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冰川冻土 ›› 2014, Vol. 36 ›› Issue (4): 836-844.doi: 10.7522/j.issn.1000-0240.2014.0100

• 冻土地区工程建设 • 上一篇    下一篇

季节冻土区埋地管道水温的变化规律及其影响因素分析

陈继1, 李昆2, 盛煜1, 冯子亮1   

  1. 1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;
    2. 中国科学院 成都山地灾害与环境研究所, 四川 成都 610041
  • 收稿日期:2014-03-06 修回日期:2014-06-02 出版日期:2014-08-25 发布日期:2014-08-23
  • 作者简介:陈继(1977-),男,河南永城人,副研究员,2007年在中国科学院寒区旱区环境与工程研究所获博士学位,现主要从事冻土工程与环境方面的研究工作.E-mail:chenji@lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(41101065) 资助

Variations and influencing factors of the water temperature within the pipe buried in seasonally frozen ground areas

CHEN Ji1, LI Kun2, SHENG Yu1, FENG Ziliang1   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
  • Received:2014-03-06 Revised:2014-06-02 Online:2014-08-25 Published:2014-08-23

摘要: 埋地管道是减少寒冷地区冬季冻害的常用铺设方式,深入认识埋地管道的水温变化规律可以为减小管道埋设深度、降低管道冻害提供理论依据,对当前季节冻土区农牧民集中式供水工程的推进具有指导意义. 采用仿三维数值方法建立了管道水温的计算模型,讨论了含水量、地表温度、管道埋深等6个主要因素对埋地管道最不利水温的影响. 分析结果表明,无论上述因素如何变化,管道最不利水温均随输送距离的增加而下降. 首先,随着含水量的增加、地表温度的升高以及管道埋深的加深,管道的降温速率不断减小并具有先快后慢的特点;其次,随着管径的减小、流速的降低,管道降温速率增大,且降温速率和流速之间具有近似的倒数关系. 另外,随着入口温度的升高,管道降温速率将呈指数形式不断增加.

关键词: 季节冻土区, 埋地管道, 最不利水温, 降温速率, 仿三维数值方法

Abstract: To bury a pipe is a common technique to keep running water warm in the winter. Integral knowledge of water temperature within a buried pipe can provide theoretical basis for decreasing burial depth and keeping water warmer. Also, it has practical significance for popularizing of central water supply engineering. On the basis of quasi-three dimensional numerical method, the effect of soil moister, ground surface temperature, buried depth, pipe diameter, water flow velocity and inlet water temperature when the pipe temperature at lowest are discussed in this thesis. No matter how the above factors change, the water temperature will go down with the conveying distance. The cooling rate of pipe decreases quickly firstly, then slowly with increasing of soil moister and burial depth and rising of ground temperature. When the pipe is buried below the frost line, effect of seasonally frozen soil layer on pipe can be ignored. With decreasing of pipe diameter and water flow velocity, the cooling rate will increase. Water flow velocity has a reciprocal relationship with the cooling rate. Additionally, the pipe cooling rate increases exponentially with the rising of inlet temperature.

Key words: seasonally frozen ground areas, buried pipe, most unfavorable water temperature, cooling rate, quasi-three dimensional numerical method

中图分类号: 

  • TU990.3