Simulation study on heat insulation and cooling of deep shaft tunnel with different heat insulation materials
To solve the problem of heat damage caused by the continuous extension of coal mining depth,and to reveal the distribution characteristics of the temperature field in the deep-shaft roadway,five kinds of mining thermal insulation materials were selected to carry out the study of thermal insulation and cooling in the deep-shaft roadway,to analyze the effects of different thicknesses of the thermal insulation layer and different initial temperatures of the peripheral rock on the temperature field of the peripheral rock,the radius of the heat-regulating circle,and the temperature change of the wind flow in the roadway,and to analyze the evolution characteristics of the peripheral rock temperature field in the vicinity of the thermal insulation layer.The results show that foam heat-insulating concrete has the best heat-insulating performance and the lowest economic cost.The selection of lower thermal conductivity of the insulation layer helps to improve the thermal insulation effect of the insulation layer,and 5-10 cm is the best thickness of insulation layer,temperature field is consistent with the spatial distribution of peripheral rock layer,anchor spraying layer,and insulation layer,thermal conductivity of insulation material is negatively correlated with the tunnel peripheral rock temperature gradient,thickness of insulation layer,and temperature of the original rock are positively correlated with the tunnel peripheral rock temperature gradient,and thickness and temperature of insulation layer have a significant influence on radius of heat-regulating circle.Temperature has a certain degree of influence on radius of heat-regulating circle,compared with the roadway without a heat-insulating layer,roadway heat-insulating effect of cooling effect is significant.
insulation materialstunnel airflowtemperature field of surrounding rocktemperature gradientheat regulating ringthermal insulation effect
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