Successful field trial completed in Tournemire
Field test from June 14 to 17 with the prototype SQ 5 at the underground laboratory Tournemire of the ISRN (Institut de Radioprotection et de Sûreté Nucléaire) in France. // 3D-US Lab Team and GFZ staff of sections 2.2 and 4.2 and company Amberg Technologies AG.
A first successful field test with the newly developed seismic pulse source (SQ5) was carried out from June 14 to 17 at the underground laboratory Tournemire of the ISRN (Institut de Radioprotection et de Sûreté Nucléaire) in France. The measurements took place with the participation of 3D-US Lab partner Amberg Technologies AG and staff from GFZ Sections 2.2 and 4.2. The field test will test the operational capability and smooth functioning of the newly developed SQ 5 prototype under real underground test conditions.
Carrying out the field test with the aid of a forklift truck
The SQ5 source was mounted on a forklift truck to excite seismic waves on the tunnel wall. A total of 100 points were excited with up to 5 repetitions and recorded by 15 3-component geophone receivers. This serves to verify the time stability of the trigger and the repeatability of the excited signals. In addition, the data set is used to map the structures, in particular, of a fault zone in the vicinity of the tunnel. This zone will be hydraulically and thermally stimulated in other subsequent tests. "Basically, the usability of the prototype SQ 5 has been confirmed within the tests and we can hand over this robust product to the client" summarizes Dr. Rüdiger Giese, Head of 3D-US Lab.
Further measurements necessary for fault zone determination
Subsequently, the measurement is to be carried out again in order to document changes in the rock caused by triggering of the stimulation in the vicinity of the fault. It is intended to drill another observation well for the 3D-US Lab, which can subsequently be used for tests with the new seismic imaging probe in the clay.
