热害矿井巷道围岩冷水截流降温技术

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

为了缓解矿井热害问题,提出了向巷道围岩中置入冷水管,通过冷水管截流高温的方法来降低围岩温度。根据相似性原理搭建了高温围岩冷水截流降温实验系统,改变冷水流速、通入时长和围岩温度等进行实验;结合COMSOL模拟分析了冷水管不同管径、不同间距布局对巷道围岩冷水截流降温效果的影响。结果表明:其他条件不变时,围岩降温幅度随着冷水流速,通入时长以及围岩与冷水的温差的增大而增大;模拟实际巷道围岩冷水截流降温,在冷水管管径为10 cm,竖直方向间距为2.5 m时,降温后巷道壁面的平均温度为23.4℃。

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℃.