Abstract
To analyze heat effect in deep metal mines, it is crucial to understand the temperature field distribution around the mine tunnel. In this paper, a numerical model of the random mineral composition of the rock body is established based on finite element software to analyze the influence of the internal composition of the surrounding rock on the temperature field, and a numerical simulation model based on COMSOL finite element software is established based on the two heat exchange modes of heat conduction and heat convection in the surrounding rock. The results show that the numerical simulation results of a typical numerical simulation model using a single material are lower than the real situation; increasing the tunnel length does not increase the heat exchange efficiency between the rock wall and the air; increasing the wind velocity has a limited impact on the temperature field; the wind temperature more directly affects the mining surface; and the effect of wet air on the temperature field of the surrounding rock has a more substantial variation.
Highlights
Shallow mineral resources are becoming increasingly rare, and deep mining is attracting domestic and international attention [1, 2]. e current mining depth is expanding at a pace of 8–12 meters per year on average. e temperature of the subsurface rock layer rises with depth, having a 3°C/ 100 m average ground temperature differential. e Xiling mining section of the Shandong Sanshandao gold mine will reach a depth of more than 2000 meters, with temperatures reaching 60 degrees Celsius
Hot and humid conditions can affect the productivity of underground workers [3], which can lead to lower production. erefore, the climatic conditions in underground mines must remain safe
Xin et al [6] conducted numerical simulations on the effects of factors such as cross-sectional shape of the tunnel, rock surface roughness, and gas Reynolds number during excavation, and the study showed that the Reynolds number has the greatest effect on convective heat transfer coefficient and wall temperature
Summary
Shallow mineral resources are becoming increasingly rare, and deep mining is attracting domestic and international attention [1, 2]. e current mining depth is expanding at a pace of 8–12 meters per year on average. e temperature of the subsurface rock layer rises with depth, having a 3°C/ 100 m average ground temperature differential. e Xiling mining section of the Shandong Sanshandao gold mine will reach a depth of more than 2000 meters, with temperatures reaching 60 degrees Celsius. Zhou et al [7] used the transient heat transfer model coupled with convection and conduction to study the dynamic changes of the temperature field during the operation of the tunnel. Lu [8] established a three-dimensional numerical model of convective heat transfer using model test results and field data to verify the evaluation of factors affecting the temperature of the surrounding rock. By studying the periodic changes of the temperature field inside the surrounding rock, Heist[10], a German scholar, proposed the initial theory about the heat-regulating circle of the surrounding rock. Nottrot [11], a German scholar, described the temperature field of the heat-regulating circle of the surrounding rock using the numerical calculation method. Zhang [13] used the FISH language in FLAC3D3.0 to write a program to simulate the temperature field with and without seepage to compare and contrast, and the results showed that disregarding the effect of seepage would exaggerate the thickness of the freeze-thaw circle results
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