Working Group „Parameteridentification“

The working group aims to formulate recommendations for performing geotechnical analysis in practice, including the selection of an appropriate calculation method, the definition of geotechnical parameters and the determination of values for the analysis. The guideline should help engineers involved in practical geotechnical analysis to choose the most appropriate calculation method. Emphasis will be put on the selection of suitable constitutive models for different types of applications, e.g. foundations, deep excavations.  

The main content of the recommendation is structured as follows:

Choice of calculation method and constitutive model Choice of soil investigation programme for parameter determination (in-situ and laboratory) Derivation of input parameters for analysis based on experimental data

Members:

Markus Brandtner                            IGT - Salzburg

Florian Scharinger                           GDP ZT - Graz

Erich Saurer                                      Skava Consulting ZT-GmbH - Salzburg

Ansgar Kirsch                                   FH Aachen - Deutschland

Franz Tschuchnigg                          TU Graz – Graz

Contact: franz.tschuchnigg@TUGraz.at

Working Group „In-situ Soundings“

Salzburg, Zell am See, Klagenfurt and Bregenz are areas in Austria with poor ground conditions (mainly clayey, sandy silts) but are important from a touristic and real estate perspective. Sampling in this type of soils is almost impossible leading to material parameter, necessary for the detailed design of geotechnical structures, which do not represent in-situ conditions very well. This may lead to damage of structures in the long term or to uneconomical counter measures, depending whether the misinterpretation of data is on the favourable or unfavourable side respectively. In-situ site testing by means of CPTu or seismic DMT provide a time and cost efficient alternative to characterise in-situ ground conditions. However, available correlations to arrive at material parameters based on in-situ measurements do not lead to satisfying results for these intermediate soils. Pore water pressure distributions during penetration and the influence of possible structure and bonding on cone resistance are not well understood and are therefore topic of intensive research activities. It is the goal of the working group to formulate recommendations for an improved determination of soil parameters for silty soils based on CPTu and sDMT taking into account aforementioned effects.       

Members:

Marte Roman (TU Graz, Institut für Bodenmechanik, Grundbau und Numerische Geotechnik)

Moser Martin (Bautechnische Versuchs- und Forschungsanstalt Salzburg)

Oberhollenzer Simon (TU Graz, Institut für Bodenmechanik, Grundbau und Numerische Geotechnik)

Premstaller Michael (Premstaller Geotechnik ZT GmbH)

Racansky Vaclav (Keller Grundbau GmbH)

Saurer Erich (SKAVA consulting ZT GmbH)

Schuller Hartmut (INSITU Geotechnik ZT GmbH)

Stauder Stefan (TU Graz, Institut für Felsmechanik und Tunnelbau)

Tschuchnigg Franz (TU Graz, Institut für Bodenmechanik, Grundbau und Numerische Geotechnik)

Wiltafsky Christoph (GDP ZT GmbH)  

Note: 5 additional members of the FFG-Research Project PITS (Parameteridentification by means of in-situ testing in silty soils) will be nominated until summer 2021.

Contact: s.oberhollenzer@tugraz.at