Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Echo in the mountain: Sonar technology for application in tunnel excavation

12.06.2008
Technology Transfer Award 2008 for the detection of disturbance zones during tunnel construction

Dr. Rüdiger Giese from the GeoForschungsZentrum Potsdam (GFZ) and his team receive the "Technology Transfer Award 2008” from the Technology Foundation Brandenburg for the development of a new system for use in tunnel pre-exploration, the ISIS.

The ISIS (Integrated Seismic Imaging System ISIS) is a method which enables the preliminary exploration of the rock mass in a tunnel. The technical innovation here in lies particularly in the fact that with this procedure sounding-explosions are no longer necessary and the system can be employed while actual tunnel construction work is running. Herewith tunnel excavation will be safer, faster and more efficient.

In spite of all progress to date, tunnel construction is still a technical and economical risky undertaking. The biggest imponderability is that an exact pre-exploration of the rock mass in which the tunnel drilling machine has to drill is essential. To investigate the rock material in front of the tunnel drilling machine seismic procedures are usually applied: a small explosive charge is ignited and the propagation of the explosion’s sonic waves are evaluated. For this purpose the tunnel drilling machine has to stop operation and construction work is interrupted. – with costs of around 100 Mio. Euro for such a machine, a significant cost factor.

And this is where the ISIS comes to use. The ISIS allows for the forecasting of the geological characteristics of the rock mass in the surroundings of tunnel excavation in advance and without disturbing drilling procedures to any great extent – similar to ultrasound in medicine.

“The idea is to use the tunnel-anchor, to install a measuring system for seismic three-component receivers with their antenna in such a way that a high-resolution seismic image of the rock mass during excavation is possible” says Dr. Rüdiger Giese. “Small earth-microphones (geophones) serve as receivers, which are implanted in the pinnacles of the rock anchor. Herewith the different seismic waves can be supersensitively compiled. The data gives information on changes in the rock mass and eventually on water-bearing stratum”.

The anchors are cemented in meter-deep boreholes. They can be fixed radial to the tunnel or in the direction of tunnelling. The seismic impulses are triggered with a pneumatic hammer or an electromagnetic vibration source, whereby the impulses radiate in the specified direction and can be repeated in intervals of seconds.

And all this can take place during the ongoing tunnelling procedure.

The system has already been applied during the construction of the new St. Gotthard tunnel and in the tunnelling of Nessy’s home, Lough Ness.

“We are pleased that we could obtain Herrenknecht AG, the global market leader in tunnel excavation as our partner for the market launch of the ISIS System. This is thanks to the excellent work of Herr Giese’s team. I heartily congratulate Dr. Giese on receiving this award”, says Professor Dr. Reinhard Hüttl, Scientific Executive Director of the GFZ Potsdam on this occasion.

Franz Ossing | alfa
Further information:
http://www.gfz-potsdam.de/news/foto/ISIS/welcome.html

More articles from Earth Sciences:

nachricht Time To Say Goodbye: The MOSAiC floe’s days are numbered
31.07.2020 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

nachricht Alaskan seismometers record the northern lights
30.07.2020 | Seismological Society of America

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: AI & single-cell genomics

New software predicts cell fate

Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...

Im Focus: TU Graz Researchers synthesize nanoparticles tailored for special applications

“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.

Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...

Im Focus: Tailored light inspired by nature

An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.

Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...

Im Focus: NYUAD astrophysicist investigates the possibility of life below the surface of Mars

  • A rover expected to explore below the surface of Mars in 2022 has the potential to provide more insights
  • The findings published in Scientific Reports, Springer Nature suggests the presence of traces of water on Mars, raising the question of the possibility of a life-supporting environment

Although no life has been detected on the Martian surface, a new study from astrophysicist and research scientist at the Center for Space Science at NYU Abu...

Im Focus: Manipulating non-magnetic atoms in a chromium halide enables tuning of magnetic properties

New approach creates synthetic layered magnets with unprecedented level of control over their magnetic properties

The magnetic properties of a chromium halide can be tuned by manipulating the non-magnetic atoms in the material, a team, led by Boston College researchers,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“Conference on Laser Polishing – LaP 2020”: The final touches for surfaces

23.07.2020 | Event News

Conference radar for cybersecurity

21.07.2020 | Event News

Contact Tracing Apps against COVID-19: German National Academy Leopoldina hosts international virtual panel discussion

07.07.2020 | Event News

 
Latest News

First radio detection of an extrasolar planetary system around a main-sequence star

04.08.2020 | Physics and Astronomy

The art of making tiny holes

04.08.2020 | Physics and Astronomy

Early Mars was covered in ice sheets, not flowing rivers

04.08.2020 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>