Thesis supervisor: András Mahler
Location of studies (in Hungarian): Geotechnika és Mérnökgeológia Tanszék Abbreviation of location of studies: BMEGM
Description of the research topic:
Design of pavements is a frequent and important task in the civil engineering practice. Traditional design methods mostly rely on calculation methods that consider elastic material behaviour and the soil is typically considered as a constant subgrade reaction. Numerical analyses performed using advanced material models can demonstrate that the stress state caused by a surface load induce non-uniform stiffness distribution in the subgrade and in the soil. Thus considering more accurate soil behaviour can result in more realistic numerical simulation and enable more reliable design.
Another important problem besides the stress-state dependent stiffness, is the fact that repeated loading causes accumulating deformation in the subsoil. Numerical modelling of this phenomenon is a challenging task that cannot be handled by the means of widely used elastoplastic material models. In case of similar problems (e.g. earthworks of high speed trains) the use of hypoplastic material models proved to be the most effective, although simulating the whole lifetime is not realistic due to computational demands and extremely high number of cycles. The major goal of this PhD research is to study the possibilities of modelling the accumulated soil deformation due to repeated loading. The following topics shall be studied in details:
• review and evaluation of available hypoplastic material models;
• parameter identification of hypoplastic material model, determining the parameters of typical earthwork materials;
• set of numerical analysis to compute the accumulating deformation induced by repeated loading;
• extrapolation possibilities to estimate accumulating deformation due to large number of repeated loading.
Number of students who can be accepted: 1
Deadline for application: 2024-05-31
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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