Frequency domain full waveform inversion with small‐scale laboratory measurements for reconnaissance in mechanized tunneling

In mechanized tunneling, so-called tunnel boring machines (TBMs) drill through the ground in an automatized manner. Therefore, drilling process is very efficient but maintenance costs are high. Seismic exploration seems appropriate to identify changing conditions front of TBM reduce from damages and corresponding dwell times. Today's seismic techniques using only a small amount information, which contained records field observations, whereas full waveform inversion (FWI) tries use whole content. The potential different FWI approaches for application tunneling has been investigated. An analysis performance not employing synthetic examples additionally measured waveforms essential. Since surveys at construction side performed with mind, data sets usually testing developed algorithms. Nevertheless, validation by possible recordings small-scale experimental setup. A super high strength grout specimen constructed validating adjoint frequency domain approach. Frequency models compute response system infinite time interval. attenuation material as well effects free surfaces hard quantify over designed way that four six borders can be modeled absorbing boundaries. For this purpose, displacement truncated just before waves reflected excluded arrive measurement points. This design combination notch representing rectangular makes measurements more similar side. hole embedded acts discontinuity, approach aiming detect.