| 講演要旨(和文) | | ロックボルトは斜面やトンネルなどの崩落可能性が高い所に崩落の防止の為、硬い岩盤まで差し込むものです。事前捜査によりロックボルトの場所や深度が決られますが、設置の後はロックボルトの周辺の変化などを測定、又は観察する方法はあまりない。本研究ではこの問題にEM(Electromagnetic)法の適用可能性を検討する為、FDTD(Finite Difference Time Domain)法と言う数値モデリング手法によって検討した。 |
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| | 講演要旨(英文) | | Rock bolts are used to prevent collapsing in a slope and a tunnel by set up to a hard ground. The points and depths of setting rock bolts are decided by pre-surveys, but after installation, methods are seldom to check the rock bolts work well and change on ground around the rock bolts. Till now, methods through seismic, electric or electromagnetic surveys have some limit to achieve this purpose. On this study, basic research is conducted whether electromagnetic(EM) method is applicable to this objects by FDTD numerical modeling. |
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