Abstract
Thermal insulation gunite (TIG) in roadways is an effective method for regional thermal hazard control in mines. The development of mine TIG materials is the foundation of thermal insulation technique. However, some conventional and advanced insulation materials are inapplicable to deep mines which are rather humid with high in situ stress and high geo-temperature. In this study, a kind of fly ash-inorganic mineral TIG material was developed and applied to the modelling of a high geo-temperature roadway. Moreover, the thermal insulation effect of the TIG layer was analyzed, and the temperature field characteristics of the TIG surrounding rock were discussed. Results reveal that (1) the TIG layer has a significant impact on the heat release of the wall and stability of the surrounding rock temperature field; (2) the initial temperature disturbance times, temperature disturbance ranges, and temperature drop rates differ with whether a TIG layer exists or not; (3) after the TIG roadway starts to be ventilated, the thermal flux densities tend to be consistent, which indicates the end of temperature disturbance; besides, the dimensionless temperature shares an exponential relation with the dimensionless radius; and (4) the characteristics of temperature drops vary with the radial positions of the surrounding rock. The research results provide a certain reference for thermal hazard control, temperature prediction, and ventilation network adjustment.
Highlights
Junhui Wang,1 Zhijun Wan,1 Hongwei Zhang,2 Dong Wu,1 Yuan Zhang,1 Yi Wang,3 Luchang Xiong,1 and Guoli Wang4
Results reveal that (1) the TIG layer has a significant impact on the heat release of the wall and stability of the surrounding rock temperature field; (2) the initial temperature disturbance times, temperature disturbance ranges, and temperature drop rates differ with whether a TIG layer exists or not; (3) after the TIG roadway starts to be ventilated, the thermal flux densities tend to be consistent, which indicates the end of temperature disturbance; besides, the dimensionless temperature shares an exponential relation with the dimensionless radius; and (4) the characteristics of temperature drops vary with the radial positions of the surrounding rock. e research results provide a certain reference for thermal hazard control, temperature prediction, and ventilation network adjustment
A kind of mine TIG material that boasts light weight, thermal insulation, and large load-bearing capacity was developed by taking cement, sand, fly ash, and vitrified microsphere as raw materials and density, thermal conductivity, and uniaxial compressive strength (UCS) as evaluation indexes
Summary
Junhui Wang ,1 Zhijun Wan ,1 Hongwei Zhang ,2 Dong Wu, Yuan Zhang, Yi Wang, Luchang Xiong, and Guoli Wang. Academic Editor: Zhiqiang Yin ermal insulation gunite (TIG) in roadways is an effective method for regional thermal hazard control in mines. E problem of thermal hazards appeared earlier in developed mining countries such as the United States [4], Australia [5], Poland [6], and South Africa [7]. To this day, there have been about 140 high geo-temperature mines in China [8, 9]. Erefore, the research on the thermal insulation and cooling of roadways is of great significance for the control of regional thermal hazards and the efficient exploitation of resources in mines Advances in Civil Engineering cooling bring considerable burden to enterprises. e thermal insulation and cooling of a roadway is to shoot the mine thermal insulation materials on the roadway surface with high surrounding rock temperature, so as to reduce heat transfer from high-temperature rock to air flow. is method, in combination with the adjustment of ventilation parameters, can achieve a good cooling effect with a relatively low cost [9]. erefore, the research on the thermal insulation and cooling of roadways is of great significance for the control of regional thermal hazards and the efficient exploitation of resources in mines
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