Unstable rock, groundwater inflow and other unforeseen ground conditions is a risk factor not seldom causing delays and large extra costs in underground infrastructure projects. In order to handle such risks better knowledge about the soil-, rock- and groundwater conditions, soil contaminants and unknown underground constructions is needed.
Preinvestigations prior to large underground infrastructure projects are most often based on drillings. Drillings produce detailed information in single boreholes but no information between those. However, modern geophysical methods can map the underground in 3D in a time and cost efficient way also between boreholes. Lately especially combined use of the two methods resistivity and time domain induced polarization (DCIP) have shown great potential for underground infrastructure preinvestigations. However urban environment is a great challenge due to urban noise and therefore the DCIP technique needs to be further studied and developed.
This project aims to adapt and configure the DCIP technique for use in urban areas, by develop: data collection methodology, instrument (hardware), data processing, inversion technique and understanding of the relation between geophysical and geotechnical and environmental properties.
Detailed project planning and strategies for handling of risks will ensure the success of the project and the spreading of the results achieved.
• Developing technique for handling of urban noise and obstacles
• Develop methodology for 3D surveys in urban area
• Improve knowledge on how to interpret contaminated soils from geoelectrical methods
• Improve detailed interpretation of geological features
To improve the potential for geophysical methods to interpret ground conditions with respect to geology, groundwater, structures and pollution in urban environment, in order to achieve more cost effective construction of infrastructure.
Torleif Dahlin - contact
Professor, Engineering Geology, Lund University
PhD, Geology Dept., Lund University
Lic.Eng., Engineering Geology, Lund University
Lic. Eng., Engineering Geology, Lund University / Tyréns AB
Post doc, Engineering Geology, Lund University
PhD, Geology Dept., Lund University / Tyréns AB
PhD, Tyréns AB
PhD, Tyréns AB
Professor, Dept of Geoscience, Aarhus University
Assistant Professor, Dept of Geoscience, Aarhus University
PhD, Swedish Geological Survey
Developer, ABEM Instrument AB / Guideline Geo AB
• Adaption of DCIP imaging. Development and adaptation of DCIP imaging for use in urban environments; adaptation of data acquisition strategies and methodology and data processing.
• Prototype instruments. Developing prototype DCIP equipment for time and cost efficient acquisition of data for description of the subsurface in three dimensions (3D).
• 3D inversion of DCIP. Development of algorithms for 3D inversion of DCIP data. The software will build on the novel algorithms for 1D and 2D inversion by Fiandaca et al (2012).
• Engineering and environmental properties. Investigation of possible correlations between geophysical and engineering/environmental key parameters, e.g. soil conditions, tectonic structures, waste as well as water and contaminant occurrence and transport.
• Integration in TRUST. Integration of all the TRUST sub-projects, for building up a holistic survey method, together with model and data visualisation for a smart underground construction.
• Dissemination. Dissemination of the results to authorities, industry and academy.
Per Tengborg, BeFo
Robert Sturk, Skanska
Andreas Pfaffhuber, NGI
Malin Norin, NCC
Christel Karlsson, SGI
Lena Persson, SGU
Johanna Gottlander, TRV
Roger Wisén, Rambøll A/S
Professor, Hydrogeophysics, Rutgers University, New Jersey, USA
Professor, Hydrogeophysics, Lancaster University, UK
Professor, Geotechnical Engineering, University of Southampton, UK