A geosynthetic overbridging system in the base of a railway embankment located on an area prone to subsidence at groebers: Construction experience

摘要

High strength geosynthetic reinforcements offer an economical possibility to reduce the foundation risk in areas prone to subsidence. Currently constructed railway junction Groebers extending over an area of 120 m x 800 m is the first place, where German Railways are using geogrids to overbridge sinkholes. Two of the eight tracks are designed for the speed of up to 300 km/h. The overbridging system with a design life of 60 years guarantees for the serviceability of the railway tracks during a load time of 1 month after the development of a sinkhole. It consists of: a warning layer, two geogrid layers and a cement stabilized bearing layer. Planning and specification are based on the results of a full scale test and FEM calculations. The final requirements, a typical sections, a specially developed installation-device and first experience are presented in the paper.