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Study on characterization of colloidal silica grout for rock excavation under saline groundwater

塩水系地下水におけるコロイダルシリカグラウトの特性に関する研究

辻 正邦*; 中島 均*; 齋藤 亮*; 沖原 光信*; 佐藤 稔紀

Tsuji, Masakuni*; Nakashima, Hitoshi*; Saito, Akira*; Okihara, Mitsunobu*; Sato, Toshinori

活性シリカコロイドの溶液型グラウトは浸透性や耐久性に優れており、放射性廃棄物の地層処分における坑道掘削時の湧水抑制対策技術への適用が期待されている。近年日本においては、処分場が沿岸域に計画される可能性も検討されているため、海水条件下での使用を想定した溶液型グラウトの適洋性の確認や特性データの整備を進めている。本報では、海水系地下水へグラウトを注水する場合に適する新たな溶液型グラウトについて、配合調整条件を明らかにするとともに、このような海水対応グラウトの基本配合の試験体を作製し、力学的安定性や浸透注水性などの基本的な特性を取得した結果を報告する。

A rock excavation grouting technology has been recently studied as significant technology for reducing the ingress of water into the deep repository. However, it has not been studied for applying to the coastal region, where it is discussed to be a more suitable region for the geological disposal in Japan. The latest material called colloidal silica grout (CSG) is good for sealing narrow fractures but is known to be sensitive to the salinity of groundwater because of its gelling property with salt accelerator. Although the gelling of CSG can be controlled by adding an acidic pH adjuster, the methodology for delivering the appropriate grout is not well established for such conditions of saline groundwater. Therefore, this research project was established to enhance the existing rock grouting technology for deep repositories.

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