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In Almelo, the Netherlands, a construction of concrete floors and diaphragm walls is built to bring the present railway below surface. During construction the trains use a temporary railway track that is close to the building activities. For the construction of diaphragm walls trenches are made in the underground near the temporary railway line. The stability of the trenches is secured by bentonite slurry. In this situation trains are passing at a distance of a few meters. The stability of the slurry trenches has been analyzed with the method described in DIN 4126. This code however does not specify how dynamic actions from passing trains are to be taken into account. Passing of trains causes excess pore pressures and accelerations in the underground. These pore pressures and accelerations have a negative influence on the stability of the trench. The influence has been calculated with Finite Element Method.
The pore pressures and accelerations in the subsoil below and beside the railway were measured during two days and the passing of many trains. The measurements clearly show the passing of trains. The stability of the trench during passing of trains has been analyzed with the results of the measurements.
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