TY - JOUR
TI - Heat transfer analysis of surrounding rocks with thermal insulation layer in high geothermal roadway
AU - Zhang Yuan
AU - Wan Zhijun
AU - Ma Zhaoyang
AU - Gu Bin
AU - Ma Yangsheng
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 777
EP - 790
PT - Article
AB - A mathematical model of heat conduction in surrounding rocks of the high  geothermal roadway with thermal insulation layer was established in this  paper, and its finite difference scheme was also proposed. On this basis,  thermal insulation mechanism of thermal insulation layer was investigated.  Results show that distinct regional temperature distribution exists in the  thermal insulation layer; the temperature is continuous while the  temperature gradient has a sudden fluctuation at the interface of different  media. The wall temperature is lower and the inner surrounding rock  temperature is higher in surrounding rocks with thermal insulation layer  compared to that in surrounding rocks without thermal insulation layer.  Moreover, the smaller the thermal conductivity of the medium in the thermal  insulation layer, the larger the temperature gradient and the smaller the  heat flux density. At the beginning of ventilation, thermal insulation of  the gunite layer is better than that of the grouting layer. After three  months, thermal insulation of the grouting layer is better than that of the  gunite layer. Thermal insulation layer can reduce 29-40 percent of heat  dissipation and the thermal insulation would be more significant if the  thermal insulation layer was constructed earlier.