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The University of Southampton

Research project: The influence of existing buildings on ground-borne vibration from railways

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This project aims to improve the prediction of ground-borne vibration from railways by including the influence of existing buildings.

The prediction of ground vibration and railway induced vibration in buildings is a complicated problem. It can be divided into three parts:

First, the simulation of the source. This includes the train and the track which are excited by the wheel and rail roughness. This part forms the input excitation for the whole prediction model.

Second, the free-field ground response due to a running train. This part is based on the Green’s functions representing wave propagation in the ground. It is usual to consider an infinite elastic homogeneous layered ground to simulate the soil.

Third, the receiver (building). In this part, the dynamic soil-structure interaction (SSI) is usually considered, to simulate the coupling loss, that is the reduction in vibration at the interface due to the presence of the building. When considering the dynamic SSI, the building response will be closer to reality. At the same time, if SSI is considered when calculating the ground vibration, this can improve the accuracy of the vibration of the ground itself.

In a complex urban environment, the presence of multiple buildings can have a significant effect on the vibration field, causing reflections, shielding or amplification. The project is investigating these effects for different buildings and foundations.

Associated research themes

Railway noise and vibration

Related research groups

Dynamics Group
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