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1.
Retaining structure in demanding ground conditions: PK-16, road Hrastnik - Zidani Most
Aleksandr Sokolov, 2021, master's thesis

Abstract: The master thesis presents the findings of the review of the design documentation of PGD plans for the PK-16 retaining structure, reconstruction of the G2-108 Hrastnik - Zidani Most road and deviation of the G1-5 Rimske Toplice - Zidani Most - Radeče road. The PK 16 retaining structure is foreseen between the Sava riverbed and the new road. The length of the retaining structure is substaintal (approx. 1140 m), the morphology of the terrain along the wall varies greatly. However, due to the erosion of the Sava River, it is estimated that the wall will need to be deep or corrosion protection should be constructed. Temporary security and work platforms based on the Sava River Basin (which is already impounded and quite deep in this part) will be required. The retaining structure is designed as a vertical cantilever wall that is on the underside rigidly fixed to the horizontal foundation plate. On the bulk of the structure, the foundation plate is supported by piles in two rows. The vertical wall at the top passes into a horizontal cantilever along which a corridor with a fringe runs. The controlling calculations were done employing a computational 2D model that takes into account the elastoplastic Mohr - Coulomb model for soil and the elastic model of concrete structures. The accompanying geotechnical calculations of the retaining structure in profiles P283 and P299 were compared with the analyses made in the design project to confirm the possibility of carrying out the proposed structures.
Keywords: civil engineering, geotechnical design, retaining structures, cantilever walls, piles
Published: 13.10.2021; Views: 35; Downloads: 8
.pdf Full text (2,99 MB)

2.
Remediation of County road section ž6004
Jure Župan, 2019, master's thesis

Abstract: Master thesis represents the description of investigative geophysical, geotechnical as well as laboratory works that precede the design of a new pavement structure, within the remediation of County road Ž6004 damaged during heavy floods. As the first variant of remediation, the design of the new road structure is described using Croatian standard HRN U.C4.012, and as a second variant, the new design solution of road structure constructed using geosynthetic. Procedures for obtaining the key parameters required for designing using these methods are also described.
Keywords: civil engineering, remediation, investigative works, pavement structure, geosyntetics, HRN, reinforcing
Published: 03.09.2019; Views: 455; Downloads: 70
.pdf Full text (2,64 MB)

3.
The assesment of pile shaft resistance based on axial strain measurements during the loading test
Andrej Štrukelj, Stanislav Škrabl, Ksenija Štern, Janko Logar, 2005, original scientific article

Abstract: Near Maribor, a new bridge over the Drava river is being under construction. Before the main works actually started, static and dynamic loading tests of piles were performed. The goal of the static loading test was to determine the bearing capacitiy of the test pile. It was also interesting to determine the share of the axial load distributed on the shaft and pile toe. In order to measure the distribution of the axial force along the pile, a specially made steel canal was built in the pile before concreting. Inside this canal the strain gauges were distributed evenly at the distance of one meter. The strains were measured for each loading phase in all measuring points. The distribution of the axial force was assessed from the obtained results and based on the distribution of the axial force the shaft resistance could be determined. The unexpectedly high bearing capacity of the pile shaft made the obtained results highly interesting. In this paper, measuring methods and measuring results are discussed. Behaviour of the pile and the soil during the loading test were also modelled by axial symmetric and three dimensional models. The calculated and measured results show a very good agreement.
Keywords: civil engineering, bridges, soil mechanics, pile shaft resistance, loading test, strain measurements, elastoplastic soil modelling, finite element method
Published: 16.05.2018; Views: 717; Downloads: 39
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4.
The anchored pile wall optimization using NLP approach
Helena Vrecl-Kojc, 2005, original scientific article

