Abstract
Abstract To study the active heat insulation roadways of high-temperature mines considering thermal insulation and injection, a high-temperature −965 m return air roadway of Zhujidong Coal Mine (Anhui Province, China) is selected as a prototype. The ANSYS numerical simulation method is used for the sensitivity analysis of heat insulation grouting layers with different thermal conductivities and zone ranges and heat insulation spray layers with different thermal conductivities and thicknesses; thus, their effects on the heat-adjusting zone radius, surrounding rock temperature field, and wall temperature are studied. The results show that the tunneling head temperature of the Zhujidong Mine is >27°C all year round, consequently causing serious heat damage. The heat insulation circle formed by thermal insulation spraying and grouting can effectively alleviate the disturbance of roadway airflow to the surrounding rock temperature field, thereby significantly reducing the heat-adjusting zone radius and wall temperature. The decrease in the thermal conductivities of the grouting and spray layers, expansion of the grouting layer zone, and increase in the spray layer thickness help effectively reduce the heat-adjusting zone radius and wall temperature. This trend decreases significantly with the ventilation time. A sensitivity analysis shows that the use of spraying and grouting materials of low thermal conductivity for thermal insulation is a primary factor in determining the temperature field distribution, while the range of the grouting layer zone and the spray layer thickness are secondary factors. The influence of the increased surrounding rock radial depth and ventilation time is negligible. Thus, the application of thermal insulation spraying and grouting is essential for the thermal environment control of mine roadways. Furthermore, the research and development of new spraying and grouting materials with good thermal insulation capabilities should be considered.
Highlights
With increasing mining depth, high-temperature heat damage has become more evident
It can be concluded that an increase in the range of the grouting layer zone weakens the influence of the roadway airflow on the roadway surrounding rock temperature field; it is not as significant as reducing the thermal conductivity of the grouting layer
The temperature field of an active thermal insulation roadway was analyzed in detail in terms of the thermal insulation grouting and spray layers using the numerical test method
Summary
High-temperature heat damage has become more evident. This affects mine workers in terms of their physical and mental health and their work efficiency, necessitating thermal environment control of mines. In China, Li et al tested the heat insulation effect of glazed hollow bead thermal insulation mortar for a high-ground-temperature roadway [7]. In some of the mining areas in Shanxi and Henan Provinces, China, spray thermal insulation materials have been applied on the surface of high-ground-temperature roadways [12,13]. Most scholars discussed an active thermal insulation structure formed by a thermal insulation spray material and its influence on the roadway temperature field using numerical simulation methods. The ANSYS numerical simulation method was used to discuss the distribution regularity of the temperature field of the roadway surrounding rock under different thermal physical parameters of the grouting and spray insulation layers. The above results show that the mine thermal damage is severe and seriously affects the physical and mental health and work efficiency of miners [18]
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