Behaviour comparison and FEM simulation of advanced and conventional ballast aggregates
Visualitza/Obre
TFM_AngelLorenteDomingo.pdf (10,80Mb) (Accés restringit)
Input files_ALD.pdf (3,536Mb) (Accés restringit)
TFM_ALD.zip (727,2Kb) (Accés restringit)
Tipus de documentProjecte Final de Màster Oficial
Data2017-09-20
Condicions d'accésAccés restringit per decisió de l'autor
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Abstract
Since the beginning of the railways until nowadays, multiple improvements have been seen in the rolling
stock and in the infrastructure. Train power has evolved from steam to diesel and lately to electricity,
which is more efficient and faster than ever before. With regard to the infrastructures the rail
geometries have changed, fastenings now include an elastic railpad, which play a key role in the cost of
exploitation of the infrastructure. Sleepers have changed too, from wood to concrete, increasing the
safety and durability. However, there has not been any upgrade related to ballast.
Despite ballasted track has tried to be changed by the slab track, the result has not been the initially
expected. Maintenance was supposed to be cheap and unusual. Nevertheless, more often than
expected is found that it has not been built properly, and hence, maintenance is complicated and
expensive.
Recently, a new high-performance ballast has been developed, which is able to reduce noises and
vibrations, but overall, reduces the ballast degradation and settlement, increasing its lifespan and
reducing the maintenance needs. It is named Neoballast. It is an aggregate covered with a thin rubber
recycled layer.
This research aims for helping in its development and testing, through creating a 3D model that is able
to reproduce Neoballast behavior. However, before that, it is needed to make a deep review of
literature related with the railway transportation, focusing on the track components, loads and how
does deterioration appear.
Especial attention is paid to the ballast layer, with a detailed chapter explaining its properties as a group
of aggregates and as single particles. Ballast is the main source of settlement in the track, thus, a deeper
view of how it settles is provided.
Before introducing Neoballast and its main features, other track improvements are reviewed. Its
limitations highlight the need of further innovation, such as high-performance ballast.
Once all the state-of-art has been explained, an introduction to Finite Element Method , plasticity and
elastoplastic models is given, with the outcome of choosing one of the models to be applied on the finite
element software, Abaqus. Ballast properties are calibrated with a laboratory test, in order to obtain the
same results under the same situation. This will allow to predict the behavior of Neoballast under
different situations (e.g. different thicknesses of its layer).
Finally, the model output is analyzed with regard to the laboratory test in the terms of settlement,
stresses and stiffness.
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
TFM_AngelLorenteDomingo.pdf | 10,80Mb | Accés restringit | ||
Input files_ALD.pdf | 3,536Mb | Accés restringit | ||
TFM_ALD.zip | 727,2Kb | application/zip | Accés restringit |