Rock mechanics stability analysis of shafts and research galleries at the Mizunami Underground Research Laboratory; Japanese fiscal year, 2005 (Contract research)

Shibuya, Hitoshi*; Suzuki, Takashi*; Kuroda, Hidetaka

The soundness of the design of the support system for shafts and galleries and the effects of pre- and post-excavation grouting have been assessed to confirm the proposed technical solutions at the Mizunami Underground Research Laboratory. For this purpose, design of the shafts above 1,000 m depth and the galleries above 500 m depth has been improved and grouting effects around the shafts has been calculated by means of seepage flow analysis. Additionally, analytical investigations on the concrete lining with respect to the influence of water pressure have been performed.