空气隔热夹层围岩温度场数值计算及试验分析  

Simulation and experimental analysis for temperature field of roadway surrounding rock with air layer thermal insulation

作　　者：李文菁 邹声华[3] 杨万鑫[3] 胡琦 LI Wenjing;ZOU Shenghua;YANG Wanxin;HU Qi(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,411201 Xiangtan,China;Architectural Engineering College,Hunan Institute of Engineering,411004 Xiangtan,China;Civil Engineering College,Hunan University of Science and Technology,411201 Xiangtan,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湘潭411201 [2]湖南工程学院建筑工程学院,湘潭411004 [3]湖南科技大学土木工程学院,湘潭411201

出　　处：《应用力学学报》2022年第2期394-402,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51274098,51134005);湖南省教育资助项目(No.21B0660)。

摘　　要：随着矿产资源的开采深度日益增加,矿井高温热害问题日益突出,研究新的隔热技术、隔热工艺已经成为控制围岩传热的重要研究方向。鉴于空气夹层结构在建筑围护结构和寒区隧道中的保温隔热作用,提出应用封闭空气夹层控制巷道围岩散热量的方法。采用ANSYS Fluent软件求解了含空气夹层的围岩温度场分布。通过相似理论设计了含空气夹层的巷道围岩温度场测试试验台,并应用试验结果对数值计算结果进行了验证,两者具有很好的吻合性,证明了ANSYS Fluent模拟结果的正确性。应用计算模拟结果和试验结果分析了围岩内温度场非稳态传热过程中的变化规律,发现因空气夹层内自然对流现象的存在,顶部、中部和底部围岩温度场发展并不一致,但其调温圈无因次半径均小于无隔热巷道。并通过实例计算研究,发现空气层厚度对围岩散热量影响较小,空气夹层厚度从2 cm增加到20 cm时,围岩单位长度散热量仅下降5%;围岩导热系数对空气夹层隔热率有着显著的影响,导热系数为0.59 W/(m·K)比围岩导热系数6.18 W/(m·K)时夹层隔热率衰减速率快。封闭空气夹层隔热结构适用于新掘进巷道或高温隧道的临时性隔热或围岩导热系数高的固定或半固定作业地点的永久性隔热。With the increasing mining depth of mineral resources,the problem of thermal hazard in high temperature underground space is increasingly serious.The research on new heat insulation technology and heat insulation technology has become an important research direction to control the heat transfer of surrounding rock.Based on the effect of air layers on heat insulation in building envelope and tunnel,the method of applying enclosed air layer to control the heat dissipation of surrounding rock is proposed.The temperature field distribution of surrounding rock with air layer is solved by ANSYS Fluent software.Based on the similarity theory,an experimental platform for the temperature field of roadway surrounding rock with air layer was designed.The numerical results were verified by the experimental results,which showed that the two results were in good agreement.So,the simulation results of ANSYS Fluent are reliable.Base on experimental results and the simulation results the variation law of the temperature field in surrounding rock in unsteady heat transfer is analyzed.It is found that the temperature field at the top,middle and bottom of the surrounding rock is different because of the existence of natural convection in the air layer,and the dimensionless radius of the temperature regulating ring is less than that of the normal roadway.The influence of the thickness of air interlayer on the heat release of surrounding rock is studied by example calculation.It is found that the thickness of air layer has little effect on heat loss of surrounding rock.When the thickness of small air layer increases from 2 cm to 20 cm,the heat loss per unit length of surrounding rock only decreases by 5%.The thermal conductivity of surrounding rock has a significant influence on the thermal insulation rate of air interlayer,the decay rate of the heat dissipation of the thermal conductivity of 0.59 W/(m·K)is faster than that of 6.18 W/(m·K).The enclosed air layer insulation structure is suitable for temporary insulation of new tunnel

关 键 词：围岩散热 隔热技术 空气夹层 非稳态传热 围岩温度场 

分 类 号：TD727[矿业工程—矿井通风与安全]