海底トンネル施工時の異常出水の予知についての一例

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概要

• 論文の詳細を見る

• The construction of an undersea tunnel below the Tsugaru Strait between Honshu and Hokkaido Islands in Japan through incipiently metamorphosed Miocene andesitic rocks have provided a remarkable opportunity to study the geochemical method to predict the gushing out of seawater into undersea tunnel, through fissures in zeolite facies metamorphosed rock mass from boundless overlying sea. Close relathioship between discharge rate and K (and Ca) content the seepage waters was found. K and Ca contents of the seepage waters generally increase and decrease respectively with the increase of discharging rate. The K content of seawaters, after extensively interacted with rocks, became extremely low when the discharge rate is lower than hundred liter per minite. The Cl content of the seepage water can be used to indicate the mixing ratio of seawater/meteoric water. Therefore, K×Cl value is proposed to be the most important chemical parameter which clearly reflects physical properties of waters such as migration velocity of waters within the Miocene rock mass, water/ rock ratio, water pressure and discharge rate. The variation of K and Cl contents of seepage waters from pilot bore holes and faces of tunnles provided critical informations on how rapidly fluids are penetrating the rocks between the undersea tunnel and sea floor, permitting necessary precautionary measures to be taken to avoid disastrous entry of seawater.

• 一般社団法人日本応用地質学会の論文
• 1981-03-30

著者

• 関 陽太郎

  埼玉大学工学部

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