Abstract
Case study was carried out into the causes and countermeasures against excessively deformed concrete culverts during and immediately after the construction in the embankment. Two cases dealing with the issue of typical backwards problem in geotechnical engineering were examined. In this paper, first of all, the outline of the damaged culvert as well as the surrounding embankment is in detail described. The background, together with the cause of damage, is discussed based on the results of site investigation. Secondly, it was attempted to elucidate the deformation mechanism of the embankment by means of numerical analysis, and the countermeasures are proposed. Finally, the stability of the embankment with the countermeasures was evaluated.
