Analysis of temperature variation of original rock mass in a high altitude and ultra-deep underground mine

In order to study the temperature variation of original rock mass in a high altitude and ultra-deep underground mine in Yunnan province, a temperature measurement method in shallow hole is used to determine the temperature of the original rock mass at the main deep mining level in the mine.The results show that the geographical location of the mine and the influence of fissure water, the 1 274 m and upper horizontal protoliths are in an endothermic state, and the original rock temperature and convective heat transfer coefficient increase with the increase of mining depth.The temperature of the original rock at 1 274 m is not much different from the temperature of the roadway, and the heat absorption is small.The 924 m level is less affected by the mining, so it is closer to the original surrounding rock structure and belongs to the exothermic source.In the subsequent deep mining process, attention should be paid to further control of heat damage.