Abstract
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.
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.