Abstract: The type of a retaining structure as well as the structure configuration mainly depends on geological conditions. If geological, urban and other data allow an alternative, the costs should also be considered as an important factor. In geotechnical practise, pile walls are especially used in excavations, in the erection of traffic facilities and in the sanitation of landslides. This paper is aimed at presenting economical differences between cantilever and anchoring pile walls and the impact of different parameters on costs. The optimization method, which uses mathematical programming, gives an optimal solution to geometry, self-manufacturing costs, and other characteristics of the structure in a uniform optimization process. This paper presents the optimization process using the nonlinear programming (NLP) approach for the anchored pile wall. The application presented only serves to confirm the effectiveness of the proposed optimization method. Therefore, the retaining structure is situated in homogeneous non-cohesive soil at three different soil friction angles of 35°, 30° and 25°. The generalized analytical method, the USA method, which was first introduced by Bowles [3], isused in the application. The analysis of the results shows the impact of parameters, the main controlling factors, configuration geometry and savings. The optimal results allowed from 18 up to 47 per cent savings compared to the cantilever pile wall depending on ground and structure input data and the excavation depth.
Keywords: civil engineering, optimum design, retaining structures, USA analytical method, nonlinear programming
Published: 16.05.2018; Views: 574; Downloads: 41
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5.
Cyclic liquefaction potential of lacustrine carbonate from Julian Alps
Bojan Žlender, Stanislav Lenart, original scientific article

Abstract: This paper presents the liquefaction studies of lacustrine carbonate silt from the Julian Alp landslide Stože. Geological conditions of the region and geomechanical characteristics of the ground were investigated. The research project was performed with the intention to determine the effects of cyclic loading on lacustrine carbonate silt. Investigation with 77 cyclic triaxial tests was performed on universal triaxial apparatus Wykeham Farrance UP 100 TR, in the Laboratory of soil mechanics, Faculty of Civil Engineering, University of Maribor. The essential equipment comprises cylindrical triaxial apparatus with a cell, a press with appurtenant electro-mechanic equipment, measuring equipment, and computer hardware and software equipment. Specimens with dimensions of height = 140 mm and diameter = 70 mm were saturated, then subjected to the arbitrary initial isotropic stress state and consolidated with vertical and radial draining, and then loaded with distortional loading of chosen dynamical axial force (frequency f = 1 Hz). A set of tests with a spectrum of different stress states and cyclic loading were performed. This research showed that lacustrine carbonate silt is a highly sensitive material.The resistance to liquefaction was somewhat higher than that of typical clean sand, but a perceivable excess pore pressure generation, which causes the decrease of strength parameters, was noticed. Test results of cyclic triaxial tests indicate dynamic characteristics of lacustrine carbonate silt and wide applicability of the test method.
Keywords: civil engineering, geomechanics, soil investigations, lacustrine carbonate silt, cyclic triaxial tests, liquefaction potential, shear modulus, damping ratio, cyclic stress ratio, pore pressure ratio
Published: 15.05.2018; Views: 712; Downloads: 33
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6.
Green's function for an elastic layer loaded harmonically on its surface
Tomaž Pliberšek, Andrej Štrukelj, Andrej Umek, 2005, original scientific article

Abstract: The Green's function in surface displacement plays an important role in soil structure interaction. In evaluating the Green's function, several difficulties occur because it is formulated in the infinite integral form. This paper outlines a method of analyzing the steady-state dynamic response of an elastic layer subjected to general point load excitation. It is assumed that the load is applied at the surface. The application Hankel integral transform, to the governing differential equations and boundary conditions yields the response displacements at the surface in integral representation. It will be shown that these semi-infinite integrals can be reduced to the integral with the finite range of integration, which can be efficiently taken numerically. The numerical results are presented, which show the efficiency of the developed procedure.
Keywords: civil engineering, geomechanics, soil-structure interaction, layered halfspace, Green's function, elastodynamics
Published: 15.05.2018; Views: 774; Downloads: 57
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7.
Analytical and numerical factor of safety (uls) calculations on reinforced embankments
Tadej Vidnar, 2017, master's thesis

