Cold water interception cooling technology for surrounding rock of heat-damaged mine

Abstract

In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.

Keywords

• mine heat damage
• mine cooling
• high temperature surrounding rock
• cold water interception
• numerical simulation