基于高地温隧道热流耦合温度场的数值模拟研究

Research on Numerical Simulation of Coupled Temperature Field Based on Heat Flow of High Geothermal Tunnel

以实际工程为依托,结合能量传输方程,考虑流场和温度场的相互影响,建立三维隧道热流耦合模型,应用Fluent计算软件,在实际监测数据验证的基础上,对隧道施工过程中的通风降温问题进行分析研究。结果表明:通风温度、通风风速和通风管与工作面距离均对通风降温的效果造成一定影响,其中通风温度的影响最大;当通风温度越低、通风风速越大、通风管距离工作面越近时,隧洞内的空气温度环境越好,降温效果越明显;在选定的工况中,最高降温为24.4℃,最低降温为7.1℃;通风温度为5℃和10℃的工况中,主要工作活动范围区域内(距离工作面100 m范围内)的平均空气温度值能够满足小于28℃的要求。

Based on the actual project,the three-dimensional coupled model for heat flow oftunnel is established by combining with the energy transfer equation and considering the interaction between the flow field and the temperature field.On the basis of the verification of the actual monitoring data,the ventilation and cooling problems in the tunnel construction process are analyzed and studied by using the Fluent calculation software.The results show that:the ventilation temperature,ventilation velocity and the distance between the ventilation pipe and the working face all have certain impact on the ventilation and cooling effect,and the ventilation temperature has the greatest impact;when the ventilation temperature is lower,the ventilation velocity is higher,and when the ventilation pipe is closer to the working face,the air temperature environment in the tunnel is better,and the cooling effect is more obvious;the maximum temperature drop is 24.4℃,and the minimum temperature drop is 7.1℃in the selected working condition;when the ventilation temperature is respectively 5℃and 10℃,the average air temperature within the main working activity area(within 100m from the working face)can meet the requirement of less than 28℃.