Identification and Countermeasure of Tunnel Excavation Muck Leaching Heavy Metal-Yukisawa-Daini-Tunnel, in Nihonkai-Engan Tohoku Expressway from Oodate to Kosaka Section-

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  • 自然的原因により重金属等を溶出するトンネル掘削土判定と処理―日本海沿岸東北自動車道大館～小坂雪沢第二トンネル―
  • シゼンテキ ゲンイン ニ ヨリ ジュウキンゾク トウ オ ヨウシュツ スル トンネル クッサクド ハンテイ ト ショリ ニホンカイ エンガン トウホク ジドウシャドウ オオダテ コサカ ユキ サワ ダイ2 トンネル
  • Yukisawa-Daini-Tunnel, in Nihonkai-Engan Tohoku Expressway from Oodate to Kosaka Section
  • 日本海沿岸東北自動車道 大館～小坂 雪沢第二トンネル

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This paper presents the excavated muck identification method used for the Yukisawa Daini Tunnel, applying threshold of 1) pH attained through batch leaching test, 2) ignition loss, 3) bulk rock sulfur contents and 4) Sulfur/Calcium molar ratio. It also introduces deposal method of excavated muck.<BR>The section between Ohdate and Kosaka interchanges of the Nihonkai-Engan Tohoku Expressway in Akita Prefecture is currently under construction. Through the initial survey of Yukisawa Daini Tunnel, leached selenium was detected from the excavation site, and exceeded the limit regulated under the Soil Contamination Countermeasures Law. As the conventional identification method for the excavated muck contamination requires much time, faster simplified method should be identified.

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