A Preliminary Comparison Study On Consolidated-Drained Triaxial Tests According to BS And DIN

Spagnoli, Giovanni (Fugro Consult GmbH) | Hotz, Christian (Fugro Consult GmbH) | Ginda, Marek (Fugro Engineering Services Limited)

OnePetro 

This is the case when the client and / or the geotechnical consultant are not from German speaking countries. The BSH (Bundesamt für Seeschifffahrt und Hydrographie) is the Federal Maritime and Hydrographic Agency responsible for studying, evaluating and, subsequently, accepting or rejecting the authorization to build offshore wind farms in German territorial waters. This procedure is based on the geotechnical laboratory reports presented to this agency. However, since the DIN are German standards, this authority accepts laboratory data based only on the German standards and, in the case of triaxial tests, explicitly according to DIN 18137 (BSH 2008). Sometimes it is not possible to perform triaxial tests for geotechnical characterization of the sea bed sediments according to German standards, because of the diameter, the kind of H:D ratio, etc. Up to now, no real evaluations and comparisons have been carried out between DIN (2008) and BS (1989) regarding triaxial tests. Therefore, we show a preliminary study based on consolidated-drained triaxial tests performed according to DIN and BS on real marine sediments and on standard quartz sand. Although one could have anticipated the obtained results, as rate effects are usually understood to be insignificant in granular materials due to the complicated conditions and interpretations of the triaxial tests and, in order to carefully review the results, only consolidated-drained conditions were investigated. Moreover, although there are many studies that evaluated the effect of different sample preparation methods, none of them actually takes into account a systematic comparison of the international standards.