Praktische Anwendung injizierter Isolierkörper als Erschütterungsreduktionsmaßnahme

The recent increase in rail traffic over the last years has led to an equally increasing demand of vibration isolation measures. Foam bodies, arranged in the transmission area between the railway track and the object to be protected, can be installed economically and subsequently and have been subject of research in the past decade. A previous research project conducted at the chair of Geotechnical Engineering of RWTH Aachen found Polyurethan (PU) foam to be an ideal material for these foam bodies, due to its low density. In this thesis, an installation technique for a vibration isolation measure, which is arranged in this transmission area and consists of PU foam, has been developed. In this context the proof of its reproducibility as well as its efficiency have been provided. Technical and geometrical requirements have been formulated, demanding a simple installation procedure and a homogenous foam body that is of low density and installed as deep as possible. An installation technique has been developed where an opening is excavated in the ground first and subsequently filled by injected PU foam. The resulting homogenous foam body is of very low density and can be built down to a maximum depth of 3.2 m. With the objective of keeping a simple installation procedure, the depth of the foam body, and therefore its efficiency were limited. The reproducibility and the efficiency of the measure have been demonstrated in a field test. Besides, a numerical model has been developed and used for investigation of different effects on the efficiency of the measure, such as geometry or soil conditions. Based on the experiences of the field tests and the results of a parametric study carried out on the numerical model a guideline has been developed, which can serve as a planning tool for future projects. The practical application of the measure showed that, despite the successful installation of the foam body, the efficiency of this measure could be proven just partially. To further increase its impact on vibrations, the ...