既設タンク地盤の液状化対策として, 浸透性のよい薬液 (特殊シリカ系水ガラス) を用いた注入固化工法の実用化に向けた研究が進められている. 本研究では, 薬液注入固化工法の効果を解明するために, 有効応力液状化解析を行った. 解析結果と動的遠心実験の結果 (加速度, 間隙水圧, 表面沈下量) はほぼ一致することが明らかになった. また, 解析結果より薬液注入固化工法の地震時の地盤沈下を低減できるメカニズムを解明した. すなわち, 注入固化体自体の地震時の沈下が小さいため, タンク直下の薬液注入固化の深度が大きいほど, 薬液注入固化された地盤の地震時の沈下量が小さくなる.

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It has been reported that liquid jet occurs by the irradiation of Ho: YAG laser within tubular structure following formation of laser-induced bubble. We evaluated the characteristics of this laser-induced liquid jet using high speed camera and needle hydrophone. The evaluation by high speed camera indicated that the strength of the jet can be controlled by the laser energy, structure of the nozzle, and stand off distance between optical fiber end and tip of the nozzle. The irradiation of laser-induced liquid jet into the gelatin model and pig liver have resulted in sharp dissection of the tissue, but reserving blood vessels. We consider it has potentials to apply to surgical instrument for cutting tissue, but further examination including evaluation of amount of destruction to surrounding tissue are required.

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