Realization of a railway enlargement in unstable excavations alongside the existing line at Dilbeek (Belgium)

摘要

Within the framework of the regional express network around Brussels, two new railway tracks will be added besides two existing tracks linking Brussels to Ghent. The existing railway link crosses a valley with a geotechnical complex lithography. This complexity and the existing slopes beside the railway link up to 20m deep, had an in important influence on the design of the railway enlargement. Based on historical information and the detailed soil investigation the design is done with respect for the existing soil improvement measures taken in the past and the scope of the project. The design includes slope stability measures such as soil nailing, tieback anchors, construction elements with a secant pile wall and hydraulic measures to avoid water overpressure on the construction. The design of the construction will be discussed in detail as well as the first monitoring results of the movements and the anchor forces of the construction during execution.