NUMERICAL EXPERIMENTS FOR TUNNEL TOMOGRAPHY USING FULL WAVE INVERSION

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  • KUWAHARA Toru
    株式会社大林組 技術研究所地盤技術研究部
  • OKUZAWA Koichi
    株式会社大林組 技術研究所地盤技術研究部
  • YAMADA Nobuto
    株式会社日本地下探査 事業本部地盤調査部
  • SATO Rei
    株式会社日本地下探査 事業本部地盤調査部

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Other Title
  • フルウェーブインバージョンによるトンネルトモグラフィの数値実験

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<p> We carried out a numerical study of elastic and acoustic full-wave inversion for surface-to-tunnel seismic tomography and verified the advantage of full-wave inversion method to the conventional travel-time tomography for the geological prediction ahead of the tunnel face.</p><p> The geophysical model for tunnel ground includes complicated low velocity zones such as fault zone, aquifer zone and alternations. Seismic waves also generated by some sources on ground surface and blasting on tunnel face are received on ground surface. In the elastic full-wave inversion, we calculated the sorce function compared finite different method with spectle element metohod, and obtained accurate images both of Vp and Vs, thus information of elastic modulus distribution. While, in the acoustic full-wave inversion, we also obtained accurate images of Vp by lower performance of computer CPU.</p>

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