地下近邻平行精密恒温隧道间传热的模拟研究

Simulation study on heat transfer between underground adjacent parallel precision constant temperature tunnels

针对某大科学工程地下3条近邻隧道运行时的隧道间传热进行了研究,分析了单条运行、2条运行及3条同时运行模式下隧道围护结构热流密度和周围土壤温度场的差异。结果表明:各运行模式下,初始第1个月内热流密度下降最快,可达90%以上;不同运行模式下6个月后隧道间传热开始出现明显差异,最大值是最小值的115%,而不同模式运行10年后,最大值是最小值的268%;当隧道运行数量和运行顺序不同时,热流密度衰减不同,隧道运行数量越多、距离越近,相互影响就越大,且围护结构热流密度越低。

The heat transfer between tunnels during the operation of three adjacent tunnels in a large scientific project is studied,and the differences in heat flux density of tunnel envelopes and surrounding soil temperature field under single tunnel operation,two tunnel operation and three tunnel simultaneous operation modes are analysed.The results show that the heat flux density under all operation modes drops significantly in the first month,which can reach more than 90%.The heat flux density under different operation modes exhibits significant differences after six months,the maximum value is about 115%of the minimum value,and the maximum heat flux density can reach 268%of the minimum value after 10 years.When the number and sequence of tunnels in operation are different,the heat flux density attenuation is different.The more the number of tunnels in operation and the closer the distance,the greater the mutual influence,and the lower the heat flux density of the envelopes.