抄録
Almost all the mining areas of Toyoha Mine are in hot rock and the areas in initial rock temperatures greater than 373K are not a few. Especially, the initial temperature of the new deposit which is recently discovered and named Shinano Vein partly reachs 433K.
In order to perform effective expansion of ventilation system for development of Shinano Vein under such condition, the authors carried out numerical analyses for prediction of underground climate. They set their main aim that they can decrease the inlet air temperatures of the airways going to the deposit as much as possible. They carried out prediction calculations for the models corresponding to current ventilation network and also carried out in-situ measurement of underground climate in the current condition, and they adjusted the values of the airway parameters so as to fit the calculated distributions of temperature, humidity and rate of flow in main frame come near to the measured ones. Then, they set up several plans for expansion of ventilation system, which can be performed in consideration of initial condition of rock and economical effect, and they determined the most suitable plan from the viewpoint of underground cooling by comparison of the temperatures, humidities and rates of flow, which are calculated from the planned models.
