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Szukana fraza: [Abstrakt = "In bridge structures, usually built in difficult ground and water conditions, proper and careful recognition of the ground layout seems to be a key element in the design of foundations. Substrate tests carried out at the stage of road investment preparation should only be considered as exploratory research, which should be the starting material for the appropriate study, the sites of which should be planned strictly in the locations of the supports. In case of any discrepancies in the preliminary calculations of foundations, further supplementary geotechnical research may be required. This article presents an example of a bridge structure located in a dual carriageway, where incorrect ground recognition resulted in large unequal subsidence of some supports of structure that was erected first. The article shows the subsidence of the supports and their effects \(eg. in the form of damage to the bearings\) that arose several years after the completion of the structure erected at the first stage, but during construction of the second structure. Finally, some guidelines will be provided in order to secure other two\-stage constructed bridges against unfavorable subsidence of supports similar to those described in this article."]

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