安房トンネル予定地周辺の3次元熱的構造

概要

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The thermal structures of the Nakanoyu geothermal area, Nagano and its vicinity are considered quantitatively. The Nakanoyu area is located in the south-eastern foot of an active volcano, Mt. Yakedake. In order to improve traffic in the Abo mountain pass which is closed for six months by heavy snow in winter and sometimes is closed by rockfalls and landslides, the Ministry of Construction has planned to construct a long tunnel there. As the route is near the summit dome of the Yakedake volcano, the temperatures within the tunnel may become extremely high. We, therefore, have to research the detailed 3-D subsurface temperature distribution of the Nakanoyu area and its vicinity. Numerical simulations were carried out to calculate the 3-D subsurface temperature distribution from the 1 m-depth ground temperatures and the measured temperatures within deep boreholes as boundary conditions. The computed results indicate that the subsurface temperatures are quite high in the region near the Nakanoyu hot spa, which becomes about 160℃ in the maximum at 1330 m altitude. With the increase in altitude, the computed subsurface temperature becomes low in general. These calculation results are quite consistent with the measured values within the new gallery which was drived after our theoretical research.
特定非営利活動法人日本火山学会の論文
1986-12-26