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高圧湧水下におけるプレグラウチングとポストグラウチングを併用した湧水抑制効果の評価

Evaluation of combined pre- and post-excavation grouting for reducing water inflow under high water pressure condition

見掛 信一郎; 池田 幸喜; 松井 裕哉; 辻 正邦*; 西垣 誠*

Mikake, Shinichiro; Ikeda, Koki; Matsui, Hiroya; Tsuji, Masakuni*; Nishigaki, Makoto*

瑞浪超深地層研究所の研究坑道掘削では、湧水抑制対策の観点でプレグラウチングを実施した。深度500m水平坑道の掘削完了後、高圧湧水下(最大4MPa)でプレグラウチングの実施範囲に対してポストグラウチングを併用した。ポストグラウチングの注入範囲はプレグラウチングの外側とし、溶液型材料、複合動的注入工法を適用した。その湧水抑制効果は、グラウチングを実施しない場合に対して湧水量を約100分の1まで低減できた。これらの結果から、プレグラウチングとポストグラウチングを併用した湧水抑制対策は高圧湧水下で適用でき、湧水抑制効果が高いことを提示できた。また、グラウチングによる透水性の低下割合と注入範囲の関係について理論に基づく評価を行い、その手法は簡便であり設計や湧水量予測において有用性が高いことを示した。

Pre-grouting of shafts and galleries had been conducted during the construction of MIU in the aspect of reducing water inflow. After excavating GL.-500m gallery, a post-grouting was performed on section of the pre-excavation grouting area under high water pressure condition (max: 4MPa). The post-grouting experiment was performed outside of the pre-grouting zone with designs, applying colloidal silica grouting material and complex dynamic grouting. It was estimated that the inflow after post-grouting was reduced by 1/100 of the case that pre- and post-grouting were not performed. These results indicate that the applied combined pre- and post-grouting methodology is effective in reducing water inflow and it can be applicable under high water pressure condition. Then, this paper states the theoretical evaluation of relationship between reduction of hydraulic conductivity and the grouting zone is very convenient and useful for grouting design and estimate of water inflow.

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