Abstract: This thesis deals with factor of safety calculations on geogrid reinforced embankments carried out by commonly used limit equilibrium (LEM) and finite element methods (FEM). The study utilize LEM based software SLIDE and FEM based software PHASE2. The main difference between these two approaches is that the LEM methods are based on the static of equilibrium whereas FEM methods utilise the stress strain relationship. Unlike to LEM, numerical analysis also computes displacements. For practical example of a geogrid reinforced embankment the factor of safeta (FoS) is calculated. Reinforced soil structures are nowadays utilized for a lot of civil engineering applications. Traditionally, the design of geogrid reinforced soil is performed using analytical methods (LEM). Unfortunately, these methods missing the fundamental physics of stress-strain relationship and are therefore not able to compute a realistic stress distribution. In first step of the analysis the FoS is carried out with analytical approach. The most rigorous LEM methods, Bishop’s, Spencer’s and Morgenstern-Price are selected and the FoS for circular and polygonal slip surface is calculated. In second step of the analysis the FoS is carried out with numerical approach. Shear strength reduction (SSR) procedure was performed to determine the critical strength reduction factor (SRF) which represents the FoS of slope.
Keywords: civil engineering, finite element method (FEM), limit equilibrium method (LEM), embankments, slope stability, bearing capacity failure, geosynthetics, geogrids, shear strains
Published: 27.09.2017; Views: 652; Downloads: 126
.pdf Full text (17,05 MB)

8.
Usage, Potentials and Challenges of Building Information Modelling (BIM) in Slovenia, Austria, Germany and Switzerland
Amanda Jus, 2017, master's thesis

Abstract: In the master’s thesis, the main potentials, challenges and usage of Information Building Modelling (BIM) in Slovenia, Austria, Germany and Switzerland are presented, including its, because BIM is currently the most widely discussed topic in civil engineering. The study was based on a questionnaire that was carefully created at the HSLU (Hochschule Luzern) in Switzerland. We participated in the last phases of its development. With the help of the results of the questionnaire, we evaluated the current usage and acceptance of BIM among all participants in the building process.
Keywords: civil engineering, BIM, Building Information Modelling, BIM metrics
Published: 25.09.2017; Views: 1173; Downloads: 144
.pdf Full text (6,88 MB)
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9.
Towards a virtual product model
Andrej Tibaut, Danijel Rebolj, 2003, original scientific article

Abstract: Today, many researchers working on the information management process in construction recognise the problem of modelling complex product-related data structures. Furthermore, many experts doubt whether an all-inclusive-product-model is a solution for an integrated information environment that should efficiently support the life cycle of a product. It seems that rich experiences in product modelling gathered during the last decade do not necessarily lead to better models but rather to the awareness the more complex the product models are, the more rgid and less usable they become in practice. The paper first summarises some deficiencies of complex product models and then introduces a new conceptual solution, called "virtual product model", which is based on the on the decomposition of a conventional product model. The concept investigates the dissharmony in the structure and semantics of distributed (virtual) parts by applying agent technology and then the tuple space communication model.
Keywords: gradbeništvo, gradnja objektov, informacijska tehnologija, informacijski sistemi, baze podatkov, integracija, management informacij, upravljanje znanja, izmenjava podatkov, produktni modeli, virtualni produktni modeli, civil engineering, building construction, information technology, information systems, databases, integration, information management, knowlege management, data exchange, product models, virtual product models
Published: 10.07.2015; Views: 1518; Downloads: 72
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10.
Interuniversity postgraduate program in construction IT
Fátima Farinha, Ricardo Gonçalves, Danijel Rebolj, Karsten Menzel, 2003, published scientific conference contribution

Abstract: This paper reports on an interuniversity collaboration, funded by Erasmus Program, which develops a European Master course in Construction Information Technology (ITC) to complement the existing portfolio of postgraduate programsand to meet the growing demand for such skills in the construction industry all over the world. The curriculum is defined in a way that courses will be offered from different universities in Europe, as face-to-face education as well as long distance learning courses, which will give students the possibility not just to study in other countries, but also to tailor the program to their own needs and wishes. Students will not only get the best subjects but will also get the very important experience of different universities and cultures as well as of using information technology (IT) in the learning process. The paper concludes presenting and discussing ITC@EDU network, which main purpose is to support and link together teachers in the area of IT in construction. Therefore, the significance of the work done exceeds the postgraduate program, as it has become the linking point for the further development of ITC education globally.
Keywords: civil engineering, information technology, interuniversity prostgraduate study programme, learning environment, curriculum, virtual classroom, virtual university, Socrates Erasmus
Published: 01.06.2012; Views: 1355; Downloads: 30
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