R. Szepeshazi

6506611770

Publications - 5

Modeling of soil-stucture interaction in bridge design

J. Szép R. Szepeshazi

Publication Name: Icsmge 2017 19th International Conference on Soil Mechanics and Geotechnical Engineering

Publication Date: 2017-01-01

Volume: 2017-September

Issue: Unknown

Page Range: 859-862

Description:

In bridge design use of integrated models for analysing of substructure (including foundation) and subsoil together with superstructure is quite rare, a separated approach using two interconnected models is more often. In this paper we present methods to use in structural modeling for modeling substructure, foundation and soil with emphasis on piles. In the simplest method prescribed displacements are applied on rigid supports to represent all the effects of pile foundation and surrounding soil. An advanced approach is the use of springs for modelling their complex response. Some designers include the piles in the superstructure model too, and require spring parameters for modeling the soil beside each pile element. We present how to determine spring characteristics for these approaches based on traditional analytical geotechnical consideration or force-displament curves measured or simulated. Another probably a better way could be to represent the entire support response in the superstructure modeling, especially in the case of abutments. The complex interactions can be analysed only by advanced geotechnical FEM modeling and the results can be used for deriving of simplified spring parameters as shown in this paper.

Open Access: Yes

DOI: DOI not available

Levels of what and how in the education of geo-engineering on problematic soils

R. Szepeshazi Peter Scharle R. P. Ray

Publication Name: Geotechnical Engineering

Publication Date: 2015-12-01

Volume: 46

Issue: 4

Page Range: 110-113

Description:

Majority of recent studies discussing the development issues of civil engineering education focus the attention on the innovative teaching and learning methods. Evolution of the engineers' habit of mind demands, in addition, the conscious harmonization and synchronization of educational level, basic mathematical and mechanical preliminaries and professional content. Consideration of the interdependence among these factors results in some conclusions usable for educators interested in creating innovative curricula. Distinction between BEng and MEng levels of competence has to be identified properly. Geotechnical works on or in problematic soils deserve this attention, in particular.

Open Access: Yes

DOI: DOI not available

Numerical modeling of levees according to Eurocode 7

Edina Koch None Wolf R. Szepeshazi

Publication Name: Geotechnical Engineering for Infrastructure and Development Proceedings of the Xvi European Conference on Soil Mechanics and Geotechnical Engineering Ecsmge 2015

Publication Date: 2015-01-01

Volume: 4

Issue: Unknown

Page Range: 2019-2024

Description:

In many European countries, flood protection and development of levees has a great importance due to ever-increasing flood levels. The final version of Eurocode 7 includes three chapters that govern the levee design. They suggest mainly conventional concepts and principles but do not provide a comprehensive design methodology for use in practice as it was formerly given in the national standards. Analytical seepage calculations used in present-day practice are based on numerous simplifying assumptions, so they often do not simulate actual conditions. The method of slices, generally used for stability analysis, is sometimes criticized for theoretical reasons. Recently, development of numerical modeling and software have employed coupled finite element analysis for mechanical and hydraulic problems. A single FEM model can apply to levee design, stability analysis, underseepage and through seepage, and analysis of seepage forces. This paper reports research results gained about modeling levees by Plaxis to meet the requirements of the Eurocode 7.

Open Access: Yes

DOI: DOI not available

Laboratory tests and numerical modeling for embankment foundation on soft chalky silt using deep-mixing

Edina Koch R. Szepeshazi

Publication Name: 18th International Conference on Soil Mechanics and Geotechnical Engineering Challenges and Innovations in Geotechnics Icsmge 2013

Publication Date: 2013-01-01

Volume: 3

Issue: Unknown

Page Range: 2521-2524

Description:

The deep-mixing is nowadays world-wide accepted method as a ground treatment technology to improve the permeability, strength and deformation properties of soils. Binders, such as lime or cement are mixed in-situ with the soil by rotating mixing tools. The method is undergoing rapid development, particularly with regard to its range of applicability, cost effectiveness and environmental advantages. The paper describes the results of laboratory tests on chalky silt samples mixed with cement of different content. The influence of the different mixing parameters on the unconfined compression strength and deformation modulus is shown and evaluated. Typical results of the laboratory tests were used in numerical modeling with PLAXIS 3D as input parameters to study the behavior of a 4 m high embankment constructed on this soil improved by deep mixed columns with different spacing and diameters. The parameters of the soil improvement technique were analyzed to study their influence on the settlement and the stability of the embankment. The trends of the calculation outputs are shown and evaluated.

Open Access: Yes

DOI: DOI not available

On the K0 factor

R. Szepeshazi

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 1994-01-01

Volume: 38

Issue: 1

Page Range: 127-135

Description:

After presenting the significance of the K0 factor the paper discusses some aspects of the formulae for the coefficient of earth pressure at rest, mainly the well-known Jaky's equation. An improvement for the critical Jaky's assumption is introduced and a modified K0 ...φ relationship is deduced. All the formulae originating from Jaky's idea and some other continuum mechanical or speculative equations are tested against 153 measured data. The original Jaky's equation, and the ones from Vierbiczky and Matsuoka-Sakakibara were found to be the best. -from Author

Open Access: Yes

DOI: DOI not available