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Bojana Dolinar, 2015, predgovor, spremna beseda

Ključne besede: editorials, scientific journals, geomechanics, geotechnical engineering
Objavljeno: 15.06.2018; Ogledov: 7; Prenosov: 0
.pdf Celotno besedilo (38,79 KB)
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New Architecture of The Berane Airport
Ivan Pićurić, 2018, magistrsko delo/naloga

Opis: This Master's Thesis explores the concept of the New Berane Airport that will serve as a turning point for improving the winter tourism offer of Montenegro and the region, thereby attracting a greater number of tourists to the country. The new facility must follow the guidelines of modern architecture, modern design, and the surrounding mountain landscapes, which represents an additional challenge in terms of construction and design. The main aim is to create an efficient structure, a new regional aviation centre, with well-designed transport links that will meet the needs of a large number of passengers and visitors from the region and the rest of the world. The visual aspects of the structure must be in line with the dominant type of architecture in the municipality of Berane, which is why the use of local materials and traditional elements has been foreseen. The new urban plan will follow the existing plan, although its capacity and content will be expanded in accordance with the former plans for the airport. In the planning phase, appropriate use of airport and traffic manuals is essential.
Ključne besede: airport, architecture, concrete, shell roof, glass facade, tourism, transport, parametric design, regional centre, Berane
Objavljeno: 15.06.2018; Ogledov: 56; Prenosov: 34
.pdf Celotno besedilo (38,54 MB)

New computational models for better predictions of the soil-compression index
Ahmet Demir, 2015, izvirni znanstveni članek

Opis: The compression index is one of the important soil parameters that are essential for geotechnical designs. Because laboratory and in-situ tests for determining the compression index (Cc) value are laborious, time consuming and costly, empirical formulas based on soil parameters are commonly used. Over the years a number of empirical formulas have been proposed to relate the compressibility to other soil parameters, such as the natural water content, the liquid limit, the plasticity index, the specific gravity. These empirical formulas provide good results for a specific test set, but cannot accurately or reliably predict the compression index from various test sets. The other disadvantage is that they tend to use a single parameter to estimate the compression index (Cc), even though Cc exhibits spatial characteristics depending on several soil parameters. This study presents the potential for Genetic Expression Programming (GEP) and the Adaptive Neuro-Fuzzy (ANFIS) computing paradigm to predict the compression index from soil parameters such as the natural water content, the liquid limit, the plastic index, the specific gravity and the void ratio. A total of 299 data sets collected from the literature were used to develop the models. The performance of the models was comprehensively evaluated using several statistical verification tools. The predicted results showed that the GEP and ANFIS models provided fairly promising approaches to the prediction of the compression index of soils and could provide a better performance than the empirical formulas.
Ključne besede: compression index, statistical analysis, genetic expression programming, adaptive neuro-fuzzy, empirical equations
Objavljeno: 14.06.2018; Ogledov: 39; Prenosov: 0
.pdf Celotno besedilo (274,65 KB)

Relationship between the compressive and tensile strengths of lime-treated clay containing coconut fibres
Vivi Anggraini, Bujang Huat, Afshin Asadi, Haslinda Nahazanan, 2015, izvirni znanstveni članek

Opis: The effects of coconut fibre on the mechanical characteristics of lime-treated clay are investigated in this study. The lime-treated clay specimens were prepared with a variety of coconut-fibre contents, i.e., 0.5%, 1%, 1.5% and 2%, in terms of the weight of dry soil. The stabilized specimens were tested at 7, 28 and 90 days after the treatment in order to observe the evolution of the mechanical resistance with time. The results of the unconfined compressive strength tests were used to determine the relationships between the compressive strengths and the indirect tensile strengths of the stabilized soil. Furthermore, the optimum percentage of coconut fibre mixed in the soil/lime mixtures was 1% of the dry mass and reinforcement at 90 days increases the peak compressive strength and the indirect tensile strength. Coconut-fibre inclusion changes the brittle behaviour of the lime-treated clay soil to give it a more ductile character.
Ključne besede: coconut fibre, lime, compressive strength, indirect tensile strength, clay soil, failure characteristics
Objavljeno: 14.06.2018; Ogledov: 37; Prenosov: 0
.pdf Celotno besedilo (755,61 KB)

Analysis of a dilatometer test in over-consolidated sediments, basin of the Duero river, Spain
Félix Escolano Sánchez, Manuel Bueno Aguado, 2015, izvirni znanstveni članek

Opis: A dilatometer test is a useful method for in-situ geotechnical surveys. It can be compared with the results obtained using a mathematical model. The mathematical model of concentric rings shown in this article is governed by the constitutive equation of the “Hardening Soil Model”. A large number of tests made on the Dueñas Geological Facies, with a consistency ranging from firm clays to soft rocks, are compared to the model results. In this way, the “Hardening Soil Model” parameters are adjusted to the Dueñas Facies materials.
Ključne besede: Dueñas, geotechnical parameters, hardening soil model, soft rocks and clays deformation
Objavljeno: 14.06.2018; Ogledov: 44; Prenosov: 0
.pdf Celotno besedilo (409,71 KB)

Implementation and verification of a geosynthetic-soil interface constitutive model in the Geogrid element of FLAC$^{3D}$
Wu Haimin, Shu Yiming, Dai Linjun, Teng Zhaoming, 2015, izvirni znanstveni članek

