overlay of maintenance data and structural object locations further strengthens the causal interpretation.
The findings support the prioritization of high-risk segments for targeted interventions beyond routine maintenance. This degradation-based evaluation framework contributes to data-driven decision-making for long-term railway asset management, combining infrastructure condition assessment with spatial engineering analytics
PRISTUP DEFINISANJU GRANIČNE VREDNOSTI ZAUSTAVNOG VIDNOG RASTOJANJA NA PUTEVIMA U REPUBLICI SEVERNOJ MAKEDONIJI
No full textThe most of the existing road network in the Republic of North Macedonia consists of sections that in the past were designed to provide the most durable and permanent engineering solutions of the carriageway, with minimal commitment to the road geometry. The visibility on the road is a key condition that would significantly contribute to better driving dynamics as well as to road safety. An analysis of Stopping Sight Distance (SSD) on all main roads was conducted within the paper. The visibility is checked simultaneously, through video recordings and CAD drawings, and is recorded tabularly by sections. In the analysis, checks are treated in two projections with additional subtypes: Horizontal solution (open route and intersections) and vertical solution (for convex and concave curves). The obtained values are quantified according to the length of each section, thus determining the individual sizes for each type. According to the resulting diagram of all the sections and the range from minimum to maximum, an economically acceptable visibility limit is defined through which all existing and future roads are weighted and it is defined whether they have a satisfactory visibility or not.Veći deo postojeće putne mreže u Republici Severnoj Makedoniji sastoji se od deonica koje su u prošlosti projektovane da pruže najdugotrajnija i najstabilnija inženjerska rešenja za kolovoz, sa minimalnim akcentom na geometriju puta. Vidljivost na putu je ključni uslov koji značajno doprinosi boljoj dinamici vožnje kao i bezbednosti saobraćaja. U okviru rada sprovedena je analiza zaustavnog vidnog rastojanja (Stopping Sight Distance - SSD) na svim magistralnim putevima. Vidljivost je istovremeno proverena putem video snimaka i CAD crteža, a podaci su tabelarno zabeleženi po deonicama. U analizi su provere tretirane u dve projekcije sa dodatnim podtipovima: horizontalno rešenje (otvorene trase i raskrsnice) i vertikalno rešenje (za konveksne i konkavne krivine). Dobijene vrednosti su kvantifikovane prema dužini svake deonice, čime su određene pojedinačne veličine za svaki tip. Prema rezultujućem dijagramu svih deonica i rasponu od minimalne do maksimalne vrednosti, definisana je ekonomski prihvatljiva granična vrednost vidljivosti na osnovu koje se vrednuju svi postojeći i budući putevi, kako bi se utvrdilo da li imaju zadovoljavajuću vidljivost ili ne
LONGITUDINAL DATA FOR MODELING URBAN MOBILITY ON LONG TERM
No full textThe usage of longitudinal data for modelling urban mobility is crucial when the analysis and forecast model would consider temporal modifications of behaviour of population in studied urban area. This paper treats the modelling and forecast of urban mobility on long term based on pseudo-longitudinal data. The analysis and investigated data are related to the urban area Lille in France. The examined data are carried out in 1976, 1987 and 1998, according to the standard methodology for mobility survey of households in France. The longitudinal data are made from repetitive surveys which makes possible to get insight in the behaviour dynamics. The decomposition of temporal effects into an effect of age and an effect of generation (cohort) makes possible to draw the sample profile during the life cycle and to estimate its temporal deformations. This is the origin of the “age-cohort” model for forecasting of urban mobility on long term
APPROACH FOR DEFINING THE LIMIT VALUE OF THE STOPPING SIGHT DISTANCE ON THE ROADS IN THE REPUBLIC OF NORTH MACEDONIA
No full textThe most of the existing road network in the Republic of North Macedonia consists of sections that in the past were designed to provide the most durable and permanent engineering solutions of the carriageway, with minimal commitment to the road geometry. The visibility on the road is a key condition that would significantly contribute to better driving dynamics as well as to road safety. An analysis of Stopping Sight Distance (SSD) on all main roads was conducted within the paper. The visibility is checked simultaneously, through video recordings and CAD drawings, and is recorded tabularly by sections. In the analysis, checks are treated in two projections with additional subtypes: Horizontal solution (open route and intersections) and vertical solution (for convex and concave curves). The obtained values are quantified according to the length of each section, thus determining the individual sizes for each type. According to the resulting diagram of all the sections and the range from minimum to maximum, an economically acceptable visibility limit is defined through which all existing and future roads are weighted and it is defined whether they have a satisfactory visibility or not
Road rehabilitation as an opportunity to analyse the approach in designing pavement constructions
No full textThe pavement constructions of highways built in he eighties mainly featured low bearing surfaces with cement stabilization and asphalt layers with the total thickness of up to 26 cm. The nineties were a period of rationalization, mainly referring to the reduction of the asphalt layer thickness. This paper will compare the two approaches upon the designing of pavement constructions in Serbia and in Macedonia. The paper presents subjects dealing with issues like the choice between the “long-term“ or “rationalized” pavement construction as well as with problems in the evaluation of layers of non-cohesive granulated material or the layer of cement-connected stone material. Contrary to this, the present paper does not deal with questions related to numerous diagnostic methods applied in the assessment of the pavement conditions, which is otherwise a rather important segment in the process of road rehabilitation design
Prilog principima projektovanja elemenata donjeg stroja železničke pruge u skladu sa savremenim zahtevima očuvanja životne sredine
No full textThe subject of the doctoral dissertation is the impact of railway traffic on
the environment, with the aim of preventing/mitigating water and soil
pollution in the area of railway tracks. Through a detailed analysis of the
prescribed technical conditions for the design of railway substructure
elements, the basic requirements were determined, which conditioned the
proposal of new solutions related to the substructure. An independent
investigation of the material in the railway body was carried out regarding
the presence of heavy metals. For research purposes, two methods were
used, optical emission spectrometry with induced coupled plasma (ICPOES)
and X-ray fluorescence spectrometry (XRF). Since it was confirmed
that there is a significant amount of heavy metal particles in the railway
body, the proposal of contemporary solutions for drainage channels and
elements in the railway body itself was approached in order to prevent the
release of heavy metals into the surrounding soil and environment. The
proposed solution included the replacement of conventional drainage
ditches with infiltration channels. In this regard, experimental testing of the
filter properties of four types of filters was carried out. The efficiency of
the proposed filters was verified using the ICP-OES technique, and the
filter with river aggregate of fraction 4 – 8 mm was identified as the most
efficient. The hydraulic parameters of the route case with typical (drainage)
ditches and the route case with the proposed infiltration channels were
evaluated by SWMM software. The modeling results revealed that using
infiltration channels does not result in the total utilization of the drainage
components' capacity, which improves railway safety in terms of floods
