关于多年冻土区热管冷却半径的探讨

Discussion on Cooling Radius of Heat Pipes in Permafrost Area

随着工程建设标准的提高及全球气候的增温,热管降温措施在近十余年来被广泛应用于多年冻土区的铁路、公路等工程中。冷却半径作为反映热管措施效果的关键指标,在理论和实践上给予了大量研究,基本掌握了影响热管冷却半径的大致范围。但是由于工程地质条件的复杂性、热管结构参数的多样性、年平均气温的差异性,以及评价季节的差异,对热管冷却半径的认识还有一定差异。同时,当前关于热管冷却半径的评价,多侧重于冬季,且评价标准不明确。采用热管措施的出发点是提高地基的承载力,下一步关于热管冷却半径的研究需要从最不利的季节入手,并结合地温和承载力的关系,进一步明确多年冻土区热管冷却半径的评价标准。

With the rise of construction criterion and the global warming,heat pipes have been widely used in the railway,highway and other infrastructure engineering in the recent more than ten years.As a key index that represents the cooling effect of heat pipes,cooling radius was studied deeply and extensively in theory and practice.Approximate cooling radius and its influencing factors are given.Owing to the complexity of engineering geological conditions,variability of air mean temperature,diversity of heat pipe structure parameter,and seasonal difference of evaluation result,there are slight difference for the cooling radius.Additionally,analysis on the cooling radius of heat pipes are mainly based on the cold season data,and its evaluation criteria are not definite.Enhancing the bearing capacity of foundation is the final aim of heat pipe measure.Cooling radius in unfavorable season should be emphasized in the next.Furthermore,evaluation criteria of cooling radius with consideration of ground temperature and bearing capacity's relationship are necessarily to be given as soon as possible.