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Journal Articles

Pre-excavation grouting in construction of Mizunami Underground Research Laboratory

Hara, Masato; Kinoshita, Harunobu; Ikeda, Koki; Yamamoto, Masaru; Nobuto, Jun*

Tonneru Kogaku Hokokushu (CD-ROM), 18, p.23 - 30, 2008/11

In the excavation for the ventilation shaft of the Mizunami Underground Research Laboratory, pre-excavation grouting with ordinary Portland cement is conducted to reduce the water inflow. The target value for the hydraulic conductivity of grouted zone is set to be 2 Lugion, considering mainly the capacity of water treatment facility. In this paper, the grouting work conducted up to the depth of GL. -220m is summarized. By reviewing the water inflow and hardened cement injected into rock fractures observed at shaft wall, the validity of grouting method so far is evaluated.

Oral presentation

Pre-grouting to reduce water inflow in the ventilation shaft into the Mizunami Underground Research Laboratory

Hara, Masato; Kinoshita, Harunobu; Ikeda, Koki; Yamamoto, Masaru; Yahagi, Ryoji*; Kikuchi, Shinji*; Kawano, Hiromichi*; Ushida, Kazuhito*; Nobuto, Jun*; Minamide, Masashi*

no journal, , 

At the Mizunami Underground Research Laboratory, inflow water control to inside the tunnel has become topic. Because of this, the pre-grouting at inside the tunnnel of depth 200m was executed. In this report, it is something which is reported concerning the result of the pre-grouting.

Oral presentation

Current status of Mizunami Underground Research Laboratory project; 4; Current status of the construction work of Mizunami Underground Research Laboratory

Mikake, Shinichiro; Yamamoto, Masaru; Ikeda, Koki; Kamia, Akira; Kinoshita, Harunobu; Ishida, Hideaki; Ishii, Yoji

no journal, , 

no abstracts in English

Oral presentation

Measurement of the rock strain/displacement during deep shaft excavation in crystalline rock

Hirano, Toru; Matsui, Hiroya; Kinoshita, Harunobu

no journal, , 

We tried to understand the amount of the total rock deformation and the feature by the strain/displacement measurement during a deep shaft excavation in crystalline rock. For this purpose, the instruments were installed in the vertical boreholes drilled along a shaft before excavation. Then strain/displacement were measured during the excavation. As a result, the large strain/displacement by blasting were measured at 1 or 6 meter far from the shaft wall, Also, the rock behavior was estimated to be elastic approximately based on comparison between measured and theoretical value. Also, damage range of the rock caused by blasting was estimated less 1 meter far from the shaft wall.

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