摘要
为解决高黎贡山大瑞铁路高地温深埋特长隧道高温热害问题,常采取通风降温与机械制冷降温相结合的措施。针对某一施工段,当通风降温能力到达限值仍无法使得隧道内空气温度满足规范时,需开启机械制冷设备。本文首先联立围岩与空气稳态传热方程和空气换热方程,利用隧道内壁面与空气换热第三类边界条件,求解出隧道内空气温度解析解。随后,以某一施工段出渣工序为例,迭代求解出隧道内不同回风速度和地下涌出热水散热功率下,施工隧道开挖面附近最高气温为28℃时的洞口临界大气温度。经计算发现,洞口临界大气温度与地下涌出热水散热功率负相关,与回风速度正相关;结合当地气象参数,量化单独采用通风就能使工作面附近气温满足规范要求的洞口大气温度变化区间,为进一步制定制冷设备运行计划提供理论依据。
It is normal practice to combine ventilation and mechanical cooling to solve the issue of heat damage in the high geothermal and deeply buried long tunnel of Darui Railway in Gaoligongshan.For a certain area under construction,when the ventilation cooling capacity reaches the limit and the air temperature in the tunnel cannot meet the specifications,mechanical refrigeration equipment must be turned on.Therefore,an axisymmetric two-dimensional heat conduction model of the surrounding rock combining radial and axial heat flow is derived,and an air heat exchange model is given.Analytical solutions of air temperature in tunnels are further deduced;also,the calculation results match well with the data measured in practice.The critical atmospheric temperature at the entrance is solved iteratively when the maximum air temperature near the excavation face is 28℃under different return air speeds and underground hot water heat dissipation power in the tunnel,considering the slagging process of a specific area under construction as an example.It was found that the critical temperature is negatively correlated with the heat-dissipated power of underground hot water and positively correlated with the return air velocity.Compared to the local meteorological conditions,one can obtain the change block of the ambient temperature at the entrance with ventilation cooling alone when the temperature near the working face meets the specification requirements and further develop the plan of refrigeration equipment operation.
作者
翟康博
童谣
王树刚
Zhai Kangbo;Tong Yao;Wang Shugang(China Railway Tunnel Consultants Co.,Ltd.,Guangzhou 511458,Guangdong,P.R.China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2023年第1期275-281,共7页
Chinese Journal of Underground Space and Engineering
基金
中铁隧道局集团资助项目(隧研合2016-01)。
关键词
施工隧道
空气温度
通风降温
机械降温
临界温度
construction tunnel
air temperature
ventilation cooling
mechanical cooling
critical temperature
