低温熱環境下における岩盤の温度分布特性 : 釜石鉱山における岩盤凍結融解試験

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A large scale in-situ freezing and thawing test was carried out in a tunnel of the Kamaishi Mine to understand the conduction of heat in a fractured rock mass. Nine freezing pipes of 2.5 m log were installed in nine boreholes drilled from the tunnel floor. The brine liquid was circulated through those pipes in order to freeze the rock mass of the test site. The temperature of the brine was fixed at -20°C and the circulation of the brine liquid was continued for 7〜10 days in each freezing process. Thawing process was conducted by stopping the circulation after each freezing process. The duration of thawing process was about 1 month. The transient change of the temperature around those pipes was continuously measured in 23 observation holes at depths of 1 m, 2 m, 3 m, respectively. The temperature distributions around the freezing pipes were calculated by three dimensional finite element analysis using homogeneous continuum assumptions. The latent heat of water, contained in the rock mass and the heat transfer from the tunnel floor were taken into account in the analysis. The calculated temperature changes were compared with the measured ones. The conclusions obtained are summarized as follows. (1) The change of the temperature is influenced considerably by the latent heat of water when a phase change of water occurred in the rock mass. (2) Thickness of thermal boundary layer, induced by heat transfer from the tunnel floor, is evaluated as 1〜3 cm in the analysis. (3) The temperature distributions in the fractured rock mass can be estimated by the assumption that the rock mass is homogeneous continuum.
一般社団法人日本応用地質学会の論文
1996-06-10

低温熱環境下における岩盤の温度分布特性 : 釜石鉱山における岩盤凍結融解試験

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