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Erschienen in:
2018 | OriginalPaper | Buchkapitel
Analysis of Cofferdam Stability for Foundation of a Bridge Pillar
verfasst von : Monika Sulovska, Jakub Stacho
Erschienen in: Proceedings of China-Europe Conference on Geotechnical Engineering
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Abstract
Temporary cofferdams for foundations of bridge pillars are ranked among the demanding constructions, and they often require high resources for their construction. The newly planned bridge over the Danube River in the Komarno city between Slovakia and Hungary has been designed as an asymmetric cable-stayed bridge with single pillar. The cofferdam made of double – row sheet pile wall of ground plan dimensions of 20 × 44 m is designed for foundation of the pillar. A narrow space between sheet piles will be filled by an atypical concrete.
The paper focuses on stability analysis of the cofferdam, which construction differs to typically proposed constructions of excavation pits for founding of the bridge pillars. It was necessary to verify stability of the cofferdam in several design situations, such as construction process of the cofferdam, injection of the subsoil from the cofferdam, which is backfilled by the soil and the process of excavating the pit in several phases with gradual installation of struts. The task was solved using an analytical method and numerical method – FEM. Modeling the behavior of the construction of the cofferdam using different methods allowed wide analysis of results and more reliable verification of the stability of the construction as well as the design of individual elements.