UDC 614.841
The article discusses the problem of fire safety of underground structures, in particular those intended for the deep burial of radioactive waste. The authors hypothesize that the properties of the rock may change during fires in mining operations, which may affect their strength characteristics. The main purpose of the work is to identify changes in the internal structure of rock core samples under temperature conditions characteristic of fires in deep-laid underground structures. As an example of such a structure, an underground research laboratory is considered, which is planned to be located in the Krasnoyarsk Territory on the Yeniseisky site of the Nizhne-Kansky massif. It is proposed to use the results of numerical modeling of heat and mass transfer processes during a fire in an underground research laboratory to substantiate the temperature effects on core samples during field experiments to study the strength characteristics of the material. Based on the calculated model in the FDS format, a range of changes in the surface temperature of the structure's fences during a fire was revealed, which ranged from 300°C to 600°C. X-ray images of rock core samples from the Archean gneiss massif heated to the appropriate temperatures in increments of 100 °C. The data of x-ray phase analysis showed the presence in the samples of quartz (SiO2), albite (NaAlSi3O8), biotite (KMg2FeAlSi3O10(OH)) and other minerals, the intensity of peaks of which changes depending on the temperature of the samples. The results of the quantitative content of each of the identified minerals in the studied samples are graphically presented
fire, fire safety, underground research laboratory, core, mine workings, rocks, fire modeling, fds, x-ray phase analysis
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