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BEAM®
– Introduction BEAM is a non-intrusive focused-electrical induced polarisation ground prediction technique, permanently operating while TBM tunnelling.
Main components of the survey system are the measuring unit placed in the TBM operator cabin and special adapted excavation tools which are used as electrodes. The unit is connected to the guidance system and receives the boring signal which allows fully automatic data acquisition and visualisation in real-time on an integrated monitor. Communication facilities transfer the forecast results to every accredited computer world wide simultaneously.
Based on the measuring data the percentage frequency effect PFE and the resistivity R, an advanced evaluation software is established for geoelectrical-geological/ hydrogeological classification and interpretation.
Since 2000 the geophysical probing system is fulfilling the practical demands under the rough and various conditions of TBM tunnelling work by indicating reliable results in hard rock as well as in soft ground.
Early warning information of significant ground changes while tunnelling is advantageous to reduce hazardous risks, in particular during excavation with tunnel boring machines. Accidents or complications and hence expensive standstills can be prevented by planning precautionary and logistical measures.
On the condition that TBM operations and lining works should not be obstructed by data acquisition, a probing and documentation without predrillings is one major demand. On the other hand knowledge of non-critical ground conditions ahead of the face allows rapid excavation resulting in high production rates and contributes to shield staff and equipment.
The Bore-Tunnelling Electrical Ahead Monitoring - BEAM -, developed and patented by Kaus et. al., managing director of GET, is a geophysical ground prediction technique especially designed for the underground construction industry. Supplied on a rental basis by GET, it is increasingly ordered since the year 2000 to serve at international TBM projects with a total tunnel prediction length of more than 100km.
Beside the standard TBM operations, special applications has been performed for drill & blast drives and also perimeter investigations for cavity detection in karst formation around existing tunnels. |
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1D or 3D forecast results in real-time |
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