The thermal condition of the mines in cryolite zone
- Ph.D., Dr.Sci. professor Saint-Petersburg Mining University
Abstract
Are given the results of the qualitative and quantitative analysis of the formation of the thermal condition of the contemporary mechanized mines in cryolite zone. Are established basic laws governing the formation of thermal condition in workings of mine and their surrounding rocks during the annual cycle. The estimation of the hardness of microclimate with the operation of mine without the regulation of thermal condition is made. It was established that for most existing and planned mines in permafrost areas the gravity of microclimate during the cold period of the year exceeds the maximum permissible values along the whole length of the ventilation path. This can cause a significant increase in occurrence of cold-like occupational diseases in the workers. It is shown that the part of the productions of mine, with the operation under the conditions of the uncontrolled thermal condition, does not answer the criterion of safety with the appearance of extraordinary situations. In particular, it is connected with that the standard self-rescuers commonly used in the mines have the lowest operating temperature not less than -20 0С. During the cold period of the year the air temperature in most workings is lower than this value. In accordance with the results of research an algorithm for prognosis and assessment of parameters of heat regime of mines which would allow to secure a safe exploitation of the mine during both normal operating conditions and in cases of emergency situations.
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