Study of the formation of thermal regimes in deep mines

Kazakov, B. P.; Zaitsev, Artem

doi:10.15593/2224-9923/2014.10.9

Вестник ПНИПУ. Геология. Нефтегазовое и горное дело

2014

DOI: 10.15593/2224-9923/2014.10.9

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Study of the formation of thermal regimes in deep mines

B. P. Kazakov¹,

Artem Zaitsev²

Abstract: Горный институт Уральского отделения Российской академии наук, Пермь, Россия Рассмотрена тема формирования теплового режима горных выработок глубоких рудников, являющаяся актуальной в связи с современной тенденцией углубления горных работ и возникновением трудностей нормализации микроклимата в горных выработках глубоких рудников. Цельисследование теплофизических процессов, протекающих в рудничной атмосфере и породном массиве, и их влияния на формирование микроклиматических параметров воздуха в горных выработка… Show more

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Absolute heat sources as a method to check the accuracy of temperature prediction in underground structures within cryolithozone

Galkin,

Pankov

2023

Min.Sci.Technol. (RUS)

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Forecasting the thermal regime of mine workings and the surrounding rock mass is a necessary element of the design of underground structures in cryolithic zone. This is particularly necessary when substantiating and selecting reliable methods and means of rock supporting, in order to ensure safe operation of underground structures during the entire standard service life. Changes in the temperature of discontinuous permafrost rocks in the range of negative values (below the ice point in the rock) can lead to a decrease in their strength characteristics, and consequently to a decrease in the stability of workings. The aim of the research was to compare two ways of considering absolute heat sources (point sources and sources uniformly distributed along the length of a mine working) when forecasting the thermal regime in mine workings of underground structures. The dependencies used to determine temperature differences in various methods of considering absolute heat sources were established. For the sake of generality, the dependencies were produced in dimensionless (criterial) form. The variants were calculated, and the results are presented in the form of graphs. The aim is to visually present the influence of the method of heat sources when considering the accuracy of air temperature prediction in an underground facility. Key qualitative and quantitative features of the formation of thermal regime in workings at different methods of considering absolute heat sources were established. It was shown in particular that during the transition from a negative temperature in a working to a positive one, incorrect consideration of the action of absolute heat sources can lead to an almost 30 % (1.26 times) difference (i.e., error) in the calculated depth of thawing of discontinuous rocks. It was also established that at a positive temperature, when the initial air temperature in a structure is more than 7.5 oC, there is no fundamental difference in engineering calculations results depending on the method of considering of absolute heat sources.

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Absolute heat sources as a method to check the accuracy of temperature prediction in underground structures within cryolithozone

Galkin,

Pankov

2023

Min.Sci.Technol. (RUS)

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Temperature Change in the Chambers of Underground Structures when operating Diesel Units

Galkin¹,

Pankov²,

Fedorov³

2022

Вопросы Безопасности

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The thermal regime of underground cryolithozone structures for various purposes, both related and not related to mining production, is an important factor determining their reliable and safe operation. In this regard, the forecast of the thermal regime in mine workings is a mandatory and important element in the justification of design solutions for the construction and reconstruction of underground structures in the areas of distribution of continuous and island permafrost. One of the main sources of heat generation in the workings is the work of diesel equipment, which is widely used, both in the development of mineral deposits by the underground method, and to ensure technological processes in underground structures of non-mining profile. The purpose of the research was to quantitatively assess the effect of diesel installations on the thermal regime in the underground structures of the cryolithozone. The results of numerical calculations are presented in the form of 2D and 3D graphs, which allow you to visually assess the effect of diesel equipment on the increment of air temperature in the underground structure, depending on the time of year and the efficiency of the diesel installation. It is shown, in particular, that in the most probable range of changes in the efficiency of a diesel installation, the air temperature can vary from 3.2 to 6.3 °C, depending on the standard values of the ventilation air flow. It is established that the temperature increment does not depend on the number of simultaneously operating diesel units and is determined only by the specific standard air flow (m3 / s per 1 kW of installation power).

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Study of the formation of thermal regimes in deep mines

Cited by 2 publications

References 0 publications

Absolute heat sources as a method to check the accuracy of temperature prediction in underground structures within cryolithozone

Absolute heat sources as a method to check the accuracy of temperature prediction in underground structures within cryolithozone

Temperature Change in the Chambers of Underground Structures when operating Diesel Units

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