AVAILABILITY OF THE MAGNETIC SURVEY TO INVESTIGATE THE GEOLOGY OF TUNNEL SITE IN THE GRANITE HYDOROTHERMAL ALTERATION ZONE
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- SUGIMOTO Tosihide
- 国土交通省北陸地方整備局
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- SAKAI Hideo
- 富山大学大学院理工学研究部
Bibliographic Information
- Other Title
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- 花崗岩類熱水変質地帯でのトンネルの地質調査における磁気調査の有効性
- ハナオカガンルイ ネッスイ ヘンシツ チタイ デ ノ トンネル ノ チシツ チョウサ ニ オケル ジキ チョウサ ノ ユウコウセイ
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Abstract
The air-borne magnetic surveys and rock magnetic measurement were applied to the tunnel site in the granite hydrothermal alteration zone. The results showed the strong magnetic anomaly for the igneous rocks, while the weak magnetic anomaly was found at the hydrothermal alternation zone. Further, the air-borne magnetic survey showed the correlation between the grade of magnetic anomalies and the degree and range of the hydrothermal alteration. But bedrock had been changing rapidly by hydrothermal alteration, the air-borne magnetic surveys did not follow the change. The results in this study indicate that the air-borne magnetic survey technique could be a powerful tool for the first screening survey for the tunnel.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)
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Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering) 69 (3), I_1-I_9, 2013
Japan Society of Civil Engineers