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SHM of tunnels

Monitoring in tunnels depends on the specific application. You can monitor the development of cracks, wall convergence, in mining applications you can measure strain is mine stiffeners or anchors and many other options. For one such application, we developed a special deformation sensor, which is fixed to the rock by one side and on tunnel lining the other side and by this way is possible to monitor separation of the lining from the rock, which is important especially in older tunnels to avoid the falling of the lining parts to the passing trains.