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Title: アルカリ性トンネル排水の性状と自然浄化作用による中和過程
Other Titles: Properties of Alkaline Groundwater Seepage from a Tunnel and Its Neutralization Process by Self-Purification Mechanisms
Authors: 青木, 卓也1 Browse this author
五十嵐, 敏文2 Browse this author →KAKEN DB
飯尾, 佳浩3 Browse this author
Authors(alt): Aoki, Takuya1
Igarashi, Toshifumi2
Iio, Yoshihiro3
Keywords: alkaline tunnel seepage
geochemical calculation
dissolution of atmospheric carbon dioxide
Issue Date: 10-Dec-2009
Publisher: 日本応用地質学会
Journal Title: 応用地質
Volume: 50
Issue: 5
Start Page: 273
End Page: 279
Abstract: トンネル建設後もトンネル湧水がアルカリ性を呈する地点において,そのアルカリ性の原因を究明するために調査ボーリングコアを用いた溶出試験を行うとともに,現地水質調査および地球化学解析によって自然環境を活用した合理的な中和方法を考察した.その結果,アルカリ性の主な原因が,トンネル掘削区間に分布する頁岩や砂岩などに介在する方解石の溶解という自然的原因であることがわかった.さらに,希釈水となる周辺沢水の流量が少ない場合,沢水との混合だけではトンネル排水のpHは十分に低減できないこともわかった.しかし,PHREEQEによる解析によって,大気中の二酸化炭素の溶解を促進させることにより,中和することが可能であることが示唆された.このことから,中和処理装置を設けることなく,自然の浄化作用を活用するアルカリ性地下水の影響を低減する対策の可能性が示された.ただし,大気中二酸化炭素の溶解を促進するために,現地地形を踏まえ,二酸化炭素と地下水との接触にかかわる時間や面積の影響を調査する必要がある.
Groundwater seepage from a tunnel has been alkaline since it was excavated. Leaching experiments with boring core samples around the tunnel and analysis of the groundwater seepage and surrounding river water were conducted to understand the cause of alkaline water and neutralization processes. In addition, geochemical processes were evaluated by using PHREEQE. The analytical, experimental and calculation results showed that the alkaline groundwater was primarily caused by the dissolution of calcite contained in the shale and sandstone distributed around the tunnel, and that mixing of the alkaline groundwater with the river water had an insignificant effect on the pH reduction during the dry season. The geochemical calculation suggests that the dissolution of atmospheric carbon dioxide effectively reduces the pH of alkaline seepage from the tunnel. This indicates that the effect of alkaline water can be mitigated by utilizing natural processes. However, it is necessary to quantify the dissolution of atmospheric carbon dioxide into the alkaline seepage.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 五十嵐 敏文

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