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  Early Information of Ground Conditions with SSP -E in TBM Tunnelling

  In order to monitor the ground conditions ahead of a TBM while tunnelling, there is a need for systems that are co-working smoothly with the TBM. Sonic Softground Probing for Earth Pressure Balance Shield machines (SSP-E) is capable of early detecting obstacles relevant for TBM tunnelling and thus enables responsible persons on construction sites to react in a timely and plannable manner to optimize the TBM advance. The system uses the method of reflexion seismics and shows a high degree of automation and integration into the TBM's tunnelling procedure. As a supplementary system the Disc Cutter Load Monitoring (DCLM) displays an in-situ measurement of the load on the excavation tools installed in the cutting wheel. The results of both methods can be combined to verify and delimit the detected events to help the TBM operator to coordinate and reduce probe drilling ahead of the TBM and to improve TBM operation with regard to the expected geology.

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