| 講演要旨(和文) | | 串木野国家石油備蓄基地では，1994年より岩盤タンクと呼ばれる大規模地下空洞に原油を貯蔵している．2003年に同基地の空洞の力学的安定性を監視する目的で高精度傾斜計が導入された．高精度傾斜計は地球潮汐，気圧変動，地震および操業に対する応答など，極めて微小な傾斜変化も検知できるものである．本論では，気圧変動による地下空洞周辺岩盤の微小傾斜変動の計測結果を示し，加えて，それによる空洞の力学的安定性評価について議論する． |
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| | 講演要旨(英文) | | At the Kushikino National Petroleum Stockpile Base, crude oil has been stored in a large underground cavern since 1994. In 2003 a high precision tiltmeter system was installed in the ground to monitor the mechanical stability of the cavern. High precision tiltmeters are also capable of detecting extremely small tilt changes due to earth tide, atmospheric pressure change, earthquakes and operations. In this paper, we show the monitoring results of the microtilt changes around the cavern due to atmospheric pressure fluctuation, and discuss the mechanical stability of the cavern. |
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