Opis: Due to the complexity of geosynthetic-soil interactions, the simple interface constitutive models embedded in the geosynthetic elements of general computing software cannot satisfy the requirements for a numerical simulation of different geosynthetic-soil interface behaviours. Based on the direct shear test results of a composite geomembrane (CGM) and polyurethane (PUR) mixed crushed stones interface, a nonlinear elastic, perfectly plastic model was used to describe the interface behaviours. The method of incorporating an interface constitutive model into the Geogrid element of a fast Lagrange analysis of continua in three dimensions (FLAC3D) procedure was presented in detail through a user-defined program in the FISH environment. Then the incorporated model of the Geogrid element was used to simulate the direct tests of the CGM-PUR mixed crushed stones interface. The results of the numerical tests confirmed the validity and reliability of the incorporated model. The method and program flowchart for implementing the nonlinear elastic, perfectly plastic interface constitutive model into the Geogrid element can provide a reference for users who want to simulate other geosynthetic-soil interface behaviours with FLAC3D.
Ključne besede: geosynthetic-soil interface, constitutive model, numerical modelling, FLAC3D, geogrid element
Objavljeno: 14.06.2018; Ogledov: 29; Prenosov: 0
.pdf Celotno besedilo (269,05 KB)

Influence of the virtual strain rate of noncohesive granular media on the discrete element method
Kiichi Suzuki, 2015, izvirni znanstveni članek

Opis: The discrete element method (DEM) is an alternative computational tool for augmenting laboratory experiments because of its advantages in detailing macro- and micro-mechanical information. However, it should be noted that the DEM does not usually consider the convergence for each time step, because of the necessity for a huge calculation time. In that case, it indicates that the uniqueness of the solution is not guaranteed, except in the case of a very small strain rate, even though the behavior looks qualitatively reasonable. At first, the influence of strain rate among numerically imaginary input parameters for a non-cohesive material was investigated for monotonic, biaxial shear tests. Then, new findings were obtained from the DEM simulations. Strain rate has a significant influence on the shear behavior, especially after the peak strength of dense specimens. A quasi-static steady state exists, not a static steady state. The “strong” fabric ratio is closely related to the stress ratio. The maximum slip coordination number occurs around the phase-transformation ratio and the shear band appears around the peak strength.
Ključne besede: discrete element method, DEM, induced anisotropy, quasi-static steady state, strain rate, uniqueness
Objavljeno: 14.06.2018; Ogledov: 21; Prenosov: 0
.pdf Celotno besedilo (690,97 KB)

A three-dimensional static numerical model of a complex underground structure in high squeezing ground
Tina Marolt Čebašek, Jakob Likar, 2015, izvirni znanstveni članek

Opis: The present study assesses high squeezing ground confirmed by empirical and semi-empirical theories. High squeezing ground is often present in underground constructions at great depths, but it is hardly ever researched separately from light and fair squeezing ground. A three-dimensional, static numerical model is developed for a complex underground structure consisting of a shaft, a silo, and a mine roadway at great depth, which is certainly in high squeezing ground. Furthermore, a solution for the entire structure based on shotcrete with incorporated yielding elements is provided. The yielding elements, in general, absorb the strain energy by compressing at a relatively constant stress, but without rebounding. A three-dimensional, static numerical model of a support system with incorporated yielding elements is established in order to demonstrate that the presented forces are under control. Therefore, a failure of the lining is avoided because the stresses in the shotcrete lining are below its load-bearing capacity. It can be concluded that yielding elements incorporated in the shotcrete lining play an important role in the support solution in high squeezing ground.
Ključne besede: high squeezing ground, numerical model, underground structures, deformations, yielding support element
Objavljeno: 14.06.2018; Ogledov: 27; Prenosov: 0
.pdf Celotno besedilo (606,20 KB)

Bojana Dolinar, 2015, predgovor, spremna beseda

Ključne besede: editorials, scientific journals, geomechanics, geotechnical engineering
Objavljeno: 14.06.2018; Ogledov: 9; Prenosov: 0
.pdf Celotno besedilo (36,31 KB)
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Design optimization for symmetrical gravity retaining walls
Erol Sadoğlu, 2014, izvirni znanstveni članek

Opis: The optimization for symmetrical gravity retaining walls of different heights is examined in this study. For this purpose, an optimization problem of continuous functions is developed. The continuous functions are the objective function defined as the cross-sectional area of the wall and the constraint functions derived from external stability and internal stability verifications. The verifications are listed as the overturning, the forward sliding, the bearing capacity, the shears in the stem and the bendings in the stem. The heights of the walls are selected as 2.0, 3.0, and 4.0 m in order to investigate the outline of the optimum cross-section and the effect of the wall height on the outline. Additionally, the physical and mechanical properties of the soil are kept constant in order to compare only the effect of the height on the geometry. The upper and lower bounds of the solution space are specified to be as wide as possible and the minimum dimensions suggested for the gravity retaining walls are not taken into account. A common feature of the optimum cross-sections of walls with different heights is to have a very wide lower part like a wall foundation and a slender stem. However, other than the forward sliding constraint, the bending constraints are active at the optimum values of the variables.
Ključne besede: gravity retaining wall, nonlinear optimization, continuous variables, interior point method
Objavljeno: 14.06.2018; Ogledov: 12; Prenosov: 2
.pdf Celotno besedilo (168,77 KB)

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