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Interpretation of dynamic measurement

Published: 7 June 2019

The project aims to study how frequency data used to detect defects in tracks and ballast can also be used to describe the embankments properties for larger sections.

The development in society means that infrastructure like ballasted railway systems are facing challenges due to request for increased number of high-speed trains and heavier freight trains. This implies that ballasted railways get an increased impact from larger dynamic loads. The question is how the ballasted railways are today affected by dynamic loading and how will an increase in train speed and weight change the soil behaviour within the railway embankment.

A method of investigating soil behaviour is via geophysical measurements. Accelerometers are commonly used for vibration measurements and by installing them on trains measurements are possible to perform for complete railway sections. The knowledge of Eigen frequencies for various track components and soil layers are essential when considering frequency analysis of accelerometer measurements. Specifically, this means that the analysis is about detecting resonance of different components. Thus, the impact of train induced vibrations on various soil layers can be detected as well as a soil profile of the railway embankment is possible to obtain with means of a back calculation approach.