高温矿井主动隔热巷道围岩温度场分布规律研究

摘要

In order to study the thermal insulation layer of the mine roadway affected to the temperature field of the surrounding rock,according to the energy conservation law and the heat dissipation characteristics of the surrounding rock,an one dimension unsteady heat conduction control equation of the composite medium was established and a computer program was prepared to simulate the temperature field of the surrounding rock in the mine active thermal insulated roadway.The thermal insulation layer affected to the temperature field distribution law of the surrounding rock was calculated and obtained.The study results showed that the thermal insulated layer could slow down the heat dissipation of the surrounding rock to the air flow with the internal temperature gradient changed in the surrounding rock.When the thermal insulated layer was applied,the temperature of the wall surface would be obviously reduced and the temperature distribution of the surrounding rock would have the features of the low temperature of the wall surface and high internal temperature.The radius of the temperature regulated ring in the surrounding rock and the thermal dissipation volume wholly would be in a right power index relationship to the ventilation time.With the thickness of the thermal insulated layer increased,the wall surface temperature of the mine roadway and the thermal dissipation of the surrounding rock would be individually reduced in an index and the power index relationship.The heat dissipation of the surrounding rock reduced with the established thermal insulated layer could be in a negative power index relationship to the thermal conductivity of the thermal insulated layer.An understanding of the thermal insulation mechanism to mine roadway was studied and deepened and would have a certain guidance role to the site application.%为研究矿井巷道隔热层对围岩温度场的影响,根据能量守恒定律和围岩散热的特点,建立了复合介质中的一维非稳态导热控制方程,编制了模拟主动隔热巷道围岩温度场的计算机程序,解算得出隔热层对围岩温度场分布规律的影响.研究结果表明:隔热层通过改变围岩内部的温度梯度来减缓围岩向风流的散热;有隔热层时壁面温度明显降低,围岩温度分布整体呈现出壁面温度低、内部温度高的特征;围岩调热圈半径和散热量与通风时间呈正幂指数关系;随着隔热层厚度的增加,巷道壁面温度和围岩散热量分别呈指数和幂指数关系减小;构建隔热层减少的围岩散热量与隔热层的导热系数呈负幂指数关系;研究加深了对巷道隔热机理的认识,对现场应用有一定的指导作用.