Numerous studies have been made to control the climate conditions in underground mines, but most of them are concentrated on a single roadway with through airflow, and those on the simulation of heat problems in developing roadway with local ventilation are very few. Therefore it is necessary to establish a proper method to simulate the thermal environmental conditions within the working face with auxiliary ventilation for controlling the thermal climate there effectively.As a basic study on control of the thermal environment in working face with auxiliary ventilation, the CFD method is employed to simulate the transfer of heat and moisture between rock surface and the airflow at a heading face with forcing auxiliary ventilation. Based on the simulation results, the distribution of local heat-transfer coefficient and its relationship with airflow rate, variation of heat transfer flux from the strata to the ventilation air with time and wetness fraction, the distribution of rock temperature and its variation with time elapse are discussed in the paper.The study provides an important basis for establishing a proper method to predict the thermal environment conditions on locally ventilated working places.

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A mine fire generates toxic gases and influences airflow in the mine ventilation network. Therefore, the knowledge of the effect of the mine fire on the network and the gas distribution in the roadways is indispensable for the management of escape, rescue and fire fighting activities. The ventilation network analysis during a mine fire will be one of the useful tools for these purposes. Also it is expected to give significant information to perform effectively mine ventilation control during a mine fire.The authors developed a computer program to simulate airflow changes and gas concentration in a network during a mine fire. The program introduces the "ventilation pressure created by a fire (natural draft effect)" and the "throttling effect" into the analysis. The performance of the program has been investigated, using the data of actual mine ventilation network data and of a fire experiment in the Experimental mine. The program is proved to give useful results to make effective countermeasures to mine fire and to make effective education about mine fires for the people who work in underground. KEY WORDS : Mine Fire, Subsurface Fire , Ventilation Network Analysis, Ventilation Changes