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高精度弾性波測定システムを利用した地下水流動変化の原位置計測

In-situ measurement using of high resolution elastic wave velocity measurement system to understand a groundwater flow in rock mass

松井 裕哉 ; 石山 宏二*; 吉野 修*; 引間 亮一*; 佐ノ木 哲*; 林 邦彦*; 高橋 昌弘*; 里 優*

Matsui, Hiroya; Ishiyama, Koji*; Yoshino, Osamu*; Hikima, Ryoichi*; Sanoki, Satoru*; Hayashi, Kunihiko*; Takahashi, Masahiro*; Sato, Masaru*

本研究は、地下水流動状況変化の把握に対する高精度弾性波速度測定の適用性を検討するため、西松建設と原子力機構との共同研究として実施したものである。高精度弾性波速度計測は、瑞浪超深地層研究所における再冠水試験場所の近傍で実施し、再冠水試験坑道からの全排水開始時から約3ヶ月間実施した。計測の結果、地下水流動場の変化に伴う弾性波速度の変化が認められ、高精度弾性波測定が地下水流動場の変化の把握に適用できる見通しが得られた。

This paper is described about the results of collaboration study between Nishimatsu cop. and JAEA to estimate the applicability of high resolution elastic wave velocity measurement for understanding of a groundwater flow. The measurement was carried out in the vicinity of the groundwater recovery test drift in MIU and it continued for about three month from just after starting at the drainage of the test drift. The results suggested that the elastic wave velocity change were measured with groundwater flow due to drainage of the test drift and the high resolution elastic wave velocity measurement can be applicable for understanding of groundwater flow.